CN109556591A - A kind of passive type lasergyro based on super stabilized laser - Google Patents
A kind of passive type lasergyro based on super stabilized laser Download PDFInfo
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/66—Ring laser gyrometers
- G01C19/661—Ring laser gyrometers details
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Abstract
本发明公开了一种基于超稳激光的被动式激光陀螺仪，包括超稳激光光源装置、高Q值环形腔干涉仪装置和拍频探测装置，激光器输出激光频率锁定至超稳法珀腔谐振峰，同时锁定至链接到原子频标的飞秒光梳，获得兼具短稳与长稳的超稳激光源；环形腔的周长锁定至沿逆时针方向注入的超稳激光源频率上，沿顺时针方向注入的激光频率锁定到腔同一谐振峰上；拍频探测装置探测腔内两个方向溢出光的拍频得到Sagnac信号，通过此信号确定旋转角速度。本发明通过利用超稳激光作为被动式激光陀螺仪注入光源，改善激光陀螺仪干涉信噪比，同时使得陀螺仪的标度因子稳定性可以得到提高，从而提高整个陀螺仪系统的稳定性，延长积分平均时间，以获得更好的转动测量分辨率。
The invention discloses a passive laser gyroscope based on an ultra-stable laser, comprising an ultra-stable laser light source device, a high-Q value ring cavity interferometer device and a beat frequency detection device. , at the same time locked to the femtosecond optical comb linked to the atomic frequency standard to obtain an ultra-stable laser source with both short and long stability; the circumference of the ring cavity is locked to the frequency of the ultra-stable laser source injected in the counterclockwise direction, and the The frequency of the laser injected in the clockwise direction is locked to the same resonance peak of the cavity; the beat frequency detection device detects the beat frequencies of the overflowing light in two directions in the cavity to obtain the Sagnac signal, and the rotation angular velocity is determined by this signal. The invention improves the interference signal-to-noise ratio of the laser gyroscope by using the ultra-stable laser as the passive laser gyroscope injection light source, and at the same time, the stability of the scale factor of the gyroscope can be improved, thereby improving the stability of the whole gyroscope system and prolonging the integral Averaging time for better rotational measurement resolution.
Description
Technical field
The invention belongs to lasergyro fields, swash more particularly, to a kind of passive type based on super stabilized laser technology
Optical gyroscope.
Background technique
Lasergyro is used for inertial navigation, geophysics, basis due to its excellent slewing rate measurement performance
The fields such as physics.In past 40 years, lasergyro has become inertial navigation and precision rotation fields of measurement is most important
Instrument, due to its high resolution, stability is good, dynamic range is wide and the favor by scientific research circle and industry researcher.
Lasergyro is based on Sagnac effect, is proposed in 1913 by French scientist Sagnac, in an annular chamber, if being
There is rotation in the propagation plane of light in system, then the reality that the light propagated clockwise is passed by with the light counterclockwise propagated
Light path is unequal, if two-beam resonates with the same resonance peak of annular chamber simultaneously, the difference of their resonant frequency with
The relationship of angular velocity of rotation can indicate are as follows:Wherein fsagnac is the both direction resonance that we measure
The difference on the frequency of laser, also referred to as Sagnac frequency, whereinReferred to as scale factor, A are the circular areas of annular chamber, and λ is sharp
The wavelength of light, P are the perimeters of annular chamber, and Ω is the angular velocity of rotation of annular chamber.As can be seen that the circular area of lasergyro
Bigger, scale factor is bigger, and measurement sensitivity is higher.
Existing gyroscope is largely active laser gyroscope, i.e., is done by the loop laser that four anti-hysteroscopes of height are constituted
It is full of He-Ne gas gain medium inside interferometer, themselves is exactly an active ring laser, suitable/counterclockwise
The frequency difference of the laser output of direction resonance is Sagnac frequency.This active laser designing gyroscope thought is relatively easy and straight
It connects, limiting factor mostlys come from two aspects at present: one is constrained to the disturbance of spontaneous emission noise and intracavitary medium；Second is that
Dithered and other Frequency-Biasing Techniques for overcoming lasergyro frequency latch-up phenomenon can lose the stabilization of lasergyro
Property.
Passive lasergyro laser source is located at outside annular chamber, can effectively avoid spontaneous emission noise and intracavitary medium
Disturbance, using the method for external modulation also it is possible to prevente effectively from the frequency latch-up phenomenon being widely present in lasergyro.But by
Dynamic formula gyroscope is generally limited by the stability of injection laser source and the stability of itself annular chamber, can neither obtain good rotation
Tarnsition velocity detectivity, can not obtain the very long time of integration averagely obtains good angular velocity of rotation resolution ratio.
In order to solve this problem, patent document CN103047979 B provide it is a kind of using feedback system by the center of laser signal
Frequency Locking is in Fabry Perot chamber resonance frequency, to realize that laser aid output laser linewidth narrows and laser frequency
Stablize, improves the measurement accuracy and sensitivity of the angular velocity of rotation of lasergyro, but it does not solve Fabry Perot chamber
Resonance frequency long term drift problem, the passive type lasergyro integral mean time can be very limited, and in addition to this it does not have yet
Provide passive type lasergyro stabilization or post-processing scheme.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of passive types based on super stabilized laser
Lasergyro, its object is to solve in existing passive type lasergyro due to injection laser noise and Gyroscopic stabilization
Property difference caused by the not high enough problem of detection resolution, pass through and improve passive type lasergyro and inject laser source stability and mark
Factor stability is spent, so that laser linewidth is much smaller than annular chamber line width, lasergyro interference signal signal-to-noise ratio is improved, mentions simultaneously
It is the rotated detection sensitivity of high lasergyro and the longtime running time of integration, final to improve rotated detection resolution ratio.
To achieve the above object, according to one aspect of the present invention, it is sharp to provide a kind of passive type based on super stabilized laser
Optical gyroscope, comprising: super stabilized laser light supply apparatus, high q-factor annular chamber interferometer and beat frequency detection device；It is described super steady sharp
Radiant device includes: laser aid, Fabry Perot chamber device, femtosecond light comb device and atomic frequency standard device；Laser aid
Laser signal, laser letter are provided to the Fabry Perot chamber device, femtosecond light comb device and annular chamber interferometer respectively
Number frequency simultaneously be locked to the Fabry Perot chamber and femtosecond light comb device, at the same time, femtosecond light comb device by itself
Repetition rate and zero bias Frequency Locking are to atomic frequency standard device, so that laser aid final output laser signal frequency has both simultaneously
The short-term stability of Fabry Perot chamber and the long-time stability of atomic frequency standard；The high q-factor annular chamber interferometer is used to
Passive type lasergyro optical interference circuit is constructed, the laser aid exports laser with short-term stabilization for a long time through overfrequency later
Signal divides two-way, respectively in the counterclockwise direction with inject the annular chamber device clockwise；Injection swashs in the counterclockwise direction
The annular chamber device resonance frequency is locked to laser as length standard, by the long frequency locker of the chamber by optical signal
In signal frequency, laser signal is injected along clockwise direction and injects the annular chamber device and laser signal frequency is locked to institute
It states in annular chamber device resonance frequency；Beat frequency detection device is divided within the high q-factor annular chamber interferometer for detecting
The difference Sagnac signal for the laser signal frequency that do not propagate in the counterclockwise direction with clockwise direction determines whole device with this
Angular velocity of rotation.
Wherein, atomic frequency standard device 104 can use stable a reference source to realize, such as in super stabilized laser light supply apparatus 100
Rubidium clock, caesium clock, hydrogen clock, opctical frequency standard etc.；The group of femtosecond light comb device 103 and frequency marking device 104 in super stabilized laser light supply apparatus 100
Conjunction can be replaced with iodine molecule, rubidium atom, Cs atom frequency stabilization system.
Further, passive type lasergyro further include: first laser transmission unit, the first feedback unit, second
Laser transmission unit and the second feedback unit；The first input end of second laser transmission unit is connected to the defeated of femtosecond light comb device
Outlet, the second input terminal of second laser transmission unit are connected to the output end of laser aid, the input terminal of the second feedback unit
It is connected to the output end of second laser transmission unit, the first input end that the output end of the second feedback unit is connected to；First swashs
The input terminal of optical transmission unit is connected to the output end of laser aid, the input/output terminal of first laser transmission unit and connection,
The input terminal of first feedback unit is connected to the output end of first laser transmission unit, and the output end of the first feedback unit is connected to
The second input terminal；First laser transmission unit is used for the laser signal transmission that exports laser aid to the Fabry Perot
Chamber；First feedback unit is used to the laser signal frequency that laser aid exports being locked to the Fabry Perot chamber；Second swashs
Optical transmission unit is used for the laser signal transmission that exports laser aid to the femtosecond light comb device；Second feedback unit is used for
The laser signal frequency that laser aid exports is locked to the femtosecond light comb device.
Further, the frequency of the laser signal of laser aid output by Fabry Perot chamber device and is linked to atom
The femtosecond light comb device of frequency marking is stablized.
Further, the frequency short-term stability of the laser signal of laser aid output is stablized by Fabry Perot chamber,
The beam of laser that laser signal is reflected through the second spectroscope by the first electrooptic modulator phase-modulation, after it is anti-by optoisolator
Fa-Po cavity is injected, which is reflected after interacting with Fa-Po cavity, the detectable signal at the first photodetector, gained
Laser aid is fed back to after the first servo amplifier after error signal demodulation, by laser aid output laser signal frequency lock
Determine onto Fa-Po cavity resonance peak, obtains the superior short-term stability of Fa-Po cavity；The frequency of the laser signal of the laser aid output
Rate long-time stability are stablized by the femtosecond light comb for being linked to atomic frequency standard, and laser signal is reflected a branch of sharp through the first spectroscope
The shoot laser signal of light and the femtosecond light comb device being linked on atomic frequency standard device synthesizes a branch of after third spectroscope
Laser, detects beat signal on the second photodetector, and gained signal feeds back to laser dress after the second servo amplifier
It sets, laser aid output laser signal frequency is locked on the femtosecond light comb device for being linked to atomic frequency standard device, so that swashing
Electro-optical device is provided with the long-time stability of atomic frequency standard.
Further, high q-factor annular chamber interferometer includes: gyro laser preparatory unit, third laser transmission list
Member, the 4th laser transmission unit, annular chamber, third feedback unit, the 4th feedback unit；First laser signal connects gyro laser quasi
The input terminal of standby unit, the first output end of gyro laser preparatory unit are connected to the input terminal of third laser transmission unit, top
The second output terminal of spiral shell laser preparatory unit is connected to the input terminal of the 4th laser transmission unit, third laser transmission unit it is defeated
Enter output end to connect with annular chamber, the input/output terminal of the 4th laser transmission unit is connect with annular chamber；Third feedback unit
Input terminal is connected to the second output terminal of the 4th laser transmission unit, and the input terminal of the 4th feedback unit is connected to third laser
The second output terminal of defeated unit；The output end of third feedback unit is connected to another input terminal of annular chamber, the 4th feedback unit
Output end be connected to another input terminal of the 4th laser transmission unit；Gyro laser preparatory unit is used for first laser signal
It carries out phase-modulation and is divided into two beams；Third laser transmission unit is used for the laser signal for exporting gyro laser preparatory unit
It transmits and is injected into the annular chamber；Another laser that 4th laser transmission unit is used to export gyro laser preparatory unit is believed
Number transmit and be injected into the annular chamber；Annular chamber respectively generates resonance and interferes for two beams injection laser signal；Third is anti-
The error signal servo feedback between laser signal that feedback unit is used to inject by annular chamber resonance peak and in the counterclockwise direction is extremely
Piezoelectric ceramics；The error between laser signal that 4th feedback unit is used to inject by annular chamber resonance peak and along clockwise direction
Signal servo feedback is to second sound-optic modulator.
Further, the long super stabilized laser by injecting in the counterclockwise direction of the chamber of annular chamber is stablized: in the counterclockwise direction
Inject first laser signal and carry out phase-modulation by the second electrooptic modulator, generate after phase-modulation laser carrier signal and
The sideband signals that two amplitude is equal, amplitude is opposite, sideband directly by annular cavity reflection, after carrier wave and chamber interaction with sideband
Third photodetector is reflected by second faraday isolator together, by third photodetector exploring laser light carrier frequency
The mismatching angle of rate and annular chamber resonance peak, demodulation obtain error signal, and final feedback arrives piezoelectric ceramics, to push the 4th high reflection
Rate hysteroscope, the chamber for changing annular chamber is long, and the chamber length of annular chamber is locked in the frequency of injection laser signal counterclockwise.
Further, the super stabilized laser signal injected along clockwise direction passes through second sound-optic modulator, Frequency Locking
Onto the chamber length of the annular chamber, in which: inject laser signal sideband along clockwise direction by annular cavity reflection, carrier wave and chamber phase
The 4th photodetector is reflected by first faraday isolator together with sideband after interaction, by the 4th photodetector
The mismatching angle of exploring laser light carrier frequency and annular chamber resonance peak, demodulation obtain error signal, final feedback to the second acousto-optic tune
Device processed drives voltage controlled oscillator, to change the modulating frequency f of second sound-optic modulator2, so that injecting laser along clockwise direction
Frequency and annular chamber resonance, will inject along clockwise direction the Frequency Locking of laser to annular chamber chamber it is long on.
Further, Sagnac signal both can use the modulation frequency of first sound-optic modulator and second sound-optic modulator
The difference of rate obtains, and also can use and obtains from the spilling photo-beat frequency detection in latter two direction of chamber.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have it is following beneficial to effect
Fruit:
(1) present invention is stabilized to super steady Fabry Perot chamber and chain by the way that passive type lasergyro is injected light source simultaneously
It is connected in the femtosecond light comb of hydrogen clock, so that passive type lasergyro injection light source is had both short-term stability and long-time stability, make
It obtains laser linewidth and is much smaller than annular chamber line width, improve lasergyro interference signal signal-to-noise ratio, improve passive type lasergyro
2-3 order of magnitude of rotated detection sensitivity, while promoting the detection resolution under the long time of integration.
(2) piezoelectric ceramics is loaded on annular chamber wherein one side hysteroscope, is locked to super stabilized laser source using by annular chamber
Method improves the scalefactor stability of lasergyro.
Detailed description of the invention
Fig. 1 is a kind of overall construction drawing of the passive type lasergyro the present invention is based on super stabilized laser；
Fig. 2 is the schematic diagram of a specific embodiment of super stabilized laser light supply apparatus in the present invention；
Fig. 3 is a specific embodiment schematic diagram of high q-factor annular chamber interferometer in the present invention；
Fig. 4 is a specific embodiment schematic diagram of beat frequency detection device in the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The present invention provides a kind of passive type lasergyro based on super stabilized laser, Fig. 1 is a kind of totality of the invention
Structure chart, mainly by super stabilized laser light supply apparatus 100, high q-factor annular chamber interferometer 200 and beat frequency detection device 300.Its
In super stabilized laser light supply apparatus 100 include: laser aid 101, it is Fabry Perot chamber device 102, femtosecond light comb device 103, former
Sub- frequency marking device 104.
Wherein, a part output that laser aid 101 exports laser signal is interacted therewith to Fa-Po cavity device 102
After obtain error signal, error signal feeds back to laser aid 101, and the output laser signal frequency of laser aid 101 is locked
Onto the Fa-Po cavity resonance peak in Fa-Po cavity device 102, the output laser signal frequency to stabilized lasers device 101 is steady in short term
It is qualitative；
The another part that separates that laser aid 101 exports laser signal is exported to femtosecond light comb device 103, femtosecond light comb dress
It sets 103 and has been locked to atomic frequency standard device 104 using the characteristic and device of itself, have the stability of hydrogen clock, laser
Device 101 is output to the laser signal of femtosecond light comb device 103 and the output light action of femtosecond light comb device 103, obtained mistake
Difference signal feeds back to laser aid 101, the output laser signal frequency long-time stability to stabilized lasers device 101；
Specific implementation example according to the present invention, Fa-Po cavity device 102 can be used ultra-high stable Fa-Po cavity, be locked to
The laser signal short-term stability Alan deviation of Fa-Po cavity can be better than 10-12, it is preferable that 10 can be better than-13、10-14、10-15、10-16、10-17Or 10-18；
Hydrogen clock can be used as atomic frequency standard device 104, as a long time surely in specific implementation example according to the present invention
Determine reference source, be linked to hydrogen clock using femtosecond light comb device 103, is locked to the laser signal long-time stability Alan of femtosecond light comb
Deviation can be better than 10-12, it is preferable that 10 can be better than-13、10-14、10-15、10-16；Preferably, other reference sources, such as iodine can be used
Molecule frequency marking, light clock etc., it is preferable that long-time stability can be better than 10-13、10-14、10-15、10-16、10-17、10-18Or 10-19。
Fig. 2 is the schematic diagram of a specific embodiment of super stabilized laser light supply apparatus in the present invention.Attached drawing of the invention
In, heavy line indicates optical path, thick dashed line indication circuit.Super stabilized laser light supply apparatus 100 includes: laser aid 101, Fabry amber
Sieve chamber device 102, femtosecond light comb device 103, atomic frequency standard device 104 and first laser transmission unit 105, the first feedback
First 106, second laser transmission unit 107, the second feedback unit 108；Laser aid 101 is used to provide laser letter to whole system
Number, Fabry Perot chamber device 102 is used for the short-term stability reference source of laser signal, and femtosecond light comb device 103 is sharp for linking
Optical signal and atomic frequency standard output signal, atomic frequency standard device 104 are used for the short-term stability reference source of laser signal, first laser
The laser signal transmission that transmission unit 105 is used to export laser aid 101 to the Fabry Perot chamber 102, first is fed back
Unit 106 is used to the laser signal frequency that laser aid 101 exports being locked to the Fabry Perot chamber 102, second laser
The laser signal transmission that transmission unit 107 is used to export laser aid 101 to the femtosecond light comb device 103, second is fed back
Unit 108 is used to the laser signal frequency that laser aid 101 exports being locked to the femtosecond light comb device 103.
Wherein, laser aid 101 includes: laser 1011 and be arranged on the emitting light path of laser 1011 first point
Light microscopic 1012；Laser 1011 is used to laser being divided into two beams for emitting original laser signal, the first spectroscope 1012；
First laser transmission unit 105 includes: the second spectroscope 1051, the first electrooptic modulator 1052, optoisolator
1053；By laser aid 101 be emitted wherein all the way laser signal by 1051 part of the second spectroscope reflection after passed sequentially through
First electrooptic modulator 1052 and optoisolator 1053 reach enamel amber chamber 102；Second spectroscope 1051 is for part reflection and thoroughly
Laser signal is penetrated, the first electrooptic modulator 1052 is used to carry out phase-modulation to laser signal, and optoisolator 1053 will be for that will swash
Optical signal reflexes to enamel amber chamber 102 and receives the laser signal of the return of enamel amber chamber 102.
First feedback unit 106 includes: the first photodetector 1061 and the first servo amplifier 1062；First photoelectricity is visited
Device 1061 is surveyed to be placed in after optoisolator 1053 for detecting the laser signal returned from enamel amber chamber 102, the first servo amplifier
1062 between the first photodetector 1061 and laser 1011, for this short steady loop error signal demodulation, put
Greatly and servo feedback.
Second laser transmission unit 107 includes: third spectroscope 1071；Third spectroscope 1071 is placed in laser aid 101
Between femtosecond light comb 103, the transmission of the laser signal and 103 output signal of femtosecond light comb that export for laser aid 101 is believed
Number close beam.
Second feedback unit 108 includes: the second photodetector 1081 and the second servo amplifier 1082；Second photoelectricity is visited
It surveys after device 1081 is placed in third spectroscope 1071 and is used for the laser signal and femtosecond light comb 103 that exploring laser light device 101 exports
The beat signal of output signal, the second servo amplifier 1082 then in the second photodetector 1081 and laser 1011 it
Between, the demodulation, amplification and servo feedback of steady loop error signal are grown for this.
Wherein the shoot laser signal of laser 1011 passes through the first spectroscope 1012, gets beam of laser through the second light splitting
It, should by being reflected into Fa-Po cavity 102 by optoisolator 1053 after 1052 phase-modulation of the first electrooptic modulator after the reflection of mirror 1051
Laser signal is reflected after interacting with Fa-Po cavity 102, the detectable signal at the first photodetector 1061, errors letter
Number demodulation after feed back to laser 1011 after the first servo amplifier 1062, by laser aid 101 export laser signal frequency
Rate is locked on 102 resonance peak of Fa-Po cavity, obtains the superior short-term stability of Fa-Po cavity 102；Get another beam of laser and chain
The shoot laser signal for the femtosecond light comb device 103 being connected on hydrogen clock 104 closes beam after third spectroscope 1071, in the second light
Beat signal is detected on electric explorer 1081, gained signal feeds back to laser 1011 after the second servo amplifier 1082,
The output laser signal frequency of laser aid 101 is locked on the femtosecond light comb device 103 for being linked to hydrogen clock 104, so that laser
Device 101 is provided with the long-time stability of hydrogen clock 104；Two-way feeds back while carrying out, and realizes laser aid 101 and exports laser letter
Number long run frequency is stable and short-term frequency stability.
First laser signal is denoted as by the laser signal that the second spectroscope 1051 transmits.First laser signal is supplied to high Q
It is worth annular chamber interferometer 200, is used as passive type lasergyro light source.
In this specific embodiment, laser can be Nd:YAG solid state laser.
According to another embodiment of the present invention, laser can be optical fiber laser.
According to another embodiment of the present invention, hydrogen clock can be replaced by other atomic clocks or light clock or other frequency markings.
Fig. 3 is a specific embodiment schematic diagram of high q-factor annular chamber interferometer 200 in the present invention.Of the invention
In attached drawing, heavy line indicates optical path, thick dashed line indication circuit.High q-factor annular chamber interferometer 200 includes: gyro laser quasi
Standby unit 201, third laser transmission unit 202, the 4th laser transmission unit 203, annular chamber 204, third feedback unit 205,
4th feedback unit 206.Gyro laser preparatory unit 201 is used to first laser signal carrying out phase-modulation and is divided into two
Beam, third laser transmission unit 202 are used for laser signal transmission that gyro laser preparatory unit 201 exports and are injected into described
Annular chamber 204, the 4th laser transmission unit 203 are used for another laser signal transmission for exporting gyro laser preparatory unit 201
And it is injected into the annular chamber 204, annular chamber 204 respectively generates resonance and interferes for two beams injection laser signal, and third is anti-
The error signal servo between laser signal that feedback unit 205 is used to inject by 204 resonance peak of annular chamber and in the counterclockwise direction
Piezoelectric ceramics 2045 is fed back to, the 4th feedback unit 206 is used to swash 204 resonance peak of annular chamber with what is injected along clockwise direction
Error signal servo feedback between optical signal is to second sound-optic modulator 2031.
Wherein, gyro laser preparatory unit 201 includes: the second electrooptic modulator 2011 and first laser signal is arranged in
Half-wave plate 2012 and polarization splitting prism 2013 on emitting light path；Second electrooptic modulator 2011 is for first laser signal
Phase-modulation, half-wave plate 2012 are used to adjust the polarization state of laser signal, and polarization splitting prism 2013 is for believing first laser
Number it is divided into two parts；
Third laser transmission unit 202 includes: first sound-optic modulator 2021, the first reflecting mirror 2022, the first faraday
Isolator 2023；By gyro laser preparatory unit 201 be emitted wherein laser signal passes sequentially through first sound-optic modulator all the way
2021, the first reflecting mirror 2022 and the first faraday isolator 2023 reach annular chamber 204；First sound-optic modulator 2021 is used
In carrying out shift frequency to the laser signal that will inject annular chamber in the counterclockwise direction, the first reflecting mirror 2022 is used for laser signal
Directive property is adjusted, and the first faraday isolator 2023 returns along clockwise direction for being isolated and extracting annular chamber 204
The laser signal of propagation.
4th laser transmission unit 203 includes: second sound-optic modulator 2031 and the second reflecting mirror 2032, the second faraday
Isolator 2033；Second sound-optic modulator is passed sequentially through by the another way laser signal that gyro laser preparatory unit 201 is emitted
2031, the second reflecting mirror 2032 and the second faraday isolator 2033 reach annular chamber 204；Second sound-optic modulator 2031 is used
In carrying out shift frequency to the laser signal that will inject annular chamber along clockwise clockwise, the second reflecting mirror 2032 is used for laser
Signal directive property is adjusted, the second faraday isolator 2033 be used for be isolated and extract annular chamber 204 return along counterclockwise
The laser signal that direction is propagated.
Annular chamber 204 includes: the first high reflectance hysteroscope 2041, the second high reflectance hysteroscope 2042, third high reflectance
Hysteroscope 2043, the 4th high reflectance hysteroscope 2044, piezoelectric ceramics 2045；Wherein the first high reflectance hysteroscope 2041, second is high anti-
It penetrates rate hysteroscope 2042, third high reflectance hysteroscope 2043, the 4th high reflectance hysteroscope 2044 to be arranged successively, constitutes a closure
Square annular chamber 204 respectively generates resonance to two beams injection laser signal and interferes, and piezoelectric ceramics 2045 is arranged the 4th
It is used to that hysteroscope is pushed to change 204 chamber of annular chamber after high reflectance hysteroscope 2044 long.
Third feedback unit 205 includes: third photodetector 2051, third servo amplifier 2052；Third photoelectricity is visited
Device 2051 is surveyed to be placed in after the second faraday isolator 2033 for detecting the propagation in the counterclockwise direction returned from annular chamber 204
Laser signal, third servo amplifier 2052 is between third photodetector 2051 and piezoelectric ceramics 2045, is used for this
Demodulation, amplification and the servo feedback of the long locked loop error signal of chamber.
4th feedback unit 206 includes: the 4th photodetector 2061, the 4th servo amplifier 2062, the second acousto-optic tune
Device processed drives voltage controlled oscillator 2063；4th photodetector 2061 is placed in after the first faraday isolator 2023, Zhi Houyi
The 4th servo amplifier 2062 of secondary connection, second sound-optic modulator drive voltage controlled oscillator 2063, second sound-optic modulator 2031；
4th photodetector 2061 is used to detect the laser signal propagated along clockwise direction returned from annular chamber 204, and the 4th watches
Demodulation, amplification and servo feedback of the amplifier 2062 to this frequency locked loop error signal are taken, second sound-optic modulator drives
Dynamic voltage controlled oscillator 2063 is used to provide driving signal to second sound-optic modulator 2031, and second sound-optic modulator 2031 is for passing through
Cross the shift frequency of its laser signal.
The first laser signal wherein provided by super stabilized laser light supply apparatus 100 is carried out by the second electrooptic modulator 2011
Phase-modulation generates the carrier signal and two sideband signals that amplitude is equal, amplitude is opposite of laser, sideband letter after phase-modulation
Number depend on the modulating frequency of electrooptic modulator 201 with the frequency interval of carrier signal, it is phase modulated after first laser letter
Number two-way laser signal is divided by half-wave plate 2012 and polarization splitting prism 2013, it is anti-by the polarization splitting prism 2013
The laser signal penetrated then passes through first sound-optic modulator shift frequency f1, then pass through the first reflecting mirror 2022 and the first faraday every
From device 2023, inject in the counterclockwise direction high anti-by the first high reflectance hysteroscope 2041, the second high reflectance hysteroscope 2042, third
Penetrate the annular chamber 204 that rate hysteroscope 2043, the 4th high reflectance hysteroscope 2044 and piezoelectric ceramics 2045 are constituted；By the polarization spectro
The laser signal that prism 2013 transmits then passes through second sound-optic modulator shift frequency f2Afterwards, then pass through the second reflecting mirror 2032 and the
Two faraday isolators 2033 inject annular chamber 204 along clockwise direction.
Wherein, the first faraday isolator 2023 and the second faraday isolator 2033 are for extracting side clockwise respectively
Laser signal and counter clockwise direction injection laser signal of the laser through annular cavity reflection to injection laser through annular cavity reflection.Institute
It is better than 60dB with faraday isolator isolation, it is preferable that 90dB can be better than.
Wherein, injection laser signal sideband is directly by annular cavity reflection in the counterclockwise direction, after carrier wave interacts with chamber
Third photodetector 2051 is reflected by second faraday isolator 2033 together with sideband, by third photodetector
The mismatching angle of 2051 exploring laser light carrier frequencies and annular chamber resonance peak, demodulation obtain error signal, and final feedback is made pottery to piezoelectricity
Porcelain 2045, to push the 4th high reflectance hysteroscope 2044, the chamber for changing annular chamber is long, is thus locked to the chamber length of annular chamber
In the frequency of injection laser signal counterclockwise.
Assuming that the frequency of first laser signal is ν0, then the laser frequency propagated in the counterclockwise direction in annular chamber are as follows:
νccw=ν0+f1；Wherein, injection laser signal sideband is equally interacted by annular cavity reflection, carrier wave and chamber along clockwise direction
The 4th photodetector 2061 is reflected by first faraday isolator 2023 together with sideband afterwards, by the 4th photodetection
The mismatching angle of device 2061 exploring laser light carrier frequency and annular chamber resonance peak, demodulation obtain error signal, final feedback to second
Acousto-optic modulator drives voltage controlled oscillator 2063, to change the modulating frequency f of second sound-optic modulator2, so that along side clockwise
It resonates to the frequency and annular chamber of injection laser, thus by the Frequency Locking of injection laser along clockwise direction to annular chamber chamber
In length.Assuming that the frequency of first laser signal is ν0, then the laser frequency propagated along clockwise direction in annular chamber are as follows: νcw
=ν0+f2；First sound-optic modulator 2021 and second sound-optic modulator 2031 are the modulation device of same model, shift frequency direction
Unanimously, so two beam laser all resonate with the same longitudinal mode of annular chamber, due to annular chamber rotation there are them to generate
Frequency shift (FS) is denoted as fsagnac, can indicate are as follows: fsagnac=f1-f2, i.e. first sound-optic modulator 2021 and the second acousto-optic modulation
The difference of 2031 modulating frequency of device is equal to Sagnac frequency.
Fig. 4 is a specific embodiment schematic diagram of beat frequency detection device in the present invention.It include: reflecting mirror 301, reflecting mirror
302, beam cementing prism 303 and the 5th photodetector 304；The setting of reflecting mirror 301 is in third high reflectance hysteroscope 2043 and closes beam
To reflect and adjust spilling laser signal in the counterclockwise direction between prism 303, reflecting mirror 302 is arranged in third high reflection
To reflect and adjust spilling laser signal along clockwise direction, beam cementing prism between rate hysteroscope 2043 and beam cementing prism 303
303 overflow the conjunction beam of laser signal for intracavitary both direction, and the 5th photodetector 304 being placed in after beam cementing prism is used for
Intracavitary both direction overflows the beat frequency detection of laser signal.Its beat frequency is exactly the Sagnac frequency that we need to detect.
The present invention proposes one kind and is based on for detectivity and detection resolution in current large laser gyroscope
The passive type lasergyro of super stabilized laser can further promote the detectivity of passive lasergyro, and to mark
The available raising of factor stability is spent, to improve the stability of entire gyroscope system, long-time integration is obtained and averagely imitates
Fruit, to obtain better rotation measuring resolution ratio.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (8)
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| CN111413859A (en) * | 2020-04-27 | 2020-07-14 | 深港产学研基地（北京大学香港科技大学深圳研修院） | Iodine molecule optical clock based on pulse modulation wide-spectrum comb-tooth laser and control method thereof |
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| CN112857355A (en) * | 2021-01-08 | 2021-05-28 | 华中科技大学 | Passive laser gyroscope based on polarization selection locking and angular velocity determination method |
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| CN111413859B (en) * | 2020-04-27 | 2021-07-02 | 深港产学研基地（北京大学香港科技大学深圳研修院） | Iodine molecule optical clock based on pulse modulation wide-spectrum comb-tooth laser and control method thereof |
| CN111413859A (en) * | 2020-04-27 | 2020-07-14 | 深港产学研基地（北京大学香港科技大学深圳研修院） | Iodine molecule optical clock based on pulse modulation wide-spectrum comb-tooth laser and control method thereof |
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| CN112180394B (en) * | 2020-09-02 | 2023-11-03 | 浙江大学 | A multi-longitudinal mode high spectral resolution laser radar interferometer frequency locking system |
| CN112857355A (en) * | 2021-01-08 | 2021-05-28 | 华中科技大学 | Passive laser gyroscope based on polarization selection locking and angular velocity determination method |
| CN112857355B (en) * | 2021-01-08 | 2022-09-20 | 华中科技大学 | Passive laser gyroscope and angular velocity determination method based on polarization selective locking |
| CN113916211A (en) * | 2021-09-13 | 2022-01-11 | 华中科技大学 | A Passive Laser Gyroscope Based on Critically Coupled Ring Cavity |
| CN113916211B (en) * | 2021-09-13 | 2022-09-27 | 华中科技大学 | Passive laser gyroscope based on critical coupling annular cavity |
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