CN112857591A - Single laser source optical fiber laser system for cold atom interferometer - Google Patents
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 44
- 239000000835 fiber Substances 0.000 claims abstract description 32
- 230000003321 amplification Effects 0.000 claims abstract description 14
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 14
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 8
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- 230000003287 optical effect Effects 0.000 claims description 25
- 230000006641 stabilisation Effects 0.000 claims description 13
- 238000011105 stabilization Methods 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 9
- 229910052701 rubidium Inorganic materials 0.000 claims description 9
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims description 8
- 230000010354 integration Effects 0.000 abstract description 4
- 238000004891 communication Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000001069 Raman spectroscopy Methods 0.000 description 15
- 238000001816 cooling Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 8
- 238000005086 pumping Methods 0.000 description 8
- 230000007704 transition Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005305 interferometry Methods 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
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Abstract
The invention relates to a single laser source fiber laser system for a cold atom interferometer, which comprises a laser source, wherein a modulation amplification module, a frequency doubling module and a laser beam splitting module are sequentially arranged in the laser output direction of the laser source, a frequency stabilizing module is arranged in the laser beam splitting direction of the laser beam splitting module, and the signal output end of the frequency stabilizing module is connected with the input end of the laser source. According to the invention, a single laser source is adopted, so that the design of an interferometer laser system with the laser frequency difference larger than 6.834GHz is realized; the optical fiber laser, the amplifier and the optical fiber component of the communication waveband are adopted, so that the stability and the environmental adaptability are enhanced, and the requirements on miniaturization and integration are met; the light splitting system is skillfully designed, and the laser power utilization rate is improved.
Description
Technical Field
The invention belongs to the technical field of atom precision measurement, relates to an optical fiber laser system, and particularly relates to a single laser source optical fiber laser system for a cold atom interferometer.
Background
Cold atomic interferometry has important applications in atomic precision measurement research. Cold atom gravimeters and gyroscopes based on cold atom interference have extremely high measurement precision in gravity and rotation measurement, and show great development potential. But the cold atom interferometer has extremely high difficulty in moving and dynamic measurement due to a huge vacuum system, a complex optical path system and a circuit system. In recent years, with the continuous development of laser technology, optical component technology and atomic control technology, portable cold atomic gravimeters and gyroscopes have been developed by many groups at home and abroad.
Miniaturization and integration of laser systems are the basis for portability and dynamic measurement of cold atom interferometers. However, the cold atom interferometer needs to cool laser light, probe light, re-pump light, blow-off light, raman light and other lasers with various frequencies, and various lasers need to be switched on and off rapidly in real time, so that the laser system inevitably needs to enable the laser and various optical components to achieve output and real-time control of various lasers. In a traditional cold atom interferometer laser system, two lasers are used for respectively realizing two different laser frequency requirements needed in Raman laser, and the generation and real-time control of cooling light, re-pumping light, detecting light and blowing light are realized through frequency shift of an acousto-optic modulator, because two frequency differences needed by the Raman light are in GHz level, one laser is extremely difficult to realize the output and real-time control of the two frequency lasers.
With the development of optical technology and the more mature miniaturization technology of optical devices, the volume and the number of lasers in the cold atom interferometer have become the most important factors limiting the miniaturization of laser systems. Therefore, the independent development of miniaturized lasers and the reasonable design of laser systems, and the reduction of the number of the lasers is the key of the miniaturization of the current laser systems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a single laser source optical fiber laser system for a cold atom interferometer, which is suitable for miniaturization and integration requirements.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the utility model provides a single laser source fiber laser system for cold atom interferometer, includes the laser source, is equipped with modulation amplification module, doubling of frequency module and laser beam splitting module in proper order in the laser output direction of laser source, is equipped with the frequency stabilization module in the laser beam splitting direction of laser beam splitting module, and the signal output part of this frequency stabilization module is connected with the input of laser source.
And the laser source comprises a fiber laser and a fiber isolator, the signal input end of the fiber laser is connected with the signal output end of the frequency stabilization module, the fiber isolator is arranged in the laser output direction of the fiber laser, and the modulation amplification module is arranged in the laser output direction of the fiber isolator.
And the modulation amplification module comprises an optical fiber electro-optic modulator and an optical fiber amplifier, and the optical fiber electro-optic modulator and the optical fiber amplifier are sequentially arranged in the laser output direction of the laser source.
And the frequency doubling module comprises a first optical fiber collimator, a first focusing lens, a periodically polarized PPLN crystal, a second focusing lens, a bandwidth beam splitter and an optical DUMP, wherein the first optical fiber collimator, the first focusing lens, the periodically polarized PPLN crystal, the second focusing lens and the bandwidth beam splitter are sequentially arranged in the laser output direction of the modulation amplification module, the optical DUMP is arranged in the laser transmission direction of the bandwidth beam splitter, and the laser beam splitter is arranged in the laser reflection direction of the bandwidth beam splitter.
The laser beam splitting module comprises a first lambda/2 wave plate, a first polarization beam splitter prism, a first 0-45 degree reflector, a first acousto-optic modulator, a second 0-45 degree reflector, a second acousto-optic modulator, a third 0-45 degree reflector, a third acousto-optic modulator, a fourth 0-45 degree reflector, a second optical collimator and a mechanical switch, wherein the first lambda/2 wave plate and the first polarization beam splitter prism are sequentially arranged in the laser output direction of the frequency doubling module, the second optical collimator and the frequency stabilizing module are sequentially arranged in the laser reflection direction of the first polarization beam splitter, the first 0-45 degree reflector is arranged in the laser transmission direction of the first polarization beam splitter, the first acousto-optic modulator is arranged in the laser reflection direction of the first 0-45 degree reflector, and the second 0-45 degree reflector is arranged in the primary output direction of the first acousto-optic modulator The second acousto-optic modulator is arranged in the output direction of the zeroth order diffraction light of the first acousto-optic modulator, the third 0-45 degree reflector is arranged in the output direction of the first order diffraction light of the second acousto-optic modulator, the third acousto-optic modulator is arranged in the output direction of the zeroth order diffraction light of the second acousto-optic modulator, the fourth 0-45 degree reflector is arranged in the output direction of the first order diffraction light of the third acousto-optic modulator, and the mechanical switch is arranged in the output direction of the zeroth order diffraction light of the third acousto-optic modulator.
Moreover, the frequency stabilization module comprises a fifth 0-45 degree reflector, a sixth 0-45 degree reflector, a phase electro-optic modulator, a second lambda/2 wave plate, a second polarization beam splitter prism, a rubidium bubble, a lambda/4 wave plate, a 780nm optical filter, a seventh 0-45 degree reflector, a photoelectric detector, a dual-channel signal source, a frequency mixer and a phase discriminator, wherein the fifth 0-45 degree reflector is arranged in the laser beam splitting direction of the laser beam splitter module, the sixth 0-45 degree reflector is arranged in the laser reflecting direction of the fifth 0-45 degree reflector, the phase electro-optic modulator, the second lambda/2 wave plate and the second polarization beam splitter prism are sequentially arranged in the laser reflecting direction of the sixth 0-45 degree reflector, the second polarization beam splitter prism is reversely arranged, and the rubidium bubble, the lambda/4 wave plate, the phase electro-optic modulator, the second lambda/2 wave plate and the second polarization beam splitter prism are sequentially arranged in the laser reflecting direction of, 780nm light filter and seventh 0-45 speculum setting are on the laser transmission direction of second polarization beam splitting prism, the plane of reflection of seventh 0-45 speculum is mutually perpendicular with the output laser of 780nm light filter, photoelectric detector sets up on the laser reflection direction of second polarization beam splitting prism, the signal input part of mixer links to each other with photoelectric detector's signal output part, the signal input part of phase discriminator links to each other with the signal output part of mixer, the signal output part of phase discriminator links to each other with the laser source, the signal output part of binary channels signal source links to each other with the signal input part of mixer and the signal input part of phase position electro-optic modulator respectively.
The invention has the advantages and positive effects that:
1. the invention realizes the laser output function required by the cold atom interferometer by the fiber laser and the fiber amplifier of a single communication waveband and by utilizing the frequency doubling technology, and optical components used in the system are mostly fiber components, thereby having important significance for the miniaturization and integration of the laser system of the cold atom interferometer.
2. The 1560nm fiber laser is used as seed laser, the frequency of the laser is modulated by an electro-optical modulator (EOM), the generated Raman laser with the frequency difference of 6.834GHz is constant in phase difference; 1560nm laser with power of 10W is generated after passing through an optical fiber amplifier, and 780nm laser with 2W is generated by single pass of periodic polarization lithium niobate crystal (PPLN) crystal frequency doubling for realizing cold atom interference.
3. According to the invention, different frequency output functions of cooling light, detecting light, blowing light, Raman light and the like are realized through rapid frequency hopping of the electro-optic modulator and frequency shifting of the electro-optic modulator; processing the processes of atom capture, atomic state preparation, interference and detection through laser time-sharing multiplexing; zero-order light of an acousto-optic modulator (AOM) of a beam splitting module is used as input light, and a time division multiplexing technology is combined, so that the maximum utilization of laser power is realized, and meanwhile, the automatic adjusting function of system power is increased.
4. The invention realizes the real-time adjustment function of the laser power by using the zero-order output light of the acousto-optic modulator as the next-stage input light and combining the amplitude modulation technology and the quick switching function of the acousto-optic modulator on the diffracted light, thereby optimizing the laser parameters in the interference process in real time and simultaneously improving the laser utilization rate.
Drawings
FIG. 1 is a single laser source fiber laser system of the cold atom interferometer of the present invention.
Fig. 2 is a light path diagram of a laser frequency stabilization system.
FIG. 3 is a schematic diagram of laser frequency of a cold atom interferometer.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
The utility model provides a single laser source fiber laser system for cold atom interferometer, as shown in figure 1, includes laser source, modulation amplification module, frequency multiplication module, frequency stabilization module and laser beam splitting module, is equipped with modulation amplification module, frequency multiplication module and laser beam splitting module in proper order in the laser output direction of laser source, is equipped with the frequency stabilization module in the laser beam splitting direction of laser beam splitting module, and the signal output part of frequency stabilization module is connected with the laser source.
The laser source comprises an optical fiber laser 101 and an optical fiber isolator 102, a signal input end of the optical fiber laser 101 is connected with a signal output end of the frequency stabilization module, the optical fiber isolator 102 is arranged in the laser output direction of the optical fiber laser 101, and a modulation amplification module is arranged in the laser output direction of the optical fiber isolator 102.
The modulation amplification module comprises an optical fiber electro-optic modulator 201 and an optical fiber amplifier 202, and the optical fiber electro-optic modulator 201 and the optical fiber amplifier 202 are sequentially arranged in the laser output direction of the optical fiber isolator 102.
The frequency doubling module comprises a first optical fiber collimator 301, a first focusing lens 302, a periodically polarized PPLN crystal 303, a second focusing lens 304, a bandwidth beam splitter 305 and an optical DUMP306, wherein the first optical fiber collimator 301, the first focusing lens 302, the periodically polarized PPLN crystal 303, the second focusing lens 304 and the bandwidth beam splitter 305 are sequentially arranged in the laser output direction of the optical fiber amplifier 202, the optical DUMP306 is arranged in the laser transmission direction of the broadband beam splitter 305, and the laser beam splitting module is arranged in the laser reflection direction of the broadband beam splitter 305.
The laser beam splitting module comprises a first lambda/2 wave plate 501, a first polarization beam splitting prism 502, a first 0-45 degree reflector 503, a first acousto-optic modulator 504, a second 0-45 degree reflector 505, a second acousto-optic modulator 506, a third 0-45 degree reflector 507, a third acousto-optic modulator 508, a fourth 0-45 degree reflector 509, a second optical fiber collimator 511 and a mechanical switch 510, wherein a polarization first lambda/2 wave plate 501 and a first polarization beam splitting prism 502 are sequentially arranged in the laser reflection direction of the broadband beam splitting mirror 305, a second optical fiber collimator 511 and a frequency stabilizing module are sequentially arranged in the laser reflection direction of the first polarization beam splitting mirror 502, the first 0-45 degree reflector 503 is arranged in the laser transmission direction of the first polarization beam splitting mirror, the first acousto-optic modulator 504 is arranged in the laser reflection direction of the first 0-45 degree reflector, a second 0-45 degree mirror 505 is provided in the first order diffraction light output direction of the first acousto-optic modulator 504, a second acousto-optic modulator 506 is provided in the zero order diffraction light output direction of the first acousto-optic modulator 504, a third 0-45 degree mirror 507 is provided in the first order diffraction light output direction of the second acousto-optic modulator 506, a third acousto-optic modulator 508 is provided in the zero order diffraction light output direction of the second acousto-optic modulator 506, a fourth 0-45 degree mirror 509 is provided in the first order diffraction light output direction of the third acousto-optic modulator 508, and a mechanical switch 510 is provided in the zero order diffraction light output direction of the third acousto-optic modulator 508.
The frequency stabilizing module is shown in fig. 2, and includes a fifth 0-45 ° reflector 401, a sixth 0-45 ° reflector 402, a phase electro-optic modulator 403, a second λ/2 wave plate 404, a second polarization beam splitter prism 405, a rubidium bubble 406, a λ/4 wave plate 407, a 780nm filter 408, a seventh 0-45 ° reflector 409, a photodetector 410, a dual-channel signal source 411, a mixer 412, and a phase discriminator 413, the fifth 0-45 ° reflector 401 is disposed in a laser output direction of the second fiber collimator 511, the sixth 0-45 ° reflector 402 is disposed in a laser reflection direction of the fifth 0-45 ° reflector 401, the phase electro-optic modulator 403, the second λ/2 wave plate 404, and the second polarization beam splitter prism 405 are sequentially disposed in a laser reflection direction of the sixth 0-45 ° reflector 402, and the second polarization beam splitter prism is disposed in a reverse direction, a rubidium bubble 406, a lambda/4 wave plate 407, a 780nm optical filter 408 and a seventh 0-45 degree reflector 409 are arranged in the laser transmission direction of the second polarization beam splitter prism, the reflection surface of the seventh 0-45 degree reflector 409 is perpendicular to the output laser of the 780nm optical filter 408, a photoelectric detector 410 is arranged in the laser reflection direction of the second polarization beam splitter prism 405, the signal output end of the photoelectric detector 410 is connected with the signal input end of a mixer 412, the signal output end of the mixer 412 is connected with the signal input end of a phase discriminator 413, the signal output end of the phase discriminator 413 is connected with the signal input end of the optical fiber laser 101, and the signal output end of a dual-channel signal source 411 is respectively connected with the signal input end of the mixer 412 and the signal input end of the phase electro-optic modulator 403.
As shown in FIG. 3, the experimental basis87The Laser required by Rb cold atom interferometer comprises Cooling light (Cooling Laser),And 7 different lasers including pumping Laser (Laser), Probe Laser (Probe Laser), Blow-off Laser 1(Blow Laser), Blow-off Laser 2, Raman Laser 1(Raman Laser) and Raman Laser 2. Red detuning of cooling light frequency87Rb atom 52S1/2,F＝2-52P3/2F ═ 3 transition line 2 Γ -6 Γ (Γ is 5 Γ)2P3/2The energy level linewidth of F ═ 3, about 6 MHz); the re-pumping light resonates at 52S1/2,F＝1-52P3/2F ═ 2 transition, to be at 52S1/2The atom in the F-1 state being pumped to 52P3/2In the 2-state; the probe light is used for detecting atom interference signal with frequency resonance at 52S1/2,F＝2-52P3/2F ═ 3 transitions; in the atomic state control process, microwave and laser selection 5 with corresponding frequency are required to act2S1/2,F＝2,m F0 atoms, blow 1 at the same frequency as the re-pump light, for the remaining F1, mFBlowing away atoms not equal to 0 for atom state selection; the blow-off beam 2 has the same frequency as the probe beam and is used to convert the remaining F into 2, mFAnd blowing away the atoms not equal to 0 to select the state of the atoms. The Raman light 1 and the Raman light 2 are main lasers for realizing atomic interference, the frequency difference of the two beams of laser is 6.834GHz, and the coupling is 52S1/2,F＝1-52S1/2F2 transition, a two-photon transition, with both lasers being far detuned to 52S1/2-52P3/2About 600 MHz.
The specific control process and optical path transmission process of the invention are as follows:
1560nm laser output by the optical fiber laser 101 passes through the optical fiber isolator 102, then a sideband with 6.834GHz is applied by the optical fiber electro-optic modulator 201, the high-power 1560nm laser is generated by the optical fiber amplifier 202, the laser is output through the first optical fiber collimator 301, then frequency multiplication is performed by the first focusing lens 302, the periodically polarized PPLN crystal 303 and the second focusing lens 304 to generate 780nm laser, the 780nm laser is filtered out after passing through the 780nm reflection/1560 nm transmission bandwidth beam splitter 305 and enters a laser beam splitting module for a cold atom interferometer, and the 1560nm laser is collected by the optical DUMP306 after passing through the broadband beam splitter 305. In the laser beam splitting module, 780nm laser is firstly split by a first lambda/2 wave plate 501 and a first polarization beam splitting prism 502, reflected light of the first polarization beam splitting prism 502 is coupled by a second optical fiber collimator 511 to build a frequency stabilization module, transmitted light of the first polarization beam splitting prism 502 is reflected by a 0-45 DEG reflector 503 to enter a first acousto-optic modulator 504, the modulation frequency is about 78.5MHz, first-order diffracted light of the first polarization beam splitting prism is reflected by a second 0-45 DEG reflector 505 to be output to be used as cooling light and re-pumping light, zero-order diffracted light enters a second acousto-optic modulator 506, the modulation frequency is about 700MHz, first-order diffracted light of the first polarization beam splitting prism is reflected by a third 0-45 DEG reflector 507 to be output to be used as Raman light 1 and Raman light 2, the zero-order diffracted light enters a third acousto-optic modulator 508, the modulation frequency is about 78.5MHz, and first-order diffracted light of the first order diffracted light of, Blow away light 1 and blow away light 2, the zero order diffracted light is switched by the mechanical switch 510 to be used as the re-pumping light for the atomic polarization gradient cooling process. And each laser required by the system enters a sensing head of the atomic interferometer to realize the atomic interferometer.
780nm laser in a frequency stabilization module is reflected by a fifth 0-45 degree reflector 401 and a sixth 0-45 degree reflector 402 and then modulated by a 12.5MHz phase electro-optic modulator 403, output laser is subjected to polarization selection by a second lambda/2 wave plate 404 and a second polarization beam splitter 405, the laser passes through a rubidium bubble 406 and a lambda/4 wave plate 407, is attenuated by a 780nm filter 408, is reflected by a seventh 0-45 degree reflector 409 and passes through the rubidium bubble 406, is reflected by the second polarization beam splitter 405, collects optical signals by a photoelectric detector 410 and converts the optical signals into electric signals, mixes the electric signals with reference signals output by a dual-channel signal source 411 by a mixer 412, phase discrimination is performed by a phase discriminator 413, outputs voltage signals to control a fiber laser 101 to lock laser frequency, and locks the laser frequency at 5 primary frequency2S1/2,F＝1-52P3/2And F' is on the 1, 2 cross line.
The system frequency control of the invention is as follows:
in the atom cooling and capturing stage, the modulation frequency of the optical fiber electro-optic modulator 201 is 6.583GHz, so that the accuracy of the cooling light frequency and the frequency of the re-pumping light is ensured, and atom cooling and capturing are realized;
in the polarization gradient cooling stage, the modulation frequency of the fiber electro-optic modulator 201 jumps from 6.583GHz to 6.683GHz, and meanwhile, the first acousto-optic modulator 504 reduces the power of radio frequency signals to further cool the atomic temperature;
in the phase of selecting state, the modulation frequency of the fiber electro-optic modulator 201 jumps to 6.599GHz/6.468GHz, while the frequency of the third acousto-optic modulator 508 changes to 110MHz/78.5MHz, so as to obtain the blown light 1 and the blown light 2 with corresponding frequencies, and the third acousto-optic modulator 508 performs laser switching and time division multiplexing;
in the atomic interference stage, the fiber electro-optical modulator 201 modulates the frequency jump of 6.834GHz, so as to ensure that the Raman light 1 and the Raman light 2 are coupled 52S1/2,F＝1-52S1/2F2 transition while shifting the laser frequency by 700MHz through the second acousto-optic modulator 506, avoiding 52S1/2-52P3/2The energy level transition of (a) affects atomic interference and performs fast switching.
In the atomic signal detection stage, the modulation frequency of the fiber electro-optical modulator 201 jumps to 6.568GHz to obtain the corresponding frequency detection light and the re-pumping light, and the binary detection is performed.
The method for realizing the power control of the laser beam splitting module comprises the following steps:
by controlling the power of the radio frequency signal of the first acousto-optic modulator 504 in real time, the laser power of the cooling light and the re-pumping light can be controlled, and the laser power of the Raman light 1 and the laser power of the Raman light 2 can be controlled;
by controlling the power of the radio frequency signal of the second acousto-optic modulator 506 in real time, the laser power of the raman light 1 and the raman light 2 can be controlled, and the laser power of the probe light, the blow-off light 1 and the blow-off light 2 can be controlled at the same time.
In the above embodiment, the frequency value is not an accurate value, but a frequency value near the frequency, and a specific frequency value is determined according to an experimental situation, which is not limited in the embodiment of the present invention.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept, and these changes and modifications are all within the scope of the present invention.
Claims (6)
1. A single laser source fiber laser system for a cold atom interferometer, comprising a laser source, characterized in that: the laser beam splitting device comprises a laser source, a modulation amplification module, a frequency doubling module and a laser beam splitting module, wherein the modulation amplification module, the frequency doubling module and the laser beam splitting module are sequentially arranged in the laser output direction of the laser source, the frequency stabilizing module is arranged in the laser beam splitting direction of the laser beam splitting module, and the signal output end of the frequency stabilizing module is connected with the input end of the laser source.
2. The single laser source fiber laser system for a cold atom interferometer of claim 1, wherein: the laser source comprises a fiber laser and a fiber isolator, the signal input end of the fiber laser is connected with the signal output end of the frequency stabilization module, the fiber isolator is arranged in the laser output direction of the fiber laser, and the modulation amplification module is arranged in the laser output direction of the fiber isolator.
3. The single laser source fiber laser system for a cold atom interferometer of claim 1, wherein: the modulation amplification module comprises an optical fiber electro-optic modulator and an optical fiber amplifier, and the optical fiber electro-optic modulator and the optical fiber amplifier are sequentially arranged in the laser output direction of the laser source.
4. The single laser source fiber laser system for a cold atom interferometer of claim 1, wherein: the frequency doubling module comprises a first optical fiber collimator, a first focusing lens, a periodically polarized PPLN crystal, a second focusing lens, a bandwidth beam splitter and an optical DUMP, wherein the first optical fiber collimator, the first focusing lens, the periodically polarized PPLN crystal, the second focusing lens and the bandwidth beam splitter are sequentially arranged in the laser output direction of the modulation amplification module, the optical DUMP is arranged in the laser transmission direction of the bandwidth beam splitter, and the laser beam splitter is arranged in the laser reflection direction of the bandwidth beam splitter.
5. The single laser source fiber laser system for a cold atom interferometer of claim 1, wherein: the laser beam splitting module comprises a first lambda/2 wave plate, a first polarization beam splitter prism, a first 0-45 degree reflector, a first acousto-optic modulator, a second 0-45 degree reflector, a second acousto-optic modulator, a third 0-45 degree reflector, a third acousto-optic modulator, a fourth 0-45 degree reflector, a second optical collimator and a mechanical switch, wherein the first lambda/2 wave plate and the first polarization beam splitter prism are sequentially arranged in the laser output direction of the frequency doubling module, the second optical collimator and the frequency stabilizing module are sequentially arranged in the laser reflection direction of the first polarization beam splitter, the first 0-45 degree reflector is arranged in the laser transmission direction of the first polarization beam splitter, the first acousto-optic modulator is arranged in the laser reflection direction of the first 0-45 degree reflector, the second 0-45 degree reflector is arranged in the first-order diffraction light output direction of the first acousto-optic modulator, the second acousto-optic modulator is arranged in the output direction of the zero-order diffraction light of the first acousto-optic modulator, the third 0-45 degree reflector is arranged in the output direction of the first-order diffraction light of the second acousto-optic modulator, the third acousto-optic modulator is arranged in the output direction of the zero-order diffraction light of the second acousto-optic modulator, the fourth 0-45 degree reflector is arranged in the output direction of the first-order diffraction light of the third acousto-optic modulator, and the mechanical switch is arranged in the output direction of the zero-order diffraction light of the third acousto-optic modulator.
6. The single laser source fiber laser system for a cold atom interferometer of claim 1, wherein: the frequency stabilization module comprises a fifth 0-45 degree reflector, a sixth 0-45 degree reflector, a phase electro-optic modulator, a second lambda/2 wave plate, a second polarization beam splitter prism, a rubidium bubble, a lambda/4 wave plate, a 780nm optical filter, a seventh 0-45 degree reflector, a photoelectric detector, a dual-channel signal source, a frequency mixer and a phase discriminator, wherein the fifth 0-45 degree reflector is arranged in the laser beam splitting direction of the laser beam splitter module, the sixth 0-45 degree reflector is arranged in the laser reflecting direction of the fifth 0-45 degree reflector, the phase electro-optic modulator, the second lambda/2 wave plate and the second polarization beam splitter prism are sequentially arranged in the laser reflecting direction of the sixth 0-45 degree reflector, the second polarization beam splitter prism is reversely arranged, and the rubidium bubble, the lambda/4 wave plate, the 780nm optical filter and the seventh 0-45 degree reflector are arranged in the laser transmission direction of the second polarization beam splitter prism In the direction, the plane of reflection of seventh 0-45 speculum is mutually perpendicular with the output laser of 780nm light filter, photoelectric detector sets up on the laser reflection direction of second polarization beam splitting prism, the signal input part of mixer links to each other with photoelectric detector's signal output part, the signal input part of phase discriminator links to each other with the signal output part of mixer, the signal output part of phase discriminator links to each other with laser source, the signal output part of binary channels signal source links to each other with the signal input part of mixer and phase position electro-optic modulator's signal input part respectively.
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| CN202110026456.5A CN112857591B (en) | 2021-01-08 | 2021-01-08 | Single laser source optical fiber laser system for cold atom interferometer |
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