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CN107302180B - Judge automatically and set the control method of laser frequency and power - Google Patents

Judge automatically and set the control method of laser frequency and power Download PDF

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Publication number
CN107302180B
CN107302180B CN201710442622.3A CN201710442622A CN107302180B CN 107302180 B CN107302180 B CN 107302180B CN 201710442622 A CN201710442622 A CN 201710442622A CN 107302180 B CN107302180 B CN 107302180B
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laser
frequency
main
output
power
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CN107302180A (en
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熊炜
张胤
王平俊
陈徐宗
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Peking University
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Peking University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/1305—Feedback control systems

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Automation & Control Theory (AREA)
  • Semiconductor Lasers (AREA)
  • Lasers (AREA)

Abstract

The invention discloses a kind of control systems and its control method for judging automatically and setting laser frequency and power.The present invention uses twin-laser structure, and main control unit can search for automatically according to spectral signal and judge automatically the output frequency of main laser, and after the output power to target power of Automatic Optimal main laser, frequency is automatically become locked on atom or molecular spectrum；Beat signal is generated after closing beam from the output of laser and main laser, main control unit can judge automatically the size relation of main laser and the output frequency from laser, to accurate and judge automatically output frequency from laser, after output power to target power of the Automatic Optimal from laser, frequency locking error signal is generated using main control unit, is realized within the scope of 80GHz to the locking from laser frequency；Method of the invention can be widely used in laser cooling, atomic frequency standard, the basic research such as atomic interferometer and laser wavelength meter and Technology of Precision Measurement field.

Description

Judge automatically and set the control method of laser frequency and power
Technical field
The invention belongs to photoelectron technical fields, and in particular to a kind of control for judging automatically and setting laser frequency and power System and its control method processed.
Background technique
In the device of the relevant precision measurement equipment of Frequency Stabilized Lasers and application high freuqency accuracy laser, it usually needs The output frequency of laser is tuned and locked in larger range.The relatively macrorelief of the aging of laser, parameter drift or working environment Meeting is so that laser frequency drift goes out system lock range, so that the failure or index decline of equipment are caused, if laser has There is the function of judging automatically simultaneously automatic setpoint frequency, the mean free error time will be substantially increased the index of equipment.
In general, in frequency stabilized carbon dioxide laser or applying in the device of high freuqency accuracy laser, need in larger model It encloses interior tuning and locks laser frequency.Common method is first to be controlled laser temperature in certain fixation using control temperature unit Within the scope of (by taking semiconductor laser as an example, the uncertainty general control of temperature is in milli Kelvin/1 hour, corresponding laser The uncertainty of frequency is 20MHz magnitude), the Injection Current of laser is then adjusted again, so that laser frequency and certain sample (example Such as atomic air chamber, molecule gas chamber or optical resonator etc.) resonance, detect and handle the spectral signal acquisition error letter that resonance generates Number, error signal control laser frequency (electric current of controllable laser, resonant cavity length or laser temperature) is recycled, realizes and swashs The locking (can usually be controlled the uncertainty of laser frequency in 1MHz magnitude after locking) of light frequency.
It being made reference using atom or molecular spectrum, laser frequency can only be locked on the discrete frequency values of several fixations, If the resonant frequency of required laser frequency and spectral line is inconsistent, need using complicated external modulation device (such as acousto-optic Modulation or Electro-optical Modulation etc.) laser frequency is adjusted, and external modulation device not necessarily being capable of seamless coverage atom or molecule All frequencies between spectral resonance frequency.It is made reference using optical resonator, if the optical path difference between resonator mirror is constant, Laser frequency can only be also locked on the discrete frequency values of several fixations；If cavity length can be tuned, adjust Humorous precision will have a direct impact on the precision of output laser frequency.In addition, the length of resonant cavity is highly susceptible to environment various factors Interference (such as variation of ambient temperature, humidity variation, mechanical oscillation etc.), these interference meetings are so that the resonance frequency of chamber occurs Drift, to influence the output frequency of laser.
When aging meeting is so that laser under the conditions of preliminary set time, reaches the output frequency of system needs, output light Power decline, generation measuring signal intensity decline so that whole device index decline even fail；Laser parameter becomes When change or environmental condition are had compared with macrorelief, laser can not be by adjusting Injection Current for laser frequency under original set temperature Rate, which is adjusted to target value or laser temperature, may not be able to be locked into original setting value, and such equipment can not work normally.
Summary of the invention
In order to solve above-mentioned problems of the prior art, is judged automatically the invention proposes one kind and set laser frequency The control system and its control method of rate and power can be judged automatically and be locked under the premise of laser itself is without failing Laser frequency is determined to target value.
An object of the present invention is to provide a kind of control systems for judging automatically and setting laser frequency and power.
The of the invention control system for judging automatically and setting laser frequency and power include: main laser, from laser, First control temperature unit, the second control temperature unit, the first current unit, the second current unit, the first power detector, the second power are visited Survey device, saturation-absorption spectrum unit, frequency stabilization unit, high-speed photodetector, frequency divider, the first high reflection light splitting piece, second high Reflection beam splitting piece, highly transmissive light splitting piece, the first half wave plate, the second half wave plate, quarter-wave plate, first are partially Shake beam splitter prism, the second polarization beam splitter prism and programmable logic device (CPLD)；Wherein, programmable logic device is by temperature and electricity The parameter of stream is transmitted to the first control temperature unit and the first current unit, controls the output frequency and output power of main laser；It is main For the output light of laser after the first half wave plate and the first polarization beam splitter prism, the light of fraction power enters saturation Saturation-absorption spectrum signal is transmitted to programmable logic device by absorption spectrum unit, absorption spectrum unit；Programmable logic device Part obtains the output frequency of main laser according to saturation-absorption spectrum signal；The light of most of power is divided by the first high reflection Piece；The transmitted light of first high reflection light splitting piece enters the first power detector；First power detector is connected to programmable logic Device, measurement obtain the output power of main laser；The reflected light of first high reflection light splitting piece enters the second high reflection light splitting piece, First output light of the reflected light as main laser, transmitted light enter the second polarization beam splitter prism；Programmable logic device connection To frequency stabilization unit, frequency stabilization unit is connected to the first current unit, when the output power and output frequency of main laser are target function When rate and target frequency, programmable logic device starts frequency stabilization unit；Programmable logic device passes temperature and the parameter of electric current The second control temperature unit and the second current unit are transported to, output frequency and output power from laser are controlled；From the defeated of laser Light passes through highly transmissive light splitting piece out；The reflected light of highly transmissive light splitting piece enters the second power detector；Second power detector connects It is connected to programmable logic device, measurement obtains the output power from laser；The transmitted light of highly transmissive light splitting piece passes through the two or two After/mono- wave plate and the second polarization beam splitter prism, the light transmission of most of power is as the second output light from laser；Through After the light reflection of fraction power after second polarization beam splitter prism with the main laser that is transmitted through the second high reflection light splitting piece Swash combiner, high-speed photodetector is entered after quarter-wave plate, generates beat signal；Beat signal is by frequency dividing Device, output frequency are converted to input frequency 1/N, are input to programmable logic device, N is frequency dividing ratio, and N is natural number.
Programmable logic device (CPLD) realizes main laser parameter setting unit, main laser spectrum record by programming Member, main laser power trace unit note down unit, beat signal frequency from laser parameter setup unit, from laser power Rate measuring unit and main control unit；Wherein, main laser parameter setting unit, main laser spectrum recording unit, main laser Power trace unit notes down unit and beat signal frequency measuring unit from laser parameter setup unit, from laser power It is respectively connected to main control unit；First control temperature unit, the first current unit and frequency stabilization unit are separately connected main laser parameter and set The running parameter of main laser is arranged by main laser parameter setting unit for order member, main control unit；Saturation-absorption spectrum list Member is connected to main laser spectrum recording unit, and main laser spectrum recording unit is led by analysis saturation-absorption spectrum The output frequency of laser；First power detector is connected to main laser power trace unit, obtains the output of main laser Power；Second control temperature unit and the second current unit are separately connected from laser parameter setup unit, and main control unit is by from swashing The running parameter from laser is arranged in light device parameter setting unit；Second power detector is connected to from laser power and notes down list Member obtains the output power from laser；Frequency divider is connected to beat signal frequency measuring unit, measures the output letter of frequency divider Number frequency.
First power detector and the second power detector use photodiode.
High-speed photodetector uses indium gallium arsenic detector.
It is another object of the present invention to provide a kind of control methods for judging automatically and setting laser frequency and power.
The control method for judging automatically and setting laser frequency and power of the invention, comprising the following steps:
1) measurement obtains temperature to the regulation rate and electric current of the output frequency of main laser to the defeated of main laser in advance The regulation rate of frequency out, and temperature is measured to the regulation rate of the output frequency from laser and electric current to from the defeated of laser The regulation rate of frequency out will measure obtained known parameters above and be stored in main control unit；And in main control unit in advance The target frequency and target power of storage main laser and target frequency and target power from laser；
2) desired temperature and current setting value of setting scanning main laser, and setting scan the temperature from laser Setting value and current setting value, in order to judge automatically and set the frequency of main laser, main control unit is with certain frequency interval pair The desired temperature of a series of scanning main laser of the temperature step size settings answered, on each desired temperature, master control list Member sets the current setting value of a series of scanning main laser with the corresponding current steps of smaller frequency interval；
3) obtain the first job point of main laser: main control unit passes through main laser parameter setting unit control first Control temperature unit, main control unit generate a series of desired temperature of main lasers, swash since minimum desired temperature to main Light device carries out temperature scanning, and controls the first current unit on each desired temperature with smaller interval scan main laser The current setting value of device, while main laser spectrum recording unit records the saturated absorption light of the main laser after digitlization in real time Spectrum signal, main control unit judge that whether occurring laser and the saturation-absorption spectrum of atomic resonance in the spectral signal recorded believes Number, when main control unit goes out spectrum letter by the ratio in judgement for occurring transmission peaks and the corresponding electric current spacing of transmission peaks in spectral signal After occurring saturation-absorption spectrum signal in number and judging the output frequency of the corresponding main laser of transmission peaks, find and target frequency The equal output frequency of rate, main control unit record main laser output frequency be the corresponding desired temperature of target frequency, The output power of current setting value and at this time main laser, to obtain the first job point of main laser；
4) main control unit compares under the conditions of the first job of main laser point, and the output frequency of main laser is target frequency When rate, the target power of the preset main laser stored in the output power and main control unit of main laser:
If a) difference of main laser output power and target power is within fault-tolerant section, with first job point Parameter be main laser parameter, main control unit by main laser parameter setting unit start frequency stabilization unit, by the defeated of main laser Out Frequency Locking is locked on the resonance point of spectrum at the corresponding spectral signal peak value of target frequency, completes main laser Frequency and power judging automatically and set, enter step 9)；
If b) 5) difference of main laser output power and target power enters step other than fault-tolerant section；
5) it obtains second operating point of main laser: if the output power of main laser is less than target power, increasing Add the current setting value of main laser；If the output power of main laser is greater than target power, reduce the electricity of main laser Setting value is flowed, then according to temperature pre-stored in main control unit to the regulation rate and electric current pair of the output frequency of main laser The regulation rate of the output frequency of main laser calculates, and obtains so that the constant temperature value of the output frequency of main laser；Master control list The temperature of main laser is set as the temperature value being calculated above by member, scans the electric current of main laser again, and search is full With absorption spectrum signal, main control unit judges that the output frequency of the corresponding main laser of spectral signal, main control unit are recorded The output frequency of main laser is the corresponding desired temperature of target frequency, current setting value and the output of main laser at this time Power, to obtain second operating point of main laser；
6) main control unit compares under the conditions of second operating point of main laser, and the output frequency of main laser is target When frequency, the target power of the preset main laser stored in the output power and main control unit of main laser:
If a) difference of main laser output power and target power is within fault-tolerant section, with second operating point Parameter be main laser parameter, main control unit by main laser parameter setting unit start frequency stabilization unit, by the defeated of main laser Out Frequency Locking is locked on the resonance point of spectrum at the corresponding spectral signal peak value of target frequency, completes main laser Frequency and power judging automatically and set, enter step 9)；
If b) 7) difference of main laser output power and target power enters step other than fault-tolerant section；
7) the m-th operating point of main laser is obtained, M initial value is the natural number that 3, M is >=3, and main control unit is according to (M-1) when the output frequency of main laser is target frequency under a operating point and a operating point (M-2), corresponding temperature setting Value, current setting value and output power, the output frequency that main laser is calculated is target frequency and power is target function When rate, the temperature of main laser is set as above-mentioned and is calculated by corresponding desired temperature and current setting value, main control unit Desired temperature, then keep desired temperature it is constant, swept in the continuous tuning coverage of the electric current of the not mode hopping of main laser Electric current is retouched, main control unit judges that the output frequency of main laser, main control unit record main laser according to the spectral signal of record The output frequency of device is the corresponding desired temperature of target frequency, current setting value and the output power of main laser at this time, To obtain the m-th operating point of main laser；
8) main control unit compares under the conditions of the m-th operating point of main laser, and the output frequency of main laser is target When frequency, the target power of the preset main laser stored in the output power and main control unit of main laser:
If a) difference of main laser output power and target power is within fault-tolerant section, with m-th operating point Parameter be main laser parameter, main control unit by main laser parameter setting unit start frequency stabilization unit, by the defeated of main laser Out Frequency Locking is locked on the resonance point of spectrum at the corresponding spectral signal peak value of target frequency, completes main laser Frequency and power judging automatically and set, enter step 9)；
If b) difference of main laser output power and target power is other than fault-tolerant section, M=M+1, return step 7)；
9) obtain the first job point from laser: main control unit is by controlling second from laser parameter setup unit Control temperature unit will be set on a series of desired temperature from laser from the temperature of laser, and in each temperature Current setting value of second current unit with smaller interval scan from laser is controlled in setting value, while main control unit controls Beat signal frequency measuring unit measures the frequency of the output signal of frequency divider, until observe the frequency measurement of non-zero, and Obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when temperature setting Value, current setting value and output power, obtain the first job point from laser；
10) main control unit compares under the conditions of the first job point from laser, is mesh from the output frequency of laser When marking frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) entered step 11) other than fault-tolerant section from the difference of laser output power and target power；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser The frequency of device and judging automatically and setting for power；
11) it obtains from second operating point of laser: if being less than target power from the output power of laser, increasing Add the current setting value from laser；If being greater than target power from the output power of laser, reduce the electricity from laser Setting value is flowed, then according to temperature pre-stored in main control unit to the regulation rate and electric current pair of the output frequency from laser It is calculated from the regulation rate of the output frequency of laser, obtains the temperature value so that constant from the output frequency of laser；Master control list Member will be set as the temperature value being calculated above from the temperature of laser, scan the electric current from laser again, until seeing Observe the frequency measurement of non-zero, while the output signal of main control unit control beat signal frequency measuring unit measurement frequency divider Frequency, and obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when Desired temperature, current setting value and output power are obtained from second operating point of laser；
12) main control unit compares under the conditions of from second operating point of laser, is mesh from the output frequency of laser When marking frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) entered step 13) other than fault-tolerant section from the difference of laser output power and target power；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser The frequency of device and judging automatically and setting for power；
13) it obtains from the m-th operating point of laser, M initial value is the natural number that 3, M is >=3, and main control unit is according to (M-1) when being target frequency from the output frequency of laser under a operating point and a operating point (M-2), corresponding temperature setting Value, current setting value and output power, being calculated from the output frequency of laser is target frequency and power is target function When rate, corresponding desired temperature and current setting value, main control unit will be set as above-mentioned from the temperature of laser and is calculated Desired temperature, then keep desired temperature it is constant, the sweep current near the current setting value being calculated, until see Observe the frequency measurement of non-zero, while the output signal of main control unit control beat signal frequency measuring unit measurement frequency divider Frequency, and obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when Desired temperature, current setting value and output power are obtained from the m-th operating point of laser；
14) main control unit compares under the conditions of from the m-th operating point of laser, is target from the output frequency of laser When frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) from the difference of laser output power and target power other than fault-tolerant section, M=M+1, return step 13)；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser The frequency of device and judging automatically and setting for power.
Wherein, in step 3), the output frequency of the corresponding main laser in interval of every two adjacent desired temperature Interval is less than the continuous tuning coverage of the electric current of the not mode hopping of main laser.
In step 9), the output frequency from laser is obtained, comprising the following steps: when beat signal frequency measuring unit When measuring the frequency of non-zero, the frequency of main laser is ν, and main laser and the beat frequency rate from laser are f, can not be true The fixed output frequency from laser, from the frequency of laser, there are two possible values: ν+f and ν-f at this time；Due to electric current to from The regulation rate of the output frequency of laser is known, so main control unit is adjusted from laser after measuring beat signal Electric current make from the output frequency of laser increase, then again measure beat signal frequency, if the frequency of beat signal Rate increases, and is ν-from the frequency of laser if the frequency of beat signal reduces then being ν+f from the frequency of laser f。
Advantages of the present invention:
The present invention uses twin-laser structure, and main control unit can be searched for automatically according to spectral signal and be judged automatically main sharp Frequency is automatically become locked to atom after the output power to target power of Automatic Optimal main laser by the output frequency of light device Or on molecular spectrum；Beat signal is generated after closing beam from the output of laser and main laser, main control unit can judge automatically The size relation of main laser and the output frequency from laser, thus it is accurate and judge automatically output frequency from laser, After output power to target power of the Automatic Optimal from laser, frequency locking error signal is generated using main control unit, in 80GHz It realizes in range to the locking from laser frequency；Method of the invention can be widely used in laser cooling, atomic frequency standard, former The basic research such as sub- interferometer and laser wavelength meter and Technology of Precision Measurement field.
Detailed description of the invention
Fig. 1 is the structure chart of the control system for judging automatically and setting laser frequency and power of the invention.
Specific embodiment
With reference to the accompanying drawing, by specific embodiment, the present invention is further explained.
As shown in Figure 1, judge automatically and the set laser frequency and the control system of power of the present embodiment include: main laser Device, from laser, the first control temperature unit, the second control temperature unit, the first current unit, the second current unit, the first power detection Device, the second power detector, saturation-absorption spectrum unit, frequency stabilization unit, high-speed photodetector, frequency divider, the first high reflection Light splitting piece, the second high reflection light splitting piece, highly transmissive light splitting piece, the first half wave plate, the second half wave plate, four/ One wave plate, the first polarization beam splitter prism, the second polarization beam splitter prism and programmable logic device (CPLD)；Wherein, programmable logic Device CPLD realizes main laser parameter setting unit, main laser spectrum recording unit, main laser power note by programming It records unit, note down unit, beat signal frequency measuring unit and master control list from laser parameter setup unit, from laser power Member；Main laser parameter setting unit, main laser spectrum recording unit, main laser power trace unit, from laser join Number setup unit is respectively connected to main control unit from laser power record unit and beat signal frequency measuring unit；First Control temperature unit, the first current unit and frequency stabilization unit are separately connected main laser parameter setting unit, and main control unit is swashed by main The running parameter of light device parameter setting unit setting main laser；Saturation-absorption spectrum unit is connected to main laser spectrum record Unit, main laser spectrum recording unit obtain the output frequency of main laser by analysis saturation-absorption spectrum；First power Detector is connected to main laser power trace unit, obtains the output power of main laser；Second control temperature unit and the second electricity Stream unit is separately connected from laser parameter setup unit, and main control unit from laser parameter setup unit by being arranged from laser The running parameter of device；Second power detector is connected to from laser power and notes down unit, obtains the output power from laser； Frequency divider is connected to beat signal frequency measuring unit, measures the frequency of the output signal of frequency divider；Programmable logic device The parameter of temperature and electric current is transmitted to the first control temperature unit and the first electricity by main laser parameter setting unit by main control unit Unit is flowed, the output frequency and output power of main laser are controlled；The output light of main laser passes through the first half wave plate After the first polarization beam splitter prism, the light of 5% power enters saturation-absorption spectrum unit, and absorption spectrum unit is by saturated absorption light Spectrum signal is transmitted to the main laser spectrum recording unit of programmable logic device；The main control unit of programmable logic device according to Saturation-absorption spectrum signal obtains the output frequency of main laser；The light of 95% power passes through the first high reflection light splitting piece；First The light transmission of high reflection light splitting piece 5% enters the first power detector；First power detector is connected to programmable logic device Main laser power trace unit, measurement obtain the output power of main laser；The light of first high reflection light splitting piece 95% is anti- It injecting into the second high reflection light splitting piece, the light of the second high reflection light splitting piece 95% reflects the first output light as main laser, 5% light transmission enters the second polarization beam splitter prism；The main laser parameter setting unit of programmable logic device is connected to surely Frequency unit, frequency stabilization unit are connected to the first current unit, when main laser output power and output frequency be target power and When target frequency, programmable logic device starts frequency stabilization unit；The main control unit of programmable logic device from laser by joining The parameter of temperature and electric current is transmitted to the second control temperature unit and the second current unit by number setup unit, is controlled from the defeated of laser Frequency and output power out；Pass through highly transmissive light splitting piece from the output light of laser；The light of highly transmissive light splitting piece 5% is reflected into Second power detector；Second power detector is connected to the slave laser power record unit of programmable logic device, measurement Obtain the output power from laser；Highly transmissive 95% light of light splitting piece is transmitted through the second half wave plate and the second polarization After beam splitter prism, the light transmission of 95% power is as the second output light from laser；5% after the second polarization beam splitter prism Sharp combiner after the light reflection of power with the main laser transmitted through the second high reflection light splitting piece, after quarter-wave plate Into high-speed photodetector, using indium gallium arsenic detector, measurement frequency bandwidth is 40GHz, generates beat signal；Beat frequency letter Number pass through frequency divider, output frequency be converted to input frequency 1/N, be input to programmable logic device beat signal frequency measurement Unit.
The control method for judging automatically and setting laser frequency and power of the present embodiment, comprising the following steps:
1) measurement obtains temperature to the regulation rate and electric current of the output frequency of main laser to the defeated of main laser in advance The regulation rate of frequency out, and temperature is measured to the regulation rate of the output frequency from laser and electric current to from the defeated of laser The regulation rate of frequency out will measure obtained known parameters above and be stored in main control unit, the order of magnitude of the tuning rate of temperature For 20GHz/K, the order of magnitude of the regulation rate of electric current is 1GHz/mA；And the mesh of main laser is stored in advance in main control unit Mark frequency and target power and target frequency and target power from laser；
2) desired temperature and current setting value of setting scanning main laser, and setting scan the temperature from laser Setting value and current setting value, in order to judge automatically and set the frequency of main laser, main control unit is with certain frequency interval pair The desired temperature of a series of scanning main laser of the temperature step size settings answered, the interval of every two adjacent desired temperature The output frequency interval of corresponding main laser is less than the continuous tuning coverage of the electric current of the not mode hopping of main laser, at each On desired temperature, main control unit sets a series of scanning main laser with the corresponding current steps of smaller frequency interval Current setting value, current steps are related with sample, are 1/10th of the line width of sample；
3) obtain the first job point of main laser: main control unit passes through main laser parameter setting unit control first Control temperature unit, main control unit generate a series of desired temperature of main lasers, swash since minimum desired temperature to main Light device carries out temperature scanning, and controls the first current unit on each desired temperature with smaller interval scan main laser The current setting value of device, while main laser spectrum recording unit records the saturated absorption light of the main laser after digitlization in real time Spectrum signal, main control unit judge that whether occurring laser and the saturation-absorption spectrum of atomic resonance in the spectral signal recorded believes Number, when main control unit goes out spectrum letter by the ratio in judgement for occurring transmission peaks and the corresponding electric current spacing of transmission peaks in spectral signal After occurring saturation-absorption spectrum signal in number and judging the output frequency of the corresponding main laser of transmission peaks, find and target frequency The equal output frequency of rate, main control unit record main laser output frequency be the corresponding desired temperature of target frequency, The output power of current setting value and at this time main laser, to obtain the first job point of main laser；
4) main control unit compares under the conditions of the first job of main laser point, and the output frequency of main laser is target When frequency, the target power of the preset main laser stored in the output power and main control unit of main laser:
If a) difference of main laser output power and target power is within fault-tolerant section, tolerance area in the present embodiment Between be ± 5%, then with the parameter of first job point for main laser parameter, main control unit opened by main laser parameter setting unit Dynamic frequency stabilization unit, the output frequency of main laser is locked at the corresponding spectral signal peak value of target frequency, that is, is locked in light On the resonance point of spectrum, the frequency of main laser and judging automatically and setting for power are completed, is entered step 9)；
If b) 5) difference of main laser output power and target power enters step other than fault-tolerant section；
5) it obtains second operating point of main laser: if the output power of main laser is less than target power, increasing Add the current setting value of main laser；If the output power of main laser is greater than target power, reduce the electricity of main laser Setting value is flowed, then according to temperature pre-stored in main control unit to the regulation rate and electric current pair of the output frequency of main laser The regulation rate of the output frequency of main laser calculates, and obtains so that the constant temperature value of the output frequency of main laser；Master control list The temperature of main laser is set as the temperature value being calculated above by member, scans the electric current of main laser again, and search is full With absorption spectrum signal, main control unit judges that the output frequency of the corresponding main laser of spectral signal, main control unit are recorded The output frequency of main laser is the corresponding desired temperature of target frequency, current setting value and the output of main laser at this time Power, to obtain second operating point of main laser；
6) main control unit compares under the conditions of second operating point, main when the output frequency of main laser is target frequency The target power of the preset main laser stored in the output power and main control unit of laser:
If a) difference of main laser output power and target power is within fault-tolerant section, with second operating point Parameter be main laser parameter, main control unit by main laser parameter setting unit start frequency stabilization unit, by the defeated of main laser Out Frequency Locking is locked on the resonance point of spectrum at the corresponding spectral signal peak value of target frequency, completes main laser Frequency and power judging automatically and set, enter step 9)；
If b) 7) difference of main laser output power and target power enters step other than fault-tolerant section；
7) the m-th operating point of main laser is obtained, M initial value is the natural number that 3, M is >=3, and main control unit is according to (M-1) when the output frequency of main laser is target frequency under a operating point and a operating point (M-2), corresponding temperature setting Value, current setting value and output power, the output frequency that main laser is calculated is target frequency and power is target function When rate, the temperature of main laser is set as above-mentioned and is calculated by corresponding desired temperature and current setting value, main control unit Desired temperature, then keep desired temperature it is constant, swept in the continuous tuning coverage of the electric current of the not mode hopping of main laser Electric current is retouched, main control unit judges that the output frequency of main laser, main control unit record main laser according to the spectral signal of record The output frequency of device is the corresponding desired temperature of target frequency, current setting value and the output power of main laser at this time, To obtain the m-th operating point of main laser；
8) main control unit compares under the conditions of the m-th operating point of main laser, and the output frequency of main laser is target When frequency, the target power of the preset main laser stored in the output power and main control unit of main laser:
If c) difference of main laser output power and target power is within fault-tolerant section (± 5%), with m-th The parameter of operating point is main laser parameter, and main control unit starts frequency stabilization unit by main laser parameter setting unit, by main laser The output frequency of device is locked at the corresponding spectral signal peak value of target frequency, that is, is locked on the resonance point of spectrum, and master is completed 9) frequency of laser and judging automatically and setting for power, enter step；
If d) other than fault-tolerant section (± 5%), M=M+1 is returned the difference of main laser output power and target power Return step 7)；
9) obtain the first job point from laser: main control unit is by controlling second from laser parameter setup unit Control temperature unit will be set on a series of desired temperature from laser from the temperature of laser, and in each temperature Current setting value of second current unit with smaller interval scan from laser is controlled in setting value, while main control unit controls Beat signal frequency measuring unit measures the frequency of the output signal of frequency divider, until observe the frequency measurement of non-zero, this When from the difference on the frequency of laser and main laser within the scope of ± 40GHz, and the output frequency from laser is obtained, when beat frequency is believed When number frequency measurement unit measures the frequency of non-zero, the frequency of main laser is ν, and the beat frequency rate of two lasers is f, The output frequency from laser is not can determine that, there are two possible values: ν+f and ν-f from the frequency of laser at this time；Due to Electric current is known to the regulation rate of the output frequency from laser, so after measuring beat signal, main control unit adjustment To increase from the output frequency of laser from the electric current of laser, the frequency of beat signal is then measured again, if beat frequency The frequency of signal increases, then from the frequency of laser be ν+f, if the frequency of beat signal reduces, from laser Frequency be ν-f, main control unit record from the output frequency of laser be target frequency when desired temperature, current setting value and Output power obtains the first job point from laser；
10) main control unit compares under the conditions of the first job point from laser, is mesh from the output frequency of laser When marking frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) from the difference of laser output power and target power fault-tolerant section (in the present embodiment be ± 5%) with Outside, it enters step 11)；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser The frequency of device and judging automatically and setting for power；
11) it obtains from second operating point of laser: if being less than target power from the output power of laser, increasing Add the current setting value from laser；If being greater than target power from the output power of laser, reduce the electricity from laser Setting value is flowed, then according to temperature pre-stored in main control unit to the regulation rate and electric current pair of the output frequency from laser It is calculated from the regulation rate of the output frequency of laser, obtains the temperature value so that constant from the output frequency of laser；Master control list Member will be set as the temperature value being calculated above from the temperature of laser, scan the electric current from laser again, until seeing Observe the frequency measurement of non-zero, while the output signal of main control unit control beat signal frequency measuring unit measurement frequency divider Frequency, and obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when Desired temperature, current setting value and output power are obtained from second operating point of laser；
12) main control unit compares under the conditions of from second operating point of laser, is mesh from the output frequency of laser When marking frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) entered step 13) other than fault-tolerant section from the difference of laser output power and target power；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser The frequency of device and judging automatically and setting for power；
13) it obtains from the m-th operating point of laser, M initial value is the natural number that 3, M is >=3, and main control unit is according to (M-1) when being target frequency from the output frequency of laser under a operating point and a operating point (M-2), corresponding temperature setting Value, current setting value and output power, being calculated from the output frequency of laser is target frequency and power is target function When rate, corresponding desired temperature and current setting value, main control unit will be set as above-mentioned from the temperature of laser and is calculated Desired temperature, then keep desired temperature it is constant, the sweep current near the current setting value being calculated, until see Observe the frequency measurement of non-zero, while the output signal of main control unit control beat signal frequency measuring unit measurement frequency divider Frequency, and obtain the output frequency from laser, main control unit record from the output frequency of laser be target frequency when Desired temperature, current setting value and output power are obtained from the m-th operating point of laser；
14) main control unit compares under the conditions of from the m-th operating point of laser, is target from the output frequency of laser When frequency, the preset target power from laser that is stored from the output power and main control unit of laser:
If a) from the difference of laser output power and target power other than fault-tolerant section, M=M+1, return step 13)；
If main control unit generates b) from the difference of the output power of laser and target power within fault-tolerant section Frequency locking error signal is realized by being transmitted to the second current unit from laser parameter setup unit by error signal from laser The frequency of device and judging automatically and setting for power.
It is finally noted that the purpose for publicizing and implementing example is to help to further understand the present invention, but this field Technical staff be understood that without departing from the spirit and scope of the invention and the appended claims, it is various replacement and repair It is all possible for changing.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is to weigh Subject to the range that sharp claim defines.

Claims (3)

1.一种自动判断并设定激光频率和功率的控制方法，其特征在于，所述控制方法包括以下步骤：1. a control method for automatically judging and setting laser frequency and power, is characterized in that, described control method comprises the following steps: 1)预先测量得到温度对主激光器的输出频率的调节率以及电流对主激光器的输出频率的调节率，并且测量温度对从激光器的输出频率的调节率以及电流对从激光器的输出频率的调节率，将以上测量得到的已知参数存储在主控单元中；并且在主控单元中预先存储主激光器的目标频率和目标功率以及从激光器的目标频率和目标功率；1) Measure in advance the adjustment rate of temperature to the output frequency of the master laser and the adjustment rate of the current to the output frequency of the master laser, and measure the adjustment rate of temperature to the output frequency of the slave laser and the adjustment rate of the current to the output frequency of the slave laser , the known parameters obtained by the above measurement are stored in the master control unit; and the target frequency and target power of the master laser and the target frequency and target power of the slave laser are pre-stored in the master control unit; 2)设定扫描主激光器的温度设定值和电流设定值，以及设定扫描从激光器的温度设定值和电流设定值，为了自动判断和设定主激光器的频率，主控单元以一定频率间隔对应的温度步长设定一系列的扫描主激光器的温度设定值，在每一个温度设定值上，主控单元以更小的频率间隔对应的电流步长设定一系列的扫描主激光器的电流设定值；2) Set the temperature setting value and current setting value of the scanning master laser, as well as the temperature setting value and current setting value of the scanning slave laser. In order to automatically judge and set the frequency of the master laser, the master control unit uses The temperature step corresponding to a certain frequency interval sets a series of temperature setting values for scanning the main laser. At each temperature setting value, the main control unit sets a series of current steps corresponding to smaller frequency intervals. Scan the current setting value of the main laser; 3)得到主激光器的第一个工作点：主控单元通过主激光器参数设定单元控制第一控温单元，主控单元产生一系列主激光器的温度设定值，从最低的温度设定值开始对主激光器进行温度扫描，并在每一个温度设定值上控制第一电流单元以更小的间隔扫描主激光器的电流设定值，同时主激光器光谱记录单元实时记录数字化后的主激光器的饱和吸收光谱信号，主控单元判断记录下来的光谱信号中是否出现激光与原子共振的饱和吸收光谱信号，当主控单元通过光谱信号中出现透射峰和透射峰对应的电流间距的比值判断出光谱信号中出现饱和吸收光谱信号并判断出透射峰对应的主激光器的输出频率后，找到与目标频率相等的输出频率，主控单元记录下主激光器的输出频率为目标频率对应的温度设定值、电流设定值以及此时主激光器的输出功率，从而得到主激光器的第一个工作点；3) Obtain the first working point of the main laser: the main control unit controls the first temperature control unit through the main laser parameter setting unit, and the main control unit generates a series of temperature setting values of the main laser, starting from the lowest temperature setting value Start to scan the temperature of the main laser, and control the first current unit to scan the current set value of the main laser at smaller intervals on each temperature set value, and at the same time, the main laser spectrum recording unit records the digitized main laser in real time. Saturated absorption spectrum signal, the main control unit judges whether there is a saturable absorption spectrum signal of laser and atomic resonance in the recorded spectral signal, when the main control unit judges the spectrum by the ratio of the transmission peak and the current spacing corresponding to the transmission peak in the spectral signal After the saturable absorption spectrum signal appears in the signal and the output frequency of the main laser corresponding to the transmission peak is determined, the output frequency equal to the target frequency is found, and the main control unit records the output frequency of the main laser as the temperature setting value corresponding to the target frequency, The current setting value and the output power of the main laser at this time, so as to obtain the first operating point of the main laser; 4)主控单元比较在主激光的第一个工作点条件下，主激光器的输出频率为目标频率时，主激光器的输出功率与主控单元中存储的预设的主激光器的目标功率：4) The main control unit compares the output power of the main laser with the preset target power of the main laser stored in the main control unit when the output frequency of the main laser is the target frequency under the condition of the first operating point of the main laser: a)如果主激光器输出功率与目标功率的差值在容错区间以内，则以第一个工作点的参数为主激光参数，主控单元通过主激光参数设定单元启动稳频单元，将主激光器的输出频率锁定在目标频率对应的光谱信号峰值处，即锁定在光谱的共振点上，完成主激光器的频率和功率的自动判断和设定，进入步骤9)；a) If the difference between the output power of the main laser and the target power is within the fault tolerance range, the parameters of the first operating point are used as the main laser parameters, and the main control unit starts the frequency stabilization unit through the main laser parameter setting unit, and sets the main laser The output frequency is locked at the peak of the spectral signal corresponding to the target frequency, that is, locked at the resonance point of the spectrum, completes the automatic judgment and setting of the frequency and power of the main laser, and enters step 9); b)如果主激光器输出功率与目标功率的差值在容错区间以外，进入步骤5)；b) If the difference between the output power of the main laser and the target power is outside the fault tolerance interval, go to step 5); 5)得到主激光器的第二个工作点：如果主激光器的输出功率小于目标功率，则增加主激光器的电流设定值；如果主激光器的输出功率大于目标功率，则减小主激光器的电流设定值，然后根据主控单元中预先存储的温度对主激光器的输出频率的调节率和电流对主激光器的输出频率的调节率计算，得到使得主激光器的输出频率不变的温度值；主控单元将主激光器的温度设定为上面的计算得到的温度值，再次扫描主激光器的电流，搜索饱和吸收光谱信号，主控单元判断出光谱信号对应的主激光器的输出频率，主控单元记录下主激光器的输出频率为目标频率对应的温度设定值、电流设定值以及此时主激光器的输出功率，从而得到主激光器的第二个工作点；5) Obtain the second working point of the main laser: if the output power of the main laser is less than the target power, increase the current setting value of the main laser; if the output power of the main laser is greater than the target power, decrease the current setting value of the main laser. Set the value, and then calculate the adjustment rate of the output frequency of the main laser by the temperature pre-stored in the main control unit and the adjustment rate of the output frequency of the main laser by the current to obtain the temperature value that keeps the output frequency of the main laser unchanged; The unit sets the temperature of the main laser to the temperature value calculated above, scans the current of the main laser again, and searches for the saturable absorption spectrum signal. The main control unit determines the output frequency of the main laser corresponding to the spectral signal, and the main control unit records it. The output frequency of the main laser is the temperature setting value corresponding to the target frequency, the current setting value and the output power of the main laser at this time, so as to obtain the second operating point of the main laser; 6)主控单元比较在主激光器的第二个工作点条件下，主激光器的输出频率为目标频率时，主激光器的输出功率与主控单元中存储的预设的主激光器的目标功率：6) The main control unit compares the output power of the main laser with the preset target power of the main laser stored in the main control unit when the output frequency of the main laser is the target frequency under the condition of the second operating point of the main laser: a)如果主激光器输出功率与目标功率的差值在容错区间以内，则以第二个工作点的参数为主激光参数，主控单元通过主激光参数设定单元启动稳频单元，将主激光器的输出频率锁定在目标频率对应的光谱信号峰值处，即锁定在光谱的共振点上，完成主激光器的频率和功率的自动判断和设定，进入步骤9)；a) If the difference between the output power of the main laser and the target power is within the fault tolerance range, the parameters of the second operating point are used as the main laser parameters, and the main control unit starts the frequency stabilization unit through the main laser parameter setting unit, and sets the main laser The output frequency is locked at the peak of the spectral signal corresponding to the target frequency, that is, locked at the resonance point of the spectrum, completes the automatic judgment and setting of the frequency and power of the main laser, and enters step 9); b)如果主激光器输出功率与目标功率的差值在容错区间以外，进入步骤7)；b) If the difference between the output power of the main laser and the target power is outside the fault tolerance interval, go to step 7); 7)得到主激光器的第M个工作点，M初始值为3，M为≥3的自然数，主控单元根据第(M-1)个工作点和第(M-2)个工作点下主激光器的输出频率为目标频率时，对应的温度设定值、电流设定值以及输出功率，计算得到主激光器的输出频率为目标频率且功率为目标功率时，对应的温度设定值和电流设定值，主控单元将主激光器的温度设定为上述计算得到的温度设定值，然后保持温度设定值不变，在主激光器的不跳模的电流的连续调谐范围扫描电流，主控单元根据记录的光谱信号判断主激光器的输出频率，主控单元记录下主激光器的输出频率为目标频率对应的温度设定值、电流设定值以及此时主激光器的输出功率，从而得到主激光器的第M个工作点；7) Obtain the Mth working point of the main laser, the initial value of M is 3, and M is a natural number ≥3. When the output frequency of the laser is the target frequency, the corresponding temperature setting value, current setting value and output power are calculated. When the output frequency of the main laser is the target frequency and the power is the target power, the corresponding temperature setting value and current setting value are calculated. The main control unit sets the temperature of the main laser to the temperature set value calculated above, and then keeps the temperature set value unchanged, sweeps the current in the continuous tuning range of the current of the main laser without mode jumping, and the main control The unit judges the output frequency of the main laser according to the recorded spectral signal, and the main control unit records the output frequency of the main laser as the temperature setting value, current setting value and the output power of the main laser corresponding to the target frequency, so as to obtain the main laser The Mth working point of ; 8)主控单元比较在主激光器的第M个工作点条件下，主激光器的输出频率为目标频率时，主激光器的输出功率与主控单元中存储的预设的主激光器的目标功率：8) The main control unit compares the output power of the main laser and the preset target power of the main laser stored in the main control unit when the output frequency of the main laser is the target frequency under the condition of the Mth operating point of the main laser: a)如果主激光器输出功率与目标功率的差值在容错区间以内，则以第M个工作点的参数为主激光参数，主控单元通过主激光参数设定单元启动稳频单元，将主激光器的输出频率锁定在目标频率对应的光谱信号峰值处，即锁定在光谱的共振点上，完成主激光器的频率和功率的自动判断和设定，进入步骤9)；a) If the difference between the output power of the main laser and the target power is within the fault tolerance range, the parameters of the Mth operating point are used as the main laser parameters, and the main control unit starts the frequency stabilization unit through the main laser parameter setting unit, and sets the main laser The output frequency is locked at the peak of the spectral signal corresponding to the target frequency, that is, locked at the resonance point of the spectrum, completes the automatic judgment and setting of the frequency and power of the main laser, and enters step 9); b)如果主激光器输出功率与目标功率的差值在容错区间以外，M＝M+1，返回步骤7)；b) If the difference between the output power of the main laser and the target power is outside the fault tolerance interval, M=M+1, go back to step 7); 9)得到从激光器的第一个工作点：主控单元通过从激光器参数设定单元控制第二控温单元，将从激光器的温度设定在一系列的从激光器的温度设定值上，并在每一个温度设定值上控制第二电流单元以更小的间隔扫描从激光器的电流设定值，同时主控单元控制拍频信号频率测量单元测量分频器的输出信号的频率，直至观察到非零的频率测量值，并得到从激光器的输出频率，主控单元记录从激光器的输出频率为目标频率时的温度设定值、电流设定值和输出功率，得到从激光器的第一个工作点；9) Obtain the first working point of the slave laser: the master control unit controls the second temperature control unit through the slave laser parameter setting unit, sets the temperature of the slave laser on a series of temperature setting values of the slave laser, and At each temperature setting value, the second current unit is controlled to scan the current setting value of the slave laser at smaller intervals, and the main control unit controls the beat frequency signal frequency measurement unit to measure the frequency of the output signal of the frequency divider until the observation To a non-zero frequency measurement value, and obtain the output frequency of the slave laser, the main control unit records the temperature setting value, current setting value and output power when the output frequency of the slave laser is the target frequency, and obtains the first output frequency of the slave laser. work point; 10)主控单元比较在从激光器的第一个工作点条件下，从激光器的输出频率为目标频率时，从激光器的输出功率与主控单元中存储的预设的从激光器的目标功率：10) The master control unit compares the output power of the slave laser with the preset target power of the slave laser stored in the master control unit when the output frequency of the slave laser is the target frequency under the condition of the first operating point of the slave laser: a)如果从激光器输出功率与目标功率的差值在容错区间以外，进入步骤11)；a) If the difference between the output power of the slave laser and the target power is outside the fault tolerance interval, go to step 11); b)如果从激光器的输出功率与目标功率的差值在容错区间以内，则主控单元生成锁频误差信号，通过从激光器参数设定单元将误差信号传输至第二电流单元，实现从激光器的频率和功率的自动判断和设定；b) If the difference between the output power of the slave laser and the target power is within the fault tolerance interval, the master control unit generates a frequency-locking error signal, and transmits the error signal to the second current unit through the slave laser parameter setting unit to realize the slave laser Automatic judgment and setting of frequency and power; 11)得到从激光器的第二个工作点：如果从激光器的输出功率小于目标功率，则增加从激光器的电流设定值；如果从激光器的输出功率大于目标功率，则减小从激光器的电流设定值，然后根据主控单元中预先存储的温度对从激光器的输出频率的调节率和电流对从激光器的输出频率的调节率计算，得到使得从激光器的输出频率不变的温度值；主控单元将从激光器的温度设定为上面的计算得到的温度值，再次扫描从激光器的电流，直至观察到非零的频率测量值，同时主控单元控制拍频信号频率测量单元测量分频器的输出信号的频率，并得到从激光器的输出频率，主控单元记录从激光器的输出频率为目标频率时的温度设定值、电流设定值和输出功率，得到从激光器的第二个工作点；11) Obtain the second operating point of the slave laser: if the output power of the slave laser is less than the target power, increase the current setting value of the slave laser; if the output power of the slave laser is greater than the target power, decrease the current setting value of the slave laser. Set the value, and then calculate the adjustment rate of the output frequency of the slave laser by the temperature pre-stored in the master control unit and the adjustment rate of the output frequency of the slave laser by the current to obtain the temperature value that makes the output frequency of the slave laser unchanged; the master control The unit sets the temperature from the laser to the temperature value calculated above, and scans the current from the laser again until a non-zero frequency measurement value is observed. At the same time, the main control unit controls the beat signal frequency measurement unit to measure the frequency of the divider. The frequency of the output signal is obtained, and the output frequency of the slave laser is obtained. The master control unit records the temperature setting value, current setting value and output power when the output frequency of the slave laser is the target frequency, and obtains the second working point of the slave laser; 12)主控单元比较在从激光器的第二个工作点条件下，从激光器的输出频率为目标频率时，从激光器的输出功率与主控单元中存储的预设的从激光器的目标功率：12) The master control unit compares the output power of the slave laser with the preset target power of the slave laser stored in the master control unit when the output frequency of the slave laser is the target frequency under the condition of the second working point of the slave laser: a)如果从激光器输出功率与目标功率的差值在容错区间以外，进入步骤13)；a) If the difference between the output power of the slave laser and the target power is outside the fault tolerance interval, go to step 13); b)如果从激光器的输出功率与目标功率的差值在容错区间以内，则主控单元生成锁频误差信号，通过从激光器参数设定单元将误差信号传输至第二电流单元，实现从激光器的频率和功率的自动判断和设定；b) If the difference between the output power of the slave laser and the target power is within the fault tolerance interval, the master control unit generates a frequency-locking error signal, and transmits the error signal to the second current unit through the slave laser parameter setting unit to realize the slave laser Automatic judgment and setting of frequency and power; 13)得到从激光器的第M个工作点，M初始值为3，M为≥3的自然数，主控单元根据第(M-1)个工作点和第(M-2)个工作点下从激光器的输出频率为目标频率时，对应的温度设定值、电流设定值以及输出功率，计算得到从激光器的输出频率为目标频率且功率为目标功率时，对应的温度设定值和电流设定值，主控单元将从激光器的温度设定为上述计算得到的温度设定值，然后保持温度设定值不变，在计算得到的电流设定值附近扫描电流，直至观察到非零的频率测量值，同时主控单元控制拍频信号频率测量单元测量分频器的输出信号的频率，并得到从激光器的输出频率，主控单元记录从激光器的输出频率为目标频率时的温度设定值、电流设定值和输出功率，得到从激光器的第M个工作点；13) Obtain the Mth working point of the slave laser, the initial value of M is 3, and M is a natural number ≥3. When the output frequency of the laser is the target frequency, the corresponding temperature setting value, current setting value and output power are calculated. When the output frequency of the slave laser is the target frequency and the power is the target power, the corresponding temperature setting value and current setting value are calculated. Fixed value, the main control unit will set the temperature of the laser to the temperature set value calculated above, then keep the temperature set value unchanged, and scan the current around the calculated current set value until a non-zero value is observed. At the same time, the main control unit controls the beat frequency signal frequency measurement unit to measure the frequency of the output signal of the frequency divider, and obtains the output frequency of the slave laser. The main control unit records the temperature setting when the output frequency of the slave laser is the target frequency value, current setting value and output power, get the Mth working point of the slave laser; 14)主控单元比较在从激光器的第M个工作点条件下，从激光器的输出频率为目标频率时，从激光器的输出功率与主控单元中存储的预设的从激光器的目标功率：14) The master control unit compares the target power of the slave laser from the output power of the slave laser and the preset slave laser stored in the master control unit when the output frequency of the slave laser is the target frequency under the condition of the Mth working point of the slave laser: a)如果从激光器输出功率与目标功率的差值在容错区间以外，M＝M+1，返回步骤13)；a) If the difference between the output power of the slave laser and the target power is outside the fault tolerance interval, M=M+1, and return to step 13); b)如果从激光器的输出功率与目标功率的差值在容错区间以内，则主控单元生成锁频误差信号，通过从激光器参数设定单元将误差信号传输至第二电流单元，实现从激光器的频率和功率的自动判断和设定。b) If the difference between the output power of the slave laser and the target power is within the fault tolerance interval, the master control unit generates a frequency-locking error signal, and transmits the error signal to the second current unit through the slave laser parameter setting unit to realize the slave laser Automatic judgment and setting of frequency and power. 2.如权利要求1所述的控制方法，其特征在于，在步骤3)中，每两个相邻的温度设定值的间隔对应的主激光器的输出频率间隔小于主激光器的不跳模的电流的连续调谐范围。2. control method as claimed in claim 1 is characterized in that, in step 3) in, the output frequency interval of the main laser corresponding to the interval of every two adjacent temperature setting values is less than the non-mode-hopping of main laser. Continuous tuning range of current. 3.如权利要求1所述的控制方法，其特征在于，在步骤9)中，得到从激光器的输出频率，包括以下步骤：当拍频信号频率测量单元测量到非零的频率时，主激光器的频率为ν，两台激光器的拍频频率为f，并不能确定从激光器的输出频率，此时从激光器的频率有两个可能的取值:ν+f和ν-f；由于电流对从激光器的输出频率的调节率是已知的，所以在测量到拍频信号后，主控单元调整从激光器的电流使得从激光器的输出频率升高，然后再次测量拍频信号的频率，如果拍频信号的频率升高，那么从激光器的频率为ν+f，如果拍频信号的频率降低，那么从激光器的频率为ν-f。3. control method as claimed in claim 1 is characterized in that, in step 9), obtains the output frequency of slave laser, comprises the following steps: when beat frequency signal frequency measurement unit measures non-zero frequency, master laser The frequency of the slave laser is ν, the beat frequency of the two lasers is f, and the output frequency of the slave laser cannot be determined. At this time, the frequency of the slave laser has two possible values: ν+f and ν-f; The adjustment rate of the output frequency of the laser is known, so after measuring the beat frequency signal, the master control unit adjusts the current of the slave laser to increase the output frequency of the slave laser, and then measures the frequency of the beat frequency signal again, if the beat frequency If the frequency of the signal increases, then the frequency of the slave laser is ν+f, and if the frequency of the beat signal decreases, then the frequency of the slave laser is ν-f.
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