CN109000795B - Pulse laser spectrum time resolution measurement system and measurement method - Google Patents
Pulse laser spectrum time resolution measurement system and measurement method Download PDFInfo
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- CN109000795B CN109000795B CN201810663088.3A CN201810663088A CN109000795B CN 109000795 B CN109000795 B CN 109000795B CN 201810663088 A CN201810663088 A CN 201810663088A CN 109000795 B CN109000795 B CN 109000795B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2889—Rapid scan spectrometers; Time resolved spectrometry
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Abstract
The invention discloses a pulse laser spectrum time resolution measuring system and a method, wherein the measuring system comprises a synchronous controller, a dispersion beam splitting optical path, an optical fiber array receiver, a photoelectric array receiving and converting module and a multichannel data acquisition module; the synchronous controller is connected with the pulse laser light source and the multichannel data acquisition module; the dispersion beam splitting optical path outputs laser pulse signals with a plurality of wavelengths, the laser pulse signals with the plurality of wavelengths are transmitted to the photoelectric array receiving and converting module through a plurality of optical fibers with equal lengths in a one-to-one correspondence manner, and each photoelectric detection unit performs photoelectric conversion on the laser pulse signals output by the corresponding receiving end to form a plurality of electric pulse signals; the multiple electrical pulse signals are acquired by the multichannel data acquisition module, A/D converted and stored. The invention solves the problem that the traditional spectrometer cannot measure and obtain the spectrum time information, and can provide help for spectrum radiation characteristic analysis and laser radiation dynamic process analysis.
Description
Technical Field
The invention relates to the field of laser spectrum measurement, in particular to a pulse laser spectrum time resolution measurement system and a measurement method.
Background
The spectrum response wave band of the common spectrometer is visible light to near infrared, and the laser spectrum distribution can be measured. In some special application occasions, time resolution measurement is needed for the spectrum, so that the time resolution measurement of the laser spectrum is completed because a common spectrometer cannot meet the measurement requirement.
Disclosure of Invention
The invention provides a pulse laser spectrum time resolution measuring system and a measuring method, which aim to solve the technical problem that the existing common spectrometer can not perform time resolution measurement on a spectrum.
The technical scheme of the invention is as follows:
the invention relates to a pulse laser spectrum time resolution measuring system, which is characterized in that:
the system comprises a synchronous controller 10, a dispersion light splitting optical path, an optical fiber array receiver 4, a photoelectric array receiving and converting module 6, a plurality of transmission cables 7 with equal length and a multi-channel data acquisition module 8;
the optical fiber array receiver 4 comprises a plurality of optical fibers 5 with equal lengths; the photoelectric array receiving and converting module 6 comprises a plurality of photoelectric detection units which are in one-to-one correspondence with a plurality of optical fibers 5 with equal lengths;
the synchronous controller 10 is connected with the pulse laser light source 1 and the multichannel data acquisition module 8;
the dispersion light splitting optical path is arranged on the emergent optical path of the pulse laser light source 1 and outputs laser pulse signals with a plurality of wavelengths;
the laser pulse signals with multiple wavelengths are transmitted to a plurality of photoelectric detection units in one-to-one correspondence through a plurality of optical fibers 5 with the same length, and the photoelectric detection units perform photoelectric conversion on the input laser pulse signals to form a plurality of electric pulse signals;
the multiple electrical pulse signals are transmitted into the multi-channel data acquisition module 8 through a plurality of transmission cables 7 with equal lengths in a one-to-one correspondence mode, and the multi-channel data acquisition module 8 performs A/D conversion and storage on the multiple electrical pulse signals.
Further, the pulse laser spectrum time resolution measuring system of the invention also comprises a PC 9 connected with the multi-channel data acquisition module 8. The PC 9 is used for completing the data storage and display of the signals uploaded by the multichannel data acquisition module 8.
Further, the pulse laser spectrum time resolution measuring system of the invention further comprises a focusing lens 2, wherein the focusing lens 2 is arranged between the outlet of the pulse laser source 1 and the inlet of the dispersion beam splitting optical path, and collects the light of the pulse laser source 1 into the dispersion beam splitting optical path.
Further, for light collection capability, the fiber array receiver 4 of the present invention further includes a fixing fixture 43 and a collection lens 41 corresponding to the plurality of optical fibers 5 with equal lengths, the collection lens 41 is disposed between the corresponding optical fiber 5 and the spectrum scale 35, the fiber end face 42 of the optical fiber 5 is located at the focal point of the collection lens 41, and the plurality of optical fibers 5 with equal lengths and the collection lens 41 are all installed and positioned by means of the fixing fixture 43.
Further, the dispersive spectroscopic optical path includes an entrance slit 31, a mirror i 32, a grating 33, a mirror ii 34, and a spectral scale 35 sequentially disposed on the outgoing optical path of the focusing lens 2.
Further, the focusing lens 2 is made of CaF 2 Is a convex lens, and the focal length of the lens is 1m.
Further, the spectroscopic capacity of the dispersive spectroscopic path was 1nm/mm.
Meanwhile, the invention also provides a pulse laser spectrum time resolution measuring method, which is characterized in that:
1) The synchronous controller 10 generates two paths of control signals, one path of read signal is used for controlling the multichannel data acquisition module 8, the other path of Trg signal is used for controlling the pulsed laser light source 1 to emit light, and the time difference of the two paths of control signals is Deltat and Deltat >0;
2) The emergent light of the pulse laser light source 1 enters a dispersion light splitting optical path to split light, and laser pulse signals with multiple wavelengths are generated;
3) The laser pulse signals with multiple wavelengths are conducted into the photoelectric array receiving and converting module 6 through a plurality of optical fibers 5 with equal lengths in a one-to-one correspondence manner;
4) The photoelectric array receiving and converting module 6 performs photoelectric conversion on laser pulse signals with multiple wavelengths to form multiple electrical pulse signals;
5) The multiple electric pulse signals are transmitted into a multiple data acquisition module through multiple transmission cables 7 with equal lengths in a one-to-one correspondence manner, the multiple data acquisition module performs A/D conversion on the multiple electric pulse signals to correspondingly generate multiple channels of electric digital signals, and time and amplitude information of the multiple channels of electric digital signals are recorded and stored;
6) Analyzing the time information of the electrical digital signals of the same channel to obtain the forming time and the maintaining time of the laser pulse with the wavelength corresponding to the channel;
and comparing the time information of the electrical digital signals of different channels to obtain the time resolution of the laser pulses with different wavelengths.
Further, to ensure the integrity of the recorded signals of each channel, the multiple channels in step 5) areThe acquisition time of the data acquisition module 8 is t read ，t read ＝△t+2×t pulse Wherein t is pulse Is the laser pulse width.
Further, the collecting rate of the sub-channel collecting in the step 5) is determined according to the shortest laser pulse width in the laser pulse signals with a plurality of wavelengths.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can carry out dispersion light splitting, transmission, photoelectric conversion, A/D conversion, storage and analysis on the pulse laser, can carry out time resolution measurement on the spectrum of the pulse laser, and can give out time differences of spectral lines with different wavelengths in the laser spectrum.
2. The invention can analyze the emergent time of different laser wavelengths and the maintaining time of the wavelength radiation by using the time resolution measurement of the laser spectrum, thereby analyzing and researching the relevant information of the laser dynamics process.
Drawings
FIG. 1 is a schematic diagram of a measurement system according to the present invention;
FIG. 2 is a schematic diagram of a device for measuring the radiation spectrum time resolution of an infrared pulse HF laser according to an embodiment of the present invention;
FIG. 3 is a diagram of the mating structure of a spectral scale and a fiber array receiver;
FIG. 4 is a timing diagram of a laser trigger signal Trg, a control signal read of a multi-channel data acquisition module, and a plurality of wavelength laser pulse signals according to an embodiment of the present invention;
wherein, the reference numerals are as follows: 1-a pulsed laser light source; 2-focusing lens; 3-a housing; 31-entrance slit, 32-mirror I; 34-mirror II; 33-grating, 35-spectrum scale, 4-fiber array receiver, 41-collecting lens, 42-fiber end face, 43-fixed clamp, 5-fiber, 6-photoelectric array receiving and converting module, 7-transmission cable, 8-multichannel data acquisition module, 9-PC and 10-synchronous controller.
Detailed Description
A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
In the present embodiment, the pulsed laser light source 1 is a mid-infrared pulsed HF laser having a multi-wavelength output characteristic.
As shown in fig. 1-2, the pulse laser spectrum time resolution measuring system of the invention comprises a focusing lens 2, a dispersion beam splitting optical path, an optical fiber array receiver 4, a photoelectric array receiving and converting module 6, a plurality of transmission cables 7, a multichannel data acquisition module 8, a PC 9 and a synchronous controller 10.
The middle infrared pulse HF laser works in an external trigger mode, and the laser has an external trigger control function. The focusing lens 2 is arranged between the outlet of the mid-infrared pulse laser light source and the inlet of the dispersion beam splitting optical path, and collects the light of the mid-infrared pulse laser light source into the dispersion beam splitting optical path. The dispersive optical path has a dispersion function, and a wavelength position is marked at the end of the optical path, and the dispersive optical path is located in the housing 3. The dispersive light path comprises an entrance slit 31, a reflector I32, a grating 33, a reflector II 34 and a spectrum scale 35 for calibrating the spectrum line position, which are sequentially arranged on the emergent light path of the focusing lens 2.
As shown in fig. 3, the optical fiber array receiver 4 of the present invention includes a fixing jig 43, a plurality of optical fibers 5 having equal lengths, and a collecting lens 41 in one-to-one correspondence with the plurality of optical fibers 5 having equal lengths, the collecting lens 41 being disposed between the corresponding optical fiber 5 and the spectral scale 35 for collecting optical signals of a specific wavelength λi (i=1 to n); the fiber end face 42 of the optical fiber 5 is positioned at the focal point of the collecting lens 41, and the collected light is transmitted by the optical fiber. The plurality of optical fibers 5 and the collection lens 41 each having the same length are mounted and positioned by the fixing jig 43, and are mounted at specific positions corresponding to the spectral scales λi (i=1 to n), and the laser signals are collected and conducted by the optical fibers 5.
The photoelectric array receiving and converting module 6 is internally provided with a plurality of photoelectric detection units which are linearly arranged, the number of the photoelectric detection units corresponds to that of the HF laser wavelength data, each photoelectric detection unit has a faster time response, and photoelectric conversion of each path of 100ns pulse laser pulse signals is completed. The multi-channel data acquisition module 8 has an external trigger function and a plurality of data acquisition channels, each acquisition channel corresponding to one of the photoelectric detection units in the fiber array receiver 4, the data acquisition module having a high levelAnd the speed data acquisition function, the acquisition speed is determined according to the shortest laser pulse width and is matched with the shortest laser pulse width, and the A/D conversion function of signals can be completed and uploaded to the PC 9. In an embodiment, the acquisition rate of the multi-channel data acquisition module 8 is not less than 100MHz, and the undistorted acquisition of the 100ns laser pulse signal can be achieved. The multi-channel data acquisition module 8 has an external trigger function. The PC 9 is used for completing the data storage and display of the signals uploaded by the multichannel data acquisition module 8. The focusing lens 2 is made of CaF 2 The lens is a convex lens, and the focal length of the lens is 1m; the synchronous controller 10 has two paths of TTL signal outputs, and can control delay time Deltat of the two paths of signals, so that the recording start time of the data acquisition module is earlier than the light emitting time of the laser, and the data acquisition module can start synchronously recording signal data of each channel before the split multi-wavelength laser signal reaches the multi-channel data acquisition module 8.
The invention provides a middle infrared pulse laser spectrum time resolution measuring method, which comprises the following steps:
1) The synchronous controller 10 generates two paths of control signals, one path of read signal is used for controlling the multichannel data acquisition module 8, the other path of Trg signal is used for controlling the pulsed HF laser to emit light, and the two paths of control signals have a time difference of Deltat (Deltat > 0). The waveforms of the read signal and the Trg signal are shown in fig. 4.
2) The emergent light of the pulse laser light source enters a dispersion light splitting path to split light, and laser pulse signals with multiple wavelengths are generated;
3) The laser pulse signals with multiple wavelengths are conducted into the photoelectric array receiving and converting module 6 through a plurality of optical fibers 5 with equal lengths in a one-to-one correspondence manner;
4) The photoelectric array receiving and converting module 6 performs photoelectric conversion on laser pulse signals with multiple wavelengths to form multiple electrical pulse signals;
5) The multiple electrical pulse signals are transmitted into a multiple-channel data acquisition module through multiple transmission cables 7 with equal lengths in a one-to-one correspondence manner, the multiple-channel data acquisition module performs A/D conversion on the multiple electrical pulse signals to correspondingly generate multiple-channel electrical digital signals, and time and amplitude information of the multiple-channel electrical digital signals are recorded and stored, as shown in fig. 4;
6) Analyzing the time information of the electrical digital signals of the same channel to obtain the forming time and the maintaining time of the laser pulse with the wavelength corresponding to the channel;
and comparing the time information of the electrical digital signals of different channels to obtain the time resolution of the laser pulses with different wavelengths.
In the present invention, the multi-channel data acquisition module 8 acquires the time period t read The high level control of the read signal, the read signal is advanced to the Trg signal, and after the single light emitting of the laser is finished, the read signal can be taken as 2 times of laser pulse width, namely: t is t read ＝△t+2×t pulse Wherein t is pulse Is the laser pulse width to ensure the integrity of the recorded signals of each channel.
Claims (8)
1. A pulse laser spectrum time resolution measuring method adopts a pulse laser spectrum time resolution measuring system, wherein the measuring system comprises a synchronous controller (10), a dispersion beam splitting optical path, an optical fiber array receiver (4), a photoelectric array receiving and converting module (6), a plurality of transmission cables (7) with equal length and a multichannel data acquisition module (8); the optical fiber array receiver (4) comprises a plurality of optical fibers (5) with equal lengths; the photoelectric array receiving and converting module (6) comprises a plurality of photoelectric detection units which are in one-to-one correspondence with a plurality of optical fibers (5) with equal lengths; the synchronous controller (10) is connected with the pulse laser light source (1) and the multichannel data acquisition module (8); the dispersion light splitting optical path is arranged on an emergent optical path of the pulse laser light source (1) and outputs laser pulse signals with a plurality of wavelengths; the laser pulse signals with multiple wavelengths are transmitted to a plurality of photoelectric detection units in one-to-one correspondence through a plurality of optical fibers (5) with equal lengths, and the photoelectric detection units perform photoelectric conversion on the input laser pulse signals to form a plurality of electric pulse signals; the electric pulse signals are transmitted into a multi-channel data acquisition module (8) through a plurality of transmission cables (7) with equal lengths in a one-to-one correspondence manner, and the multi-channel data acquisition module (8) performs A/D conversion and storage on the electric pulse signals;
the method is characterized in that:
1) The synchronous controller (10) generates two paths of control signals, one path of read signal is used for controlling the multichannel data acquisition module (8), the other path of Trg signal is used for controlling the pulse laser light source (1) to emit light, and the time difference of the two paths of control signals is delta t, and delta t is more than 0;
2) The emergent light of the pulse laser light source (1) enters a dispersion light splitting optical path to split light, and laser pulse signals with multiple wavelengths are generated;
3) The laser pulse signals with multiple wavelengths are conducted into the photoelectric array receiving and converting module (6) through a plurality of optical fibers (5) with equal lengths in a one-to-one correspondence manner;
4) The photoelectric array receiving and converting module (6) performs photoelectric conversion on laser pulse signals with multiple wavelengths to form multiple electrical pulse signals;
5) The multiple electric pulse signals are transmitted into a multi-channel data acquisition module (8) through a plurality of transmission cables (7) with equal lengths in a one-to-one correspondence manner, the multi-channel data acquisition module (8) performs A/D conversion on the multiple electric pulse signals to correspondingly generate electric digital signals of multiple channels, and time and amplitude information of the electric digital signals of the multiple channels are recorded and stored;
6) And comparing the time information of the electrical digital signals of different channels to obtain the time resolution of the laser pulses with different wavelengths.
2. The pulsed laser spectral time-resolved measurement method of claim 1, wherein:
the acquisition time length of the multichannel data acquisition module (8) in the step 5) is t read ，t read ＝△t+2×t pulse Wherein t is pulse Is the laser pulse width.
3. The pulsed laser spectral time-resolved measurement method according to claim 1 or 2, characterized in that:
the acquisition rate of the multi-path data acquisition module in the step 5) is determined according to the shortest laser pulse width in the laser pulse signals with a plurality of wavelengths.
4. The pulsed laser spectral time-resolved measurement method of claim 1, wherein:
the measuring system also comprises a PC (9) connected with the multichannel data acquisition module (8).
5. The method for measuring the spectrum time resolution of the pulse laser according to claim 4, wherein:
the measuring system further comprises a focusing lens (2), and the focusing lens (2) is arranged between the outlet of the pulse laser light source (1) and the inlet of the dispersion beam splitting optical path.
6. The method for measuring the spectrum time resolution of the pulse laser according to claim 5, wherein the method comprises the following steps:
the dispersion light splitting light path in the measuring system comprises an incident slit (31), a reflecting mirror I (32), a grating (33), a reflecting mirror II (34) and a spectrum scale (35) which are sequentially arranged on the emergent light path of the focusing lens (2).
7. The pulse laser spectrum time resolution measuring method according to claim 5 or 6, wherein:
the optical fiber array receiver (4) in the measuring system further comprises a fixing clamp (43) and collecting lenses (41) which are in one-to-one correspondence with the optical fibers (5) with the same length, the collecting lenses (41) are arranged between the corresponding optical fibers (5) and the spectrum scale (35), the optical fiber end faces (42) of the optical fibers (5) are positioned at the focal points of the collecting lenses (41), and the optical fibers (5) with the same length and the collecting lenses (41) are installed and positioned by means of the fixing clamp (43).
8. The pulse laser spectroscopy time-resolved measurement method of claim 7, wherein:
the focusing lens (2) in the measuring system is made of CaF 2 Is a convex lens, and the focal length of the lens is 1m.
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| CN110146160B (en) * | 2019-06-04 | 2021-08-31 | 中国电子科技集团公司第四十四研究所 | High-time-resolution CCD detector structure |
| CN115372337A (en) * | 2021-05-18 | 2022-11-22 | 北京理工大学 | A Rapid Quantitative Prediction Method of Electrostatic Sensitivity of Propellant and Explosives Based on Statistical Spectroscopy |
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