CN111834866A - Plug-in type frequency stabilizer - Google Patents
Plug-in type frequency stabilizer Download PDFInfo
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- CN111834866A CN111834866A CN202010658396.4A CN202010658396A CN111834866A CN 111834866 A CN111834866 A CN 111834866A CN 202010658396 A CN202010658396 A CN 202010658396A CN 111834866 A CN111834866 A CN 111834866A
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- 239000003381 stabilizer Substances 0.000 title claims description 10
- 230000003287 optical effect Effects 0.000 claims abstract description 69
- 238000001228 spectrum Methods 0.000 claims abstract description 18
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- 238000012546 transfer Methods 0.000 claims abstract description 17
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 5
- 230000010287 polarization Effects 0.000 claims description 90
- 229910052701 rubidium Inorganic materials 0.000 claims description 53
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims description 52
- 230000008878 coupling Effects 0.000 claims description 36
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
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Abstract
The invention discloses an instant-inserting type laser frequency stabilizing device which comprises a main body frame, and a laser module, a beam combining and splitting module, a frequency spectrograph and a modulation transfer spectrum frequency stabilizing module which are arranged on the main body frame. Laser generated by the laser module is split by the beam combining and splitting module and then enters the frequency spectrograph and the modulation transfer spectrum frequency stabilization module, and generated signals are processed and fed back to the laser module to finish frequency stabilization. The invention has the advantages of strong anti-interference capability to the external environment, stable structure, small occupied space and easy construction; meanwhile, due to the characteristic of easy backup, the upgrading and maintenance of the optical system can be completed rapidly, and the requirement of long-term continuous and stable operation of a large-scale optical system is met.
Description
Technical Field
The invention is used in the field of atomic molecular photophysics research, and particularly relates to an instant insertion type frequency stabilizing device.
Background
There are two main modes of operation of optical systems currently in common use in the art: an optical system mainly comprising an optical adjustment frame and disposed on a flat surface of an optical platform, such as the literature (Characterisation and optimization of a belt feeder by spectra spot a long multi-pass rubber absorption cell, ChaoZhou et al, applied optics, Vol.57, P7427-P7434, 2018); another approach is to integrate the entire optical system into one optical box to become a dedicated instrument optical system, such as the literature (compact laser system for mobile communication meters, Xiaooei Zhang et al, applied optics, Vol.57, pp.6545-6552, 2018).
The first conventional optical platform system has a large adjustable and improved space, and is suitable for optical systems for scientific research purposes, but has many disadvantages. Firstly, most of optical devices of the traditional optical system are fixed through screws, the stability of the optical devices is poor, and the whole optical system is placed on a larger optical platform, so that the requirements on environment monitoring, feedback and control are higher, and the adverse effect on an experimental system caused by the change of environmental factors is larger; environmental control is also difficult due to the large space. Maintaining stability for precision measurement, a system that requires long integration measurements, is a challenge. Secondly, the traditional optical system lacks a uniform standard due to the flexible improvement characteristic, the structure of the experimental optical system is often different from person to person, the repeatability is poor, the solidification of experimental parameters is not facilitated, and the long-term accumulation of experience technology is also not facilitated; meanwhile, the technical requirements on experimenters are also high. Third, the conventional platform optical system is poor in portability and upgradability, and when an experiment site needs to be changed or an experiment system needs to be upgraded, the assembled optical system needs to be rebuilt, which consumes a lot of time and energy of researchers.
The second special instrument optical system has very good stability and reliability, but can only be applied to certain specific optical systems, so that the requirement of adjustability and optimization on the optical system in research experiments is difficult to meet. The optical system structure integrated in the box is fixed and changes little space, resulting in poor adjustability and upgradeability of the optical system. One set of optical system can only be matched with one experiment basically, and the application range is narrow; meanwhile, the whole optical system needs to be built again when the optical system is upgraded, so that the use cost is high; in addition, once a fault occurs, the whole system needs to be maintained, which is long in time, so that the experimental system is difficult to continuously operate for a long time. Taking a large-scale Long-baseline atomic Interferometer as an example, see the literature (ZAIGA: Zhaoshan Long-baseline Interferometer gravity Interferometer Antenna, Ming-Sheng Zhan, etc., International Journal of model Physics D volume 28 (1940005), pages 1-20, 2019), the system is 300 meters Long and requires a total of 6 different atomic interferometers of 2 or more elements to be operated simultaneously. This requires the construction of large and complex optical systems at multiple locations in the system while ensuring long-term continuous operation. Due to aging of a complex optical system, etc., system interruption due to malfunction of the optical system frequently occurs. Therefore, the optical system for rapidly replacing the fault part is an important means for ensuring the efficient operation of the large-scale atomic interferometer. The design of the functional module is also beneficial to synchronously improving and optimizing the system when the system runs integrally.
The laser frequency stabilization module is designed to meet the requirements of building a large optical system in the future and integrate the advantages of a traditional platform optical system and a special instrument optical system. According to the use characteristics of the seed optical laser, the whole frequency stabilization optical system is integrated in a box by using two frequency stabilization modes of beat frequency phase-locked frequency stabilization and modulation transfer spectrum frequency stabilization. The structure has the advantages of strong anti-interference capability to the external environment, stable structure, small occupied space and easy construction; meanwhile, due to the characteristic of easy backup, the upgrading and maintenance of the optical system can be completed rapidly, and the requirement of long-term continuous and stable operation of a large-scale optical system is met.
Disclosure of Invention
The invention aims to provide an instant-insertion frequency stabilizer aiming at the defects in the prior art, and solves the defects of non-standard, difficult maintenance, difficult transportation, large occupied space and the like of the existing optical system.
The purpose of the invention is realized as follows:
an instant insertion type frequency stabilizer comprises a main body frame, a laser module and a beam combining and splitting module are arranged on the main body frame,
the laser module comprises a laser, an isolator, a phase retarder and a first polarization beam splitter prism,
the beam combining and splitting module comprises a first fixed phase retarder, a second polarization beam splitter prism, a second fixed phase retarder, a third polarization beam splitter prism, a fifth fixed phase retarder, a third fixed phase retarder, a fourth polarization beam splitter prism, a sixth fixed phase retarder, a fourth fixed phase retarder, a fifth polarization beam splitter prism, a seventh fixed phase retarder and a first photoelectric detector,
the laser generated by the laser passes through the isolator, the phase retarder and the first polarization beam splitter prism in sequence, is reflected by the first reflector, is modulated by the first fixed phase retarder, passes through the second polarization beam splitter prism, is divided into two beams, the transmission light split by the second polarization beam splitter prism is coupled into the first coupling head and then enters the modulation transfer spectrum frequency stabilization module, the reflection light split by the second polarization beam splitter prism passes through the second fixed phase retarder and then is divided into two beams by the third polarization beam splitter prism, the reflection light split by the third polarization beam splitter prism passes through the fifth fixed phase retarder and then is coupled into the second coupling head and then is emitted, the transmission light split by the third polarization beam splitter prism passes through the third fixed phase retarder and then transmits the fourth polarization beam splitter prism to form first to-be-combined beam, and the laser with the same frequency as the laser emitted by the laser is emitted from the third coupling head, passes through the sixth fixed phase retarder and then is reflected by the fourth polarization beam splitter prism to form the second to-be-combined beam And the beam to be combined, a first beam to be combined and a second beam to be combined form combined beam laser, the combined beam laser is divided into two beams by a fifth polarization beam splitter prism after passing through a fourth fixed phase retarder, reflected light split by the fifth polarization beam splitter prism is coupled into a fourth coupling head after passing through a seventh fixed phase retarder and then emitted out, transmitted light split by the fifth polarization beam splitter prism is coupled into a first photoelectric detector after being reflected by a second reflector and then detected to obtain a detection signal, the obtained detection signal enters a frequency spectrograph for beat frequency phase locking and generates a frequency locking feedback signal, and the frequency locking feedback signal is fed back to a control cabinet of the laser.
The modulation transfer spectrum frequency stabilization module as described above includes an eighth fixed phase retarder,
laser emitted by the first coupling head enters the fifth coupling head, then sequentially passes through the eighth fixed phase retarder, the third reflector and the ninth fixed phase retarder, then is divided into two beams by the sixth polarization beam splitter prism, transmitted light split by the sixth polarization beam splitter prism is expanded by the first lens and the second lens to form first rubidium bubble incident light which enters the rubidium bubble, the first rubidium bubble incident light passes through the rubidium bubble, then enters the seventh polarization beam splitter prism by the tenth fixed phase retarder, is transmitted by the seventh polarization beam splitter prism, then is reflected and coupled into the second photoelectric detector by the fourth reflector, a detection signal obtained by the second photoelectric detector passes through the amplifier, the filter and the PID controller in turn and then is fed back to a control cabinet of the laser, reflected light passing through the sixth polarization beam splitter prism passes through the fifth reflector, the electro-optic modulator, the third lens, the sixth reflector and the fourth lens, then enters the seventh polarization beam splitter prism by the eleventh fixed phase retarder, and then reflected by a seventh polarization splitting prism to form second rubidium bubble incident light, wherein the second rubidium bubble incident light enters the rubidium bubble, and the second rubidium bubble incident light and the first rubidium bubble incident light share the same optical axis and are opposite in direction.
The modulation transfer spectrum frequency stabilization module as described above includes an eighth fixed phase retarder,
laser emitted by the first coupling head enters the fifth coupling head, then sequentially passes through the eighth fixed phase retarder, the third reflector and the ninth fixed phase retarder, then is divided into two beams by the sixth polarization beam splitter prism, transmitted light split by the sixth polarization beam splitter prism forms first rubidium bubble incident light which enters the rubidium bubble, the first rubidium bubble incident light passes through the rubidium bubble, then enters the seventh polarization beam splitter prism by the tenth fixed phase retarder, is transmitted by the seventh polarization beam splitter prism, then is reflected and coupled into the second photoelectric detector by the fourth reflector, a detection signal obtained by the second photoelectric detector sequentially passes through the amplifier, the filter and the PID controller and then is fed back to a control cabinet of the laser, reflected light split by the sixth polarization beam splitter prism passes through the fifth reflector, the quarter wave plate and the sixth reflector and then enters the seventh polarization beam splitter prism by the eleventh fixed phase retarder, and then reflected by a seventh polarization splitting prism to form second rubidium bubble incident light, wherein the second rubidium bubble incident light enters the rubidium bubble, and the second rubidium bubble incident light and the first rubidium bubble incident light share the same optical axis and are opposite in direction.
The main body frame comprises an optical box body and a clamping plate arranged in the middle of the optical box body, the optical box body comprises a base plate and side walls arranged on the periphery of the base plate, optical interfaces and electrical interfaces are arranged on the side walls, a laser module and a beam combining and splitting module are arranged on the clamping plate, a modulation transfer spectrum frequency stabilizing module is arranged on the base plate, a first coupling head, a second coupling head, a third coupling head, a fourth coupling head and a fifth coupling head are arranged on the side walls, a first photoelectric detector obtains a detection signal, the detection signal is transmitted out through the electrical interface and then is subjected to beat frequency phase locking through a frequency spectrograph, and the detection signal obtained by a second photoelectric detector is fed back to a control cabinet of the laser after passing through the electrical interface, an amplifier, a filter and a PID controller in sequence.
Compared with the prior art, the invention has the following beneficial effects:
1. the main body frame is formed by processing a whole block of material, and structurally comprises a base plate, a side wall and a clamping plate, wherein the base plate and the side wall are connected into a whole; from mechanics angle analysis, this kind of disjunctor structure can greatly improve the intensity of lateral wall, can improve the position of installing the coupling head on the lateral wall and the stability of angle, and the lateral wall also plays the reinforcing effect to the base plate simultaneously, reduces the deformation volume under dead weight and the exogenic action.
2. The laser module and the beam combination and splitting module are arranged on the clamping plate, and the modulation transfer spectrum frequency stabilization module is arranged on the substrate, so that the space is reasonably utilized, the accommodation capacity is doubled compared with that of a traditional platform optical system, the integration level is improved, and the size is reduced.
3. The optical system is integrated in the optical box body, and compared with the traditional platform optical system, the stability of the optical system is improved; and simultaneously, the temperature control, the optical system cleaning and the optical system transportation are easier to be carried out.
In conclusion, the defects that a traditional platform optical system is nonstandard, difficult to maintain, carry, upgrade and occupy large space are overcome; and the defects of difficult upgrading, narrow applicability and the like of an optical system are overcome.
Drawings
FIG. 1 is a schematic cross-sectional view of a main frame;
FIG. 2 is a schematic structural diagram of a laser module and a beam combining and splitting module;
FIG. 3 is a diagram of a first embodiment of a modulation-transfer spectrum frequency stabilization module;
fig. 4 is a schematic diagram of a second embodiment of a modulation transfer spectrum frequency stabilization module.
Detailed description of the preferred embodiments
The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the invention by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments and is not to be construed as limited thereto.
The following combinations are based on85Rb、87The requirement of the Rb atom interferometer for laser frequency illustrates the working principle of the present invention based on an example.
An instant-inserting frequency stabilization module comprises a main body frame 10 and an optical system installed on the main body frame 10.
The main body frame comprises an optical box body and a clamping plate 13 arranged in the middle of the optical box body, and the optical box body comprises a substrate 11 and side walls 12 arranged on the periphery of the substrate 11. The side wall 12 is provided with an optical interface 14 and an electrical interface 15, and the substrate 11 and the main frame are integrally in a concave row structure. The optical interface 14 is used to mount optical fiber couplers (first to fifth coupling heads), and the electrical interface 15 is used to pass signal lines.
As shown in fig. 1, the laser module and the beam combining and splitting module are mounted on a clamping plate 13.
The laser module includes a laser 21, an isolator 22, a phase retarder 23, and a first polarization splitting prism 24.
The beam combining and splitting module includes a first fixed phase retarder 3111, a second polarization beam splitter prism 3121, a second fixed phase retarder 3112, a third polarization beam splitter prism 3122, a fifth fixed phase retarder 3115, a third fixed phase retarder 3113), a fourth polarization beam splitter prism 3123, a sixth fixed phase retarder 3116, a fourth fixed phase retarder 3114, a fifth polarization beam splitter prism 3124, a seventh fixed phase retarder 3117, and a first photodetector 411.
The laser light generated by the laser 21 passes through the isolator 22, the phase retarder 23 and the first polarization beam splitting prism 24 in sequence, is reflected by the first reflector 251, passes through the first fixed phase retarder 3111 to modulate the phase, then passes through the second polarization beam splitting prism 3121 to be divided into two beams, the transmitted light split by the second polarization beam splitting prism 3121 is coupled into the first coupling head 141, is incident into the modulation transfer spectrum frequency stabilization module arranged on the substrate 11 through the hole 16 arranged on the clamping plate 13, the reflected light split by the second polarization beam splitting prism 3121 passes through the second fixed phase retarder 3112 and is divided into two beams through the third polarization beam splitting prism 3122, the reflected light split by the third polarization beam splitting prism 3122 passes through the fifth fixed phase retarder 3115 and is coupled into the second coupling head 142 fixed on the side wall to be emitted, the required seed light is obtained, the transmitted by the transmitted light split by the third polarization beam splitting prism 3122 passes through the third fixed phase retarder 3113 and then transmits through the fourth polarization beam splitting prism 3123 to form a first to-be-combined beam splitter And the laser beam with the same frequency as the laser beam emitted by the laser 21 is emitted from the third coupling head 143 fixed on the side wall, passes through the sixth fixed phase retarder 3116 and is reflected by the fourth polarization beam splitter prism 3123 to form a second beam to be combined, and the first beam to be combined and the second beam to be combined form a combined laser beam. The combined laser beam passes through the fourth fixed phase retarder 3114 and is then divided into two beams by the fifth polarization beam splitter 3124, the reflected light split by the fifth polarization beam splitter 3124 passes through the seventh fixed phase retarder 3117 and is then coupled into the fourth coupling head 144 fixed on the sidewall to be emitted, the transmitted light split by the fifth polarization beam splitter 3124 is reflected by the second reflecting mirror 252 and is then coupled into the first photodetector 411 for detection to obtain a detection signal, the obtained detection signal is transmitted through the electrical interface 15 arranged on the sidewall and then is subjected to beat frequency phase locking by the spectrometer, a feedback signal is generated according to the result and is fed back to the control cabinet of the laser 21, and the frequency of the laser output by the laser 21 is adjusted. .
Fig. 3 is a first embodiment of a modulation transfer spectrum frequency stabilization module, which is mounted on a substrate. The laser beam emitted from the first coupling head 141 enters the fifth coupling head 145, passes through the eighth fixed phase retarder 3118, the third reflecting mirror 253, and the ninth fixed phase retarder 3119 in sequence, and is split into two laser beams by the sixth polarization beam splitter 3125. The transmission light split by the sixth polarization splitting prism 3125 is expanded by the first lens 5141 and the second lens 5142 to form first rubidium bubble incident light which enters the rubidium bubble 511, the first rubidium bubble incident light passes through the rubidium bubble 511, then enters the seventh polarization splitting prism 3126 through the tenth fixed phase retarder 31110, is transmitted by the seventh polarization splitting prism 3126, then is reflected and coupled into the second photodetector 412 through the fourth reflector 254, a detection signal obtained by the second photodetector 412 is transmitted through an electrical interface arranged on the side wall and then passes through an amplifier, a filter and a PID (proportional-integral-differential) controller, and then is fed back to the control cabinet of the laser 21, so as to adjust the frequency of the laser output by the laser 21. The reflected light split by the sixth polarization splitting prism 3125 passes through the fifth reflecting mirror 255, the electro-optic modulator 513, the third lens 5143, the sixth reflecting mirror 256, and the fourth lens 5144, then passes through the eleventh fixed phase retarder 31111, and enters the seventh polarization splitting prism 3126, and is reflected by the seventh polarization splitting prism 3126 to form second rubidium bubble incident light, which enters the rubidium bubble 511, and the second rubidium bubble incident light and the first rubidium bubble incident light share an optical axis and have opposite directions.
Fig. 4 is a second embodiment of a modulation transfer spectrum frequency stabilization module, which is mounted on a substrate. The laser beam emitted from the first coupling head 141 enters the fifth coupling head 145, passes through the eighth fixed phase retarder 3118, the third reflecting mirror 253, and the ninth fixed phase retarder 3119 in sequence, and is split into two laser beams by the sixth polarization beam splitter 3125. The transmitted light split by the sixth polarization splitting prism 3125 forms a first rubidium bubble incident light which enters the rubidium bubble 511, the first rubidium bubble incident light passes through the rubidium bubble 511, then enters the seventh polarization splitting prism 3126 through the tenth fixed phase retarder 31110, then is reflected and coupled into the second photoelectric detector 412 through the fourth reflector 254 after being transmitted by the seventh polarization splitting prism 3126, a detection signal obtained by the second photoelectric detector 412 passes through an electrical interface arranged on the side wall, then passes through an amplifier, and a filter and a PID (proportional-integral-derivative) controller are fed back to a control cabinet of the laser 21, so as to adjust the frequency of the laser output by the laser 21. The reflected light split by the sixth polarization splitting prism 3125 passes through the fifth reflector 255, the quarter wave plate 512, and the sixth reflector 256, then enters the seventh polarization splitting prism 3126 through the eleventh fixed phase retarder 31111, and is reflected by the seventh polarization splitting prism 3126 to form second rubidium bubble incident light, which enters the rubidium bubble 511, and the second rubidium bubble incident light and the first rubidium bubble incident light share an optical axis and have opposite directions.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (4)
1. An insert formula frequency stabilization device promptly, includes main body frame (10), its characterized in that: the main body frame (10) is provided with a laser module and a beam combining and splitting module,
the laser module comprises a laser (21), an isolator (22), a phase retarder (23) and a first polarization beam splitter prism (24),
the beam combining and splitting module comprises a first fixed phase retarder (3111), a second polarization beam splitter prism (3121), a second fixed phase retarder (3112), a third polarization beam splitter prism (3122), a fifth fixed phase retarder (3115), a third fixed phase retarder (3113), a fourth polarization beam splitter prism (3123), a sixth fixed phase retarder (3116), a fourth fixed phase retarder (3114), a fifth polarization beam splitter prism (3124), a seventh fixed phase retarder (3117) and a first photoelectric detector (411),
laser light is generated by a laser (21), sequentially passes through an isolator (22), a phase retarder (23) and a first polarization beam splitting prism (24), is reflected by a first reflecting mirror (251), is modulated in phase by a first fixed phase retarder (3111), is divided into two beams by a second polarization beam splitting prism (3121), transmitted light split by the second polarization beam splitting prism (3121) is coupled into a first coupling head (141) and then is incident into a modulation transfer spectrum frequency stabilizing module, reflected light split by the second polarization beam splitting prism (3121) is coupled into two beams by a third polarization beam splitting prism (3122) after passing through a second fixed phase retarder (3112), reflected light split by the third polarization beam splitting prism (3122) is coupled into the second coupling head (142) after passing through a fifth fixed phase retarder (3115) and then is emitted, and transmitted by the fourth polarization beam splitting prism (3123) after passing through the third fixed phase retarder (3113) to form a first to-be-combined beam splitter Laser with the same frequency as the laser emitted by the laser (21) is emitted from the third coupling head (143), passes through a sixth fixed phase retarder (3116) and then is reflected by a fourth polarization beam splitter prism (3123) to form second to-be-combined laser, the first to-be-combined laser and the second to-be-combined beam form combined laser, the combined laser passes through the fourth fixed phase retarder (3114) and then is split into two beams by a fifth polarization beam splitter prism (3124), the reflected light split by the fifth polarization beam splitter prism (3124) passes through a seventh fixed phase retarder (3117) and then is coupled into the fourth coupling head (144) to be emitted, the transmitted light split by the fifth polarization beam splitter prism (3124) is reflected by a second reflecting mirror (252) and then is coupled into the first photoelectric detector (411) to be detected to obtain a detection signal, the obtained detection signal enters the spectrometer to be subjected to beat frequency phase locking and generates a frequency locking feedback signal, the frequency-locked feedback signal is fed back to the control cabinet of the laser (21).
2. An add-drop frequency stabilizer according to claim 1, wherein said modulation transfer spectrum frequency stabilizer module comprises an eighth fixed phase delayer (3118),
laser emitted by the first coupling head (141) enters the fifth coupling head (145), then sequentially passes through an eighth fixed phase retarder (3118), a third reflector (253) and a ninth fixed phase retarder (3119), then is divided into two beams by a sixth polarization beam splitter prism (3125), transmitted light split by the sixth polarization beam splitter prism (3125) is expanded by a first lens (5141) and a second lens (5142) to form first rubidium bubble incident light which enters a rubidium bubble (511), the first rubidium bubble incident light passes through the rubidium bubble (511), then enters a seventh polarization beam splitter prism (3126) by a tenth fixed phase retarder (31110), is transmitted by the seventh polarization beam splitter prism (3126), then is reflected and coupled into the second photoelectric detector (412) by the fourth reflector (254), and then passes through a detection signal amplifier, a filter and a PID controller obtained by the second photoelectric detector (412) and then is fed back to a control cabinet of the laser (21), the reflected light split by the sixth polarization splitting prism (3125) is incident to a seventh polarization splitting prism (3126) through an eleventh fixed phase retarder (31111) after passing through a fifth reflector (255), an electro-optic modulator (513), a third lens (5143), a sixth reflector (256) and a fourth lens (5144), and is reflected by the seventh polarization splitting prism (3126) to form second rubidium bubble incident light, the second rubidium bubble incident light enters the rubidium bubble (511), and the second rubidium bubble incident light and the first rubidium bubble incident light share an optical axis and are opposite in direction.
3. An add-drop frequency stabilizer according to claim 1, wherein said modulation transfer spectrum frequency stabilizer module comprises an eighth fixed phase delayer (3118),
laser emitted by the first coupling head (141) enters the fifth coupling head (145) and then sequentially passes through the eighth fixed phase retarder (3118), the third reflector (253) and the ninth fixed phase retarder (3119), then is divided into two beams by the sixth polarization beam splitter prism (3125), transmitted light split by the sixth polarization beam splitter prism (3125) forms first rubidium bubble incident light which enters the rubidium bubble (511), the first rubidium bubble incident light passes through the rubidium bubble (511) and then enters the seventh polarization beam splitter prism (3126) by the tenth fixed phase retarder (31110), the first rubidium bubble incident light is transmitted by the seventh polarization beam splitter prism (3126) and then is reflected and coupled into the second photoelectric detector (412) by the fourth reflector (254), a detection signal obtained by the second photoelectric detector (412) sequentially passes through the amplifier, the filter and the PID controller and then is fed back to a control cabinet of the laser (21), and reflected light split by the sixth polarization beam splitter prism (3125) passes through the fifth reflector (255), The incident light of the second rubidium bubble enters the rubidium bubble (511), and the incident light of the second rubidium bubble and the incident light of the first rubidium bubble share an optical axis and have opposite directions.
4. The plug-in frequency stabilizer according to claim 2 or 3, wherein the main frame comprises an optical box and a clamp plate (13) disposed in the middle of the optical box, the optical box comprises a substrate (11) and a sidewall (12) disposed around the substrate (11), the sidewall (12) is provided with an optical interface and an electrical interface, the laser module and the beam combining and splitting module are disposed on the clamp plate (13), the modulation-transfer spectrum frequency stabilizer is disposed on the substrate (11), the first coupling head (141), the second coupling head (142), the third coupling head (143), the fourth coupling head (144) and the fifth coupling head (145) are disposed on the sidewall (12), the first photoelectric detector (411) obtains a detection signal transmitted from the electrical interface and then performs a beat frequency lock by the spectrometer, the detection signal obtained from the second photoelectric detector (412) passes through the amplifier and the electrical interface in sequence, The filter and the PID controller are fed back to the control cabinet of the laser (21).
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