A high signal-to-noise ratio atomic filtration system for laser beacons

Abstract

This application provides a high signal-to-noise ratio atomic filtration system for laser beacons, belonging to the field of laser beacons. It includes a laser generator, a laser controller, a receiving device, a first alkali metal atomic filter, a first photoelectric converter, and a control device. The laser generator is used to form the laser beacon; the laser controller controls the frequency of the laser emitted by the laser generator; the receiving device receives the echo signal light from the laser beacon; the first alkali metal atomic filter filters out background noise light from the echo signal light; the laser controller, the first alkali metal atomic filter, and the first photoelectric converter are all connected to the control device; the control device analyzes the echo signal intensity spectrum and adjusts the laser frequency of the laser generator and the parameter data of the alkali metal atomic filter based on the analysis results, thereby achieving the technical effect of the photoelectric converter effectively extracting high signal-to-noise ratio effective signal light.

Description

Technical Field

[0001] This application relates to the field of laser beacon technology, and more specifically to a high signal-to-noise ratio atomic filtration system for laser beacons. Background Technology

[0002] As the fundamental transmission channel for light waves in many practical applications such as astronomical target observation and long-range laser energy transport, the atmosphere suffers severe wavefront distortion due to random fluctuations in atmospheric refractive index caused by human activities, solar radiation, and other factors. This distortion has become a significant factor limiting the performance of practical systems.

[0003] Adaptive optics used to correct dynamic wavefront distortions of light waves caused by random atmospheric disturbances in real time typically requires a sufficiently bright reference source, i.e., a beacon, to provide information on the optical wavefront distortions induced by atmospheric disturbances.

[0004] In order to avoid the influence of the skylight background on the Hartmann wavefront sensor's detection of beacon backlight, traditional adaptive optics systems can only operate at night, which greatly limits their working hours. Summary of the Invention

[0005] In view of the technical problems existing in the background art, this application provides a high signal-to-noise ratio atomic filtering system based on a laser beacon. The alkali metal atomic filter has advantages such as high transmittance, narrow bandwidth, and high sideband suppression ratio, thereby achieving the technical effect of filtering out background noise light from the echo signal light received by the receiving device. Secondly, in this application, the control device analyzes the echo signal light received by the receiving device and adjusts the laser frequency of the laser generator and the parameter data of the alkali metal atomic filter based on the analysis results, thereby achieving the technical effect of the photoelectric converter effectively extracting the effective signal light with a high signal-to-noise ratio.

[0006] This application provides a high signal-to-noise ratio atomic filtration system based on a laser beacon, comprising:

[0007] A laser generator is used to emit laser light into a region of the sky and excite atoms in that region of the sky to undergo resonant transitions to form a laser beacon.

[0008] A laser controller, connected to the laser generator, is used to control the wavelength and frequency of the laser emitted by the laser generator;

[0009] A receiving device is used to receive the echo signal light from the laser beacon;

[0010] A first alkali metal atom filter is used to filter out background noise light in the echo signal light received by the receiving device;

[0011] A first photoelectric converter is used to convert the echo signal light into an echo signal intensity spectrum.

[0012] The control device is connected to the laser controller, the first alkali metal atomic filter, and the first photoelectric converter. The control device is used to analyze the echo signal intensity spectrum and control the first alkali metal atomic filter and the laser controller based on the analysis results of the echo signal intensity spectrum.

[0013] In the technical solution of this application embodiment, the control device sorts the echo signal intensity icons and optimizes the parameters of the first alkali metal atomic filter and the laser frequency of the laser emitted by the laser generator based on the analysis results of the echo signal intensity spectrum, thereby achieving a high signal-to-noise ratio atomic filtering effect.

[0014] In some embodiments, a frequency stabilization device is further included, which is connected to the laser controller and is used to detect the laser frequency emitted by the laser generator.

[0015] In this embodiment, the laser frequency change of the laser emitted by the laser generator is detected by the frequency stabilization device, and the detected laser frequency change is sent to the laser controller so that the laser controller can adjust the laser generator according to the laser frequency change detected by the frequency stabilization device.

[0016] In some embodiments, the frequency stabilization device includes a second photoelectric converter, a second alkali metal atomic filter, and a beam splitter. The beam splitter is disposed at the emitting end of the laser generator and is used to split the laser emitted by the laser generator into a first laser and a second laser. The first laser is used to form a laser beacon. The second laser passes sequentially through the second alkali metal atomic filter and the second photoelectric converter. The second photoelectric converter is communicatively connected to the laser controller. The parameters of the second alkali metal atomic filter are consistent with the parameters of the first alkali metal atomic filter.

[0017] In some embodiments, a wavelength meter is also included. The laser emitted by the laser generator is further converted into a third laser by the beam splitter. The wavelength meter is connected to the control device and is used to detect the wavelength data of the third laser and transmit the wavelength data to the control device.

[0018] In this embodiment, the wavelength meter can detect the actual wavelength of the laser emitted by the laser generator. Secondly, during use, after the wavelength meter transmits the wavelength data to the control device, the control device can monitor the changes in the wavelength of the laser emitted by the laser generator through the wavelength meter. When the wavelength changes significantly, the control device can make the system operation more stable by readjusting the parameters of the laser controller and the first alkali metal atom filter.

[0019] In some embodiments, a narrowband interference filter is further included, which is placed between the receiving device and the first alkali metal atom filter, and the echo signal light passes sequentially through the receiving device, the narrowband interference filter and the first alkali metal atom filter.

[0020] In this embodiment, the narrowband interference filter can coarsely filter the echo signal light so that the echo signal light can achieve a narrower bandwidth filtering when it enters the alkali metal filter.

[0021] In some embodiments, the first alkali metal atomic filter has the same structure as the second alkali metal atomic filter.

[0022] In this embodiment, when the control device adjusts the second alkali metal atomic filter by the parameters of the first alkali metal atomic filter, the filtering effect of the first alkali metal atomic filter can be kept consistent with the filtering effect of the second alkali metal atomic filter.

[0023] In some embodiments, the first alkali metal atom filter includes:

[0024] An alkali metal atom gas chamber, wherein the alkali metal atom gas chamber is filled with alkali metal atoms;

[0025] A magnetic field control device for generating an axial magnetic field within the alkali metal atom gas chamber;

[0026] Temperature control device for controlling the temperature inside the alkali metal atom gas chamber;

[0027] A first polarizer and a second polarizer are respectively disposed on both sides of the alkali metal atom gas cell. Both the first polarizer and the second polarizer are linear polarizers, and their polarization directions are perpendicular to each other.

[0028] In some embodiments, the alkali metal atom chamber is further filled with a buffer gas.

[0029] In this embodiment, filling the alkali metal atom gas chamber with a buffer gas enables the transmission spectrum to be broadened and shaped.

[0030] In some embodiments, the first alkali metal atom filter further includes a temperature sensor for detecting the actual temperature inside the alkali metal atom chamber.

[0031] In this embodiment, the actual temperature inside the alkali metal atom gas chamber can be detected in real time by a temperature sensor, which facilitates the temperature control device to adjust the temperature inside the alkali metal atom gas chamber.

[0032] In some embodiments, a wavefront sensor detection system is further included, which is connected to the first photoelectric converter.

[0033] In this embodiment, the wavefront sensor detection system can effectively measure the atmospheric turbulence characteristics in real time.

[0034] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0036] Figure 1 This is a schematic diagram of the structural framework of the high signal-to-noise ratio atomic filtration system based on laser beacons in the embodiments of this application;

[0037] Figure 2 This is a schematic diagram of the structural framework of the first alkali metal atom filter in the embodiments of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Laser generator; 2. Laser controller; 3. Receiving device;

[0040] 4. First alkali metal atomic filter; 5. First photoelectric converter; 6. Control device;

[0041] 7. Second photoelectric converter; 8. Second alkali metal atomic filter; 9. Spectrometer; 10. Wavelength meter;

[0042] 11. Alkali metal atom gas chamber; 12. Magnetic field control device; 13. Temperature control device;

[0043] 14. First polarizer; 15. Second polarizer; 16. Wavefront sensor detection system. Detailed Implementation

[0044] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0045] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0046] In this document, the term "comprising" indicates the presence of a described feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," with exclusions being otherwise specifically emphasized. Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying one or more of the feature. In the description of embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0047] In this text, the term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this text generally indicates that the preceding and following related objects have an "or" relationship.

[0048] As the fundamental transmission channel for light waves in many practical applications such as astronomical target observation and long-range laser energy transport, the atmosphere suffers severe wavefront distortion due to random fluctuations in atmospheric refractive index caused by human activities, solar radiation, and other factors. This distortion has become a significant factor limiting the performance of practical systems.

[0049] Adaptive optics used to correct dynamic wavefront distortions of light waves caused by random atmospheric disturbances in real time typically requires a sufficiently bright reference source, i.e., a beacon, to provide information on the optical wavefront distortions induced by atmospheric disturbances.

[0050] In order to avoid the influence of the skylight background on the Hartmann wavefront sensor's detection of beacon backlight, traditional adaptive optics systems can only operate at night, which greatly limits their working hours.

[0051] To address the limitation of traditional adaptive optics systems, which can only operate at night to avoid the influence of ambient light on the Hartmann wavefront sensor's detection of beacon backlight, thus severely restricting their working hours, this application provides a high signal-to-noise ratio (SNR) atomic filtering system based on a laser beacon. The alkali metal atomic filter offers advantages such as high transmittance, narrow bandwidth, and high sideband suppression ratio, effectively filtering out background noise from the echo signal light received by the receiving device 3. Furthermore, in this application, the control device 6 analyzes the echo signal light received by the receiving device 3 and adjusts the laser frequency of the laser generator 1 and the parameters of the alkali metal atomic filter based on the analysis results. This allows the photoelectric converter to effectively extract the high SNR effective signal light.

[0052] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a high signal-to-noise ratio atomic filtration system based on a laser beacon provided in an embodiment of this application. The high signal-to-noise ratio atomic filtration system based on a laser beacon includes:

[0053] Laser generator 1 is used to emit laser light into the sky region and excite atoms in the sky region to undergo resonant transitions to form a laser beacon;

[0054] Laser controller 2 is connected to laser generator 1 and is used to control the wavelength and frequency of the laser emitted by laser generator 1.

[0055] Receiver 3 is used to receive the echo signal light from the laser beacon;

[0056] The first alkali metal atomic filter 4 is used to filter out background noise light in the echo signal light received by the receiving device 3;

[0057] The first photoelectric converter 5 is used to convert the echo signal light into an echo signal intensity spectrum.

[0058] The control device 6, laser controller 2, first alkali metal atomic filter 4 and first photoelectric converter 5 are all connected to the control device 6; the control device 6 is used to analyze the echo signal intensity spectrum and control the first alkali metal atomic filter 4 and laser controller 2 according to the analysis results of the echo signal intensity spectrum.

[0059] Specifically, during use, the laser controller 2 controls the excitation generator to emit lasers of different frequencies in a frequency sweeping manner. During this process, the laser emitted by the laser generator 1 is focused in the intermediate sodium layer of the atmosphere (center height about 90 km, distribution thickness about 15-20 km) under the action of the emission optical system. The strong square at the focal point causes the D2 line laser of sodium atoms in the intermediate sodium layer of the atmosphere to backscatter resonantly and generate fluorescence, thus forming a laser beacon.

[0060] The receiving device 3 receives the echo signal light of the laser beacon generated by lasers of different frequencies in real time. After the echo signal light is received by the receiving device 3, it will first pass through the first alkali metal atom filter 4 for filtering to eliminate the background noise in the echo signal light, thereby extracting the effective signal light for collection by the first photoelectric converter 5.

[0061] The first photoelectric converter 5 transmits the collected data to the control device 6. The control device 6 analyzes and processes the data collected by the first photoelectric converter 5 to obtain the echo signal intensity spectrum at different laser frequencies.

[0062] After the control device 6 has sorted out the echo signal intensity spectrum, it compares and analyzes the echo signal intensity spectrum to obtain the first laser frequency corresponding to the strongest peak in the echo signal intensity spectrum of lasers of different frequencies.

[0063] After obtaining the first laser frequency corresponding to the strongest peak in the echo signal intensity spectrum, the parameters of the laser controller 2 are adjusted so that the laser generator 1 emits laser light at the first laser frequency, thereby enabling the receiving device 3 to receive a clear echo signal light.

[0064] In this embodiment, after the control device 6 adjusts the laser frequency emitted by the laser generator 1 according to the peak value of the echo signal intensity spectrum, in order to further increase the intensity of the echo signal, the parameters of the first alkali metal atomic filter 4 also need to be adjusted. During this process, the laser generator 1 continuously emits laser at the first laser frequency, and the parameters of the first alkali metal atomic filter 4 are adjusted gradually. At this time, the control device 6 obtains the echo signal data during the parameter change of the first alkali metal atomic filter 4 through the first photoelectric converter 5, and obtains the change curve of the echo signal light intensity based on these echo signal data. The control device 6 obtains the parameter data corresponding to the maximum echo signal light intensity based on the change curve, and adjusts the parameters of the first alkali metal atomic filter 4 according to the corresponding parameter data when the echo signal light intensity is at its maximum, thereby obtaining a high signal-to-noise ratio atomic filtering effect.

[0065] Furthermore, in this embodiment, since the laser frequency emitted by the laser generator 1 may change due to changes in working environment conditions (such as temperature and current) during actual use, thereby affecting the intensity of the echo signal received by the receiving device 3, in order to eliminate the phenomenon of laser frequency drift caused by changes in the working environment of the laser generator 1, the high signal-to-noise ratio atomic filtering system based on the laser beacon also includes a frequency stabilization device. The frequency stabilization device is connected to the laser controller 2. During use, the frequency stabilization device detects the change in the laser frequency emitted by the laser generator 1 and sends the detected change in the laser frequency emitted by the laser generator 1 to the laser controller 2, so that the laser controller 2 can adjust the laser generator 1 according to the change in the laser frequency emitted by the laser generator 1 detected by the frequency stabilization device.

[0066] Further, in this embodiment, the frequency stabilization device includes a second photoelectric converter 7, a second alkali metal atomic filter 8, and a beam splitter 9. The beam splitter 9 is located at the emitting end of the laser generator 1 and is used to split the laser emitted by the laser generator 1 into a first laser and a second laser. The first laser is used to form a laser beacon, and the second laser passes sequentially through the second alkali metal atomic filter 8 and the second photoelectric converter 7. The second photoelectric converter 7 is communicatively connected to the laser controller 2. The parameters of the second alkali metal atomic filter 8 are consistent with the parameters of the first alkali metal atomic filter 4. During use, the beam splitter 9 located at the emitting end of the laser generator 1 splits the laser into a first laser and a second laser. The first laser is used to form a laser beacon, and the second laser passes through the second alkali metal atomic filter 8 and is collected by the second photoelectric converter 7. The laser control device 6 adjusts the laser frequency emitted by the laser generator 1 in real time based on the data collected by the second photoelectric converter 7, thereby achieving the effect of frequency stabilization.

[0067] Furthermore, in the embodiments of this application, the first alkali metal atomic filter 4 and the second alkali metal atomic filter 8 have the same structure, so that when the control device 6 adjusts the second alkali metal atomic filter 8 through the parameters of the first alkali metal atomic filter 4, the filtering effect of the first alkali metal atomic filter 4 can be consistent with the filtering effect of the second alkali metal atomic filter 8.

[0068] Furthermore, in this embodiment, the laser emitted by the laser generator 1 generates a third laser through the beam splitter 9. The wavelength meter 10 is connected to the control device 6. By detecting the wavelength data of the third laser, the wavelength meter can detect the actual wavelength of the laser emitted by the laser generator 1. Secondly, during use, after the wavelength meter 10 transmits the wavelength data to the control device 6, the control device 6 can monitor the changes in the wavelength of the laser emitted by the laser generator 1 through the wavelength meter 10. When the wavelength changes significantly, the control device 6 can make the system operation more stable by readjusting the parameters of the laser controller 2 and the first alkali metal atom filter 4.

[0069] Furthermore, in this embodiment of the application, in order to achieve a better filtering effect on the echo signal, the high signal-to-noise ratio atomic filtering system based on the laser beacon also includes a narrowband interference filter. The narrowband interference filter is placed between the receiving device 3 and the first alkali metal atomic filter 4. After receiving the echo signal light, the echo signal light passes through the receiving device 3, the narrowband interference filter and the first alkali metal atomic filter 4 in sequence. During this process, the narrowband interference filter can perform coarse filtering on the echo signal light so that the echo signal light can achieve a narrower bandwidth filtering when it enters the alkali metal filter.

[0070] Further, please refer to Figure 2 In this embodiment, the first alkali metal atom filter 4 includes: an alkali metal atom gas chamber 11, a magnetic field control device 12, a temperature control device 13, a first polarizer 14, and a second polarizer 15. The alkali metal atom gas chamber 11 is filled with alkali metal atoms. The magnetic field control device 12 is used to form an axial magnetic field within the alkali metal atom gas chamber 11. The temperature control device 13 is used to control the temperature within the alkali metal atom gas chamber 11. The first polarizer 14 and the second polarizer 15 are respectively disposed on opposite sides of the alkali metal atom gas chamber 11. Both the first polarizer 14 and the second polarizer 15 are linear polarizers, and their polarization directions are perpendicular to each other. During use, the magnetic field control device 12 and the temperature control device 13 create specific magnetic field and temperature conditions within the alkali metal atom gas chamber 11. Under these specific magnetic field and temperature conditions, anomalous dispersion causes a narrow transmission band in the transmission spectrum near the resonance frequency, thereby achieving a high spectral resolution filtering effect. Secondly, the first polarizer 14 and the second polarizer 15, which are set on both sides of the alkali metal atom gas cell 11 and whose polarization directions are perpendicular to each other, can filter the laser whose polarization direction rotates under the action of a magnetic field.

[0071] Furthermore, in this embodiment, the alkali metal atom gas chamber 11 is also filled with a buffer gas, which can broaden and shape the transmission spectrum.

[0072] In this embodiment, the buffer gas is generally an inert gas (helium, nitrogen, argon, etc.), and the buffer gas pressure is preferably 10 to 50 Torr.

[0073] Furthermore, in this embodiment, the first alkali metal atom filter 4 also includes a temperature sensor, which can detect the actual temperature inside the alkali metal atom gas chamber 11 in real time, thereby facilitating the temperature control device 13 to adjust the temperature inside the alkali metal atom gas chamber 11.

[0074] Furthermore, in this embodiment of the application, the high signal-to-noise ratio atomic filtering system based on laser beacons also includes a wavefront sensor detection system 16. The wavefront sensor detection system 16 is connected to the first photoelectric converter 5. During use, the receiving telescope collects the echo signal light within the field of view, and the first alkali metal atomic filter 4 filters out the solar background noise light in the echo signal light, extracting the effective signal light from the echo signal light. The effective signal light enters the wavefront sensor detection system 16 for real-time measurement of atmospheric turbulence characteristics.

[0075] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application of the technical solution and the constraints involved. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0076] When the embodiments of this application are implemented using software, they can be implemented entirely or partially in the form of a computer program product. That is, the implementation of all or part of the processes in the methods of the above embodiments can also be accomplished by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0077] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A high signal-to-noise ratio atomic filtration system based on laser beacons, characterized in that, include: A laser generator is used to emit laser light into a region of the sky and excite atoms in that region of the sky to undergo resonant transitions to form a laser beacon. A laser controller, connected to the laser generator, is used to control the wavelength and frequency of the laser emitted by the laser generator; A receiving device is used to receive the echo signal light from the laser beacon; A first alkali metal atom filter is used to filter out background noise light in the echo signal light received by the receiving device; A first photoelectric converter is used to convert the echo signal light into an echo signal intensity spectrum. The control device is connected to the laser controller, the first alkali metal atomic filter, and the first photoelectric converter. The control device is used to analyze the echo signal intensity spectrum and control the first alkali metal atomic filter and the laser controller based on the analysis results of the echo signal intensity spectrum.

2. The high signal-to-noise ratio atomic filtration system based on laser beacons according to claim 1, characterized in that, It also includes a frequency stabilization device, which is connected to the laser controller and is used to detect the laser frequency emitted by the laser generator.

3. The high signal-to-noise ratio atomic filtration system based on laser beacons according to claim 2, characterized in that, The frequency stabilization device includes a second photoelectric converter, a second alkali metal atomic filter, and a beam splitter. The beam splitter is disposed at the emitting end of the laser generator and is used to split the laser emitted by the laser generator into a first laser and a second laser. The first laser is used to form a laser beacon. The second laser passes through the second alkali metal atomic filter and the second photoelectric converter in sequence. The second photoelectric converter is communicatively connected to the laser controller. The parameters of the second alkali metal atomic filter are consistent with the parameters of the first alkali metal atomic filter.

4. The high signal-to-noise ratio atomic filtration system based on laser beacons according to claim 3, characterized in that, It also includes a wavelength meter, and the laser emitted by the laser generator is used to generate a third laser through the beam splitter. The wavelength meter is connected to the control device to detect the wavelength data of the third laser and transmit the wavelength data to the control device.

5. The high signal-to-noise ratio atomic filtration system based on laser beacons according to claim 1, characterized in that, It also includes a narrowband interference filter, which is placed between the receiving device and the first alkali metal atom filter, and the echo signal light passes through the receiving device, the narrowband interference filter and the first alkali metal atom filter in sequence.

6. The high signal-to-noise ratio atomic filtration system based on laser beacons according to claim 3, characterized in that, The first alkali metal atomic filter has the same structure as the second alkali metal atomic filter.

7. The high signal-to-noise ratio atomic filtration system based on laser beacons according to claim 6, characterized in that, The first alkali metal atom filter includes: An alkali metal atom gas chamber, wherein the alkali metal atom gas chamber is filled with alkali metal atoms; A magnetic field control device for generating an axial magnetic field within the alkali metal atom gas chamber; Temperature control device for controlling the temperature inside the alkali metal atom gas chamber; A first polarizer and a second polarizer are respectively disposed on both sides of the alkali metal atom gas cell. Both the first polarizer and the second polarizer are linear polarizers, and their polarization directions are perpendicular to each other.

8. The high signal-to-noise ratio atomic filtration system based on laser beacons according to claim 7, characterized in that, The alkali metal atom chamber is also filled with a buffer gas.

9. The high signal-to-noise ratio atomic filtration system based on laser beacons according to claim 7, characterized in that, The first alkali metal atom filter also includes a temperature sensor, which is used to detect the actual temperature inside the alkali metal atom chamber.

10. The high signal-to-noise ratio atomic filtration system based on laser beacons according to claim 1, characterized in that, It also includes a wavefront sensor detection system, which is connected to the first photoelectric converter.

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