High signal-to-noise ratio atom filtering system for laser beacon

Abstract

The invention provides a high signal-to-noise ratio atomic filtering system for a laser beacon, and belongs to the field of laser beacons, the high signal-to-noise ratio atomic filtering system comprises 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 for forming the laser beacon; the laser controller is used for controlling the laser emitting frequency of the laser generator; the receiving device is used for receiving echo signal light of the laser beacon; the first alkali metal atom light filter is used for filtering background noise light in the echo signal light; the laser controller, the first alkali metal atom light filter and the first photoelectric converter are all connected with the control device; the control device analyzes the echo signal intensity spectrum and adjusts the laser frequency of the generator laser of the laser generator and the parameter data of the alkali metal atom light filter according to the analysis result of the echo signal intensity spectrum, so that the technical effect that the photoelectric converter effectively extracts effective signal light with a high signal-to-noise ratio is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of laser beacons, and in particular to a high signal-to-noise ratio atomic filtering system for laser beacons. Background Art

[0002] The atmosphere is the basic transmission channel for light waves in many practical system applications, such as astronomical target observation and laser long-distance energy transmission. Due to the random fluctuations of the atmospheric refractive index caused by factors such as human activities and solar radiation, the transmitted light waves suffer from severe wavefront distortion, which has become an important factor limiting the performance of practical system applications.

[0003] Adaptive optics, which is used to correct the dynamic wavefront distortion of optical waves caused by random atmospheric disturbances in real time, usually requires a sufficiently bright reference source to provide information on the optical wavefront distortion caused by the disturbed atmosphere, namely, a beacon.

[0004] In order to avoid the influence of sky light background on the detection of beacon return light by Hartmann wavefront sensor, the traditional adaptive optical system can only work at night, which greatly limits its working time. Summary of the invention

[0005] In view of the technical problems existing in the background technology, the present application provides a high signal-to-noise ratio atomic filtering system based on a laser beacon, which has the advantages of high transmittance, narrow bandwidth, high sideband suppression ratio, etc. through the alkali metal atom filter, so as to achieve the technical effect of filtering out the background noise light in the echo signal light received by the receiving device. Secondly, in the present 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 atom filter according to the analysis result of the control device, thereby achieving the technical effect of the photoelectric converter effectively extracting the effective signal light with a high signal-to-noise ratio.

[0006] The embodiment of the present application provides a high signal-to-noise ratio atomic filtering system based on a laser beacon, comprising:

[0007] A laser generator, used to emit laser light to a sky region and excite atoms in the sky region to undergo resonance transition to form a laser beacon;

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

[0009] A receiving device, used for receiving the echo signal light of the laser beacon;

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

[0011] A first photoelectric converter, used for converting the echo signal light into an echo signal intensity spectrum;

[0012] A control device, the laser controller, the first alkali metal atom filter and the first photoelectric converter are all connected to the control device; the control device is used to analyze the echo signal intensity spectrum and control the first alkali metal atom filter and the laser controller according to the analysis results of the echo signal intensity spectrum.

[0013] In the technical solution of the embodiment of the present application, the control device selects the echo signal intensity icon and optimizes the parameters of the first alkali metal atom filter and the laser frequency of the laser generator emitting the laser according to 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 stabilizing device is also included, and the frequency stabilizing device is connected to the laser controller and is used to detect the laser frequency of the laser emitted by the laser generator.

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

[0016] In some embodiments, the frequency stabilization device includes a second photoelectric converter, a second alkali metal atom filter and a spectrometer. The spectrometer is arranged at the emission end of the laser generator, and is used to separate 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, and the second laser passes through the second alkali metal atom filter and the second photoelectric converter in sequence. The second photoelectric converter is communicatively connected to the laser controller, wherein the parameters of the second alkali metal atom filter are consistent with the parameters of the first alkali metal atom filter.

[0017] In some embodiments, a wavelength meter is further included. The laser emitted by the laser generator also generates a third laser through the spectrometer. The wavelength meter is connected to the control device to detect wavelength data of the third laser and transmit the wavelength data to the control device.

[0018] In this embodiment, the wavelength of the laser actually emitted by the laser generator can be detected by the wavelength meter. Secondly, during use, after the wavelength meter transmits the wavelength data to the control device, the control device can monitor the change of the wavelength of the laser emitted by the laser generator through the wavelength meter. When the wavelength changes greatly, the control device can make the system operation more stable by re-adjusting the parameters of the laser controller and the first alkali metal atom filter.

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

[0020] In this embodiment, the narrow-band interference filter can perform coarse filtering on the echo signal light, so that the echo signal light can be filtered with a narrower bandwidth when entering the alkali metal filter.

[0021] In some embodiments, the first alkali metal atom filter and the second alkali metal atom filter have the same structure.

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

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

[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, used for forming an axial magnetic field in the alkali metal atom gas chamber;

[0026] A temperature control device, used to control the temperature in the alkali metal atom gas chamber;

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

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

[0029] In this embodiment, the transmission spectrum can be broadened and shaped by filling the alkali metal atom gas cell with a buffer gas.

[0030] In some embodiments, the first alkali metal atom filter further includes a temperature sensor, and the temperature sensor is used to detect the actual temperature in the alkali metal atom gas chamber.

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

[0032] In some embodiments, a wavefront sensor detection system is also included, and the wavefront sensor detection system 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 the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 This is a schematic diagram of the structural framework of a high signal-to-noise ratio atomic filtering system based on a laser beacon in an embodiment of the present application;

[0037] Figure 2 Schematic diagram of the structural framework of the first alkali metal atom filter in the embodiment of the present application.

[0038] Description of reference numerals:

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

[0040] 4. a first alkali metal atom filter; 5. a first photoelectric converter; 6. a control device;

[0041] 7. A second photoelectric converter; 8. A second alkali metal atom filter; 9. A spectrometer; 10. A 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 DESCRIPTION

[0044] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0045] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0046] The term "comprising" herein indicates the presence of the described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. The terms "comprising", "including", "having" and their variations all mean "including but not limited to", excluding that they are specially emphasized in other ways. Hereinafter, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating one or more of the features. In the description of the embodiments of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0047] In this article, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] The atmosphere is the basic transmission channel for light waves in many practical system applications, such as astronomical target observation and laser long-distance energy transmission. Due to the random fluctuations of the atmospheric refractive index caused by factors such as human activities and solar radiation, the transmitted light waves suffer from severe wavefront distortion, which has become an important factor limiting the performance of practical system applications.

[0049] Adaptive optics, which is used to correct the dynamic wavefront distortion of optical waves caused by random atmospheric disturbances in real time, usually requires a sufficiently bright reference source to provide information on the optical wavefront distortion caused by the disturbed atmosphere, namely, a beacon.

[0050] In order to avoid the influence of sky light background on the detection of beacon return light by Hartmann wavefront sensor, the traditional adaptive optical system can only work at night, which greatly limits its working time.

[0051] In order to solve the technical problem that the traditional adaptive optical system can only work at night to avoid the influence of sky light background on the beacon echo detection by the Hartmann wavefront sensor, which greatly limits its working period, the present application provides a high signal-to-noise ratio atomic filtering system based on a laser beacon, which can achieve the technical effect of filtering out the background noise light in the echo signal light received by the receiving device 3 through the advantages of alkali metal atom filter, such as high transmittance, narrow bandwidth, and high sideband suppression ratio. Secondly, in the present application, the control device 6 analyzes the echo signal light received by the receiving device 3, and adjusts the laser frequency of the laser generated by the laser generator 1 and the parameter data of the alkali metal atom filter according to the analysis result of the control device 6, thereby achieving the technical effect of the photoelectric converter effectively extracting the effective signal light with a high signal-to-noise ratio.

[0052] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a high signal-to-noise ratio atomic filtering system based on a laser beacon provided in an embodiment of the present application, wherein the high signal-to-noise ratio atomic filtering system based on a laser beacon comprises:

[0053] A laser generator 1 is used to emit laser light to the sky area and stimulate atoms in the sky area to undergo resonance transition to form a laser beacon;

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

[0055] A receiving device 3, used for receiving the echo signal light of the laser beacon;

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

[0057] A first photoelectric converter 5, used for converting the echo signal light into an echo signal intensity spectrum;

[0058] The control device 6, the laser controller 2, the first alkali metal atom filter 4 and the 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 atom filter 4 and the 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 sweeping manner. During this process, the laser emitted by the laser generator 1 is focused in the middle sodium layer of the atmosphere (central altitude of about 90 kilometers, distribution thickness of about 15 to 20 kilometers) under the action of the transmitting optical system. The strong square at the focus will cause the D2 line laser of the sodium atoms in the middle sodium layer of the atmosphere to resonate backward and scatter, and generate fluorescence, thereby forming a laser beacon.

[0060] The receiving device 3 is controlled to receive 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 be filtered by the first alkali metal atom filter 4 to eliminate the background noise in the echo signal light, so as to extract the effective signal light to be collected by the first photoelectric converter 5.

[0061] The first photoelectric converter 5 transmits the collected data to the control device 6, and the control device 6 analyzes and organizes the data collected by the first photoelectric converter 5, thereby obtaining echo signal intensity spectra under different laser frequencies;

[0062] After arranging the echo signal intensity spectra, the control device 6 compares and analyzes the echo signal intensity spectra to obtain the first laser frequency corresponding to the strongest peak in the echo signal intensity spectra of lasers with 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 a laser with a frequency of the first laser frequency, thereby enabling the receiving device 3 to receive obvious echo signal light.

[0064] In the present embodiment, after the control device 6 completes the adjustment of 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, in the present embodiment, the parameters of the first alkali metal atom filter 4 also need to be adjusted. During this process, the laser generator 1 continuously emits a laser with a laser frequency of the first laser frequency, and adjusts the parameters of the first alkali metal atom filter 4 by a step-by-step adjustment method. At this time, the control device 6 obtains the echo signal data during the parameter change process of the first alkali metal atom filter 4 through the first photoelectric converter 5, and obtains the change curve of the echo signal light intensity according to these echo signal data; the control device 6 obtains the parameter data corresponding to the maximum echo signal light intensity according to the change curve; and adjusts the parameters of the first alkali metal atom filter 4 according to the corresponding parameter data when the echo signal light intensity is maximum, so as to obtain a high signal-to-noise ratio atomic filtering effect.

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

[0066] Further, in the embodiment of the present application, the frequency stabilization device includes a second photoelectric converter 7, a second alkali metal atom filter 8 and a spectrometer 9. The spectrometer 9 is arranged at the emission end of the laser generator 1, and is used to divide 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 through the second alkali metal atom filter 8 and the second photoelectric converter 7 in sequence. The second photoelectric converter 7 is connected to the laser controller 2 in communication, wherein the parameters of the second alkali metal atom filter 8 are consistent with the parameters of the first alkali metal atom filter 4. During use, the spectrometer 9 arranged at the emission end of the laser generator 1 divides the laser into the first laser and the second laser. The first laser is used to form a laser beacon, and the second laser passes through the second alkali metal atom 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 through the data collected by the second photoelectric converter 7, thereby achieving the effect of frequency stabilization.

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

[0068] Furthermore, in the embodiment of the present application, the laser emitted by the laser generator 1 also generates a third laser through the spectrometer 9, and the wavelength meter 10 is connected to the control device 6. The wavelength meter detects the wavelength data of the third laser, and then can detect the wavelength of the laser actually 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 change of the wavelength of the laser emitted by the laser generator 1 through the wavelength meter 10. When the wavelength changes greatly, the control device 6 can make the system operation more stable by re-adjusting the parameters of the laser controller 2 and the first alkali metal atom filter 4.

[0069] Furthermore, in an embodiment of the present 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 narrow-band interference filter, and the narrow-band interference filter is placed between the receiving device 3 and the first alkali metal atom filter 4. After the receiving device 3 receives the echo signal light, the echo signal light passes through the receiving device 3, the narrow-band interference filter and the first alkali metal atom filter 4 in sequence. During this process, the narrow-band interference filter can coarsely filter the echo signal light so that the echo signal light can achieve narrower bandwidth filtering when entering the alkali metal filter.

[0070] For further information, please refer to Figure 2 In the embodiment of the present application, 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, wherein 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 in the alkali metal atom gas chamber 11; the temperature control device 13 is used to control the temperature in the alkali metal atom gas chamber 11; the first polarizer 14 and the second polarizer 15 are respectively arranged on both sides of the alkali metal atom gas chamber 11, the first polarizer 14 and the second polarizer 15 are both linear polarizers, and the polarization directions of the first polarizer 14 and the second polarizer 15 are perpendicular to each other. During use, a specific magnetic field and temperature condition are formed in the alkali metal atom gas chamber 11 by the magnetic field control device 12 and the temperature control device 13, and under the specific magnetic field and temperature condition, anomalous dispersion will cause the transmission spectrum to produce a narrow transmission band near the resonance frequency, thereby achieving a filtering effect with high spectral resolution. Secondly, the first polarizer 14 and the second polarizer 15 which are arranged 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 the magnetic field.

[0071] Furthermore, in the embodiment of the present application, the alkali metal atom gas chamber 11 is also filled with a buffer gas. By filling the alkali metal atom gas chamber 11 with the buffer gas, the transmission spectrum can be broadened and shaped.

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

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

[0074] Furthermore, in an embodiment of the present application, the high signal-to-noise ratio atomic filtering system based on the laser beacon also includes a wavefront sensor detection system 16, which 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, and extracts 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 of ordinary skill in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software depends on the specific application and constraints involved in the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0076] Among them, when the embodiment of the present application is implemented by software, it can be implemented in whole or in part in the form of a computer program product. That is, the present application implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased 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 electric carrier signals and telecommunication signals.

[0077] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A high signal-to-noise ratio atomic filtering system based on laser beacon, characterized in that: include: A laser generator, used to emit laser light to a sky region and excite atoms in the sky region to undergo resonance transition to form a laser beacon; A laser controller, which is connected to the laser generator and is used to control the wavelength and frequency of the laser emitted by the laser generator; A receiving device, used for receiving the echo signal light of the laser beacon; A first alkali metal atom filter, used for filtering out background noise light in the echo signal light received by the receiving device; A first photoelectric converter, used for converting the echo signal light into an echo signal intensity spectrum; A control device, the laser controller, the first alkali metal atom filter and the first photoelectric converter are all connected to the control device; the control device is used to analyze the echo signal intensity spectrum and control the first alkali metal atom filter and the laser controller according to the analysis results of the echo signal intensity spectrum.

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

3. The high signal-to-noise ratio atomic filtering system based on laser beacon according to claim 2 is characterized in that: The frequency stabilization device includes a second photoelectric converter, a second alkali metal atom filter and a spectrometer. The spectrometer is arranged at the emission 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 atom filter and the second photoelectric converter in sequence. The second photoelectric converter is communicatively connected to the laser controller, wherein the parameters of the second alkali metal atom filter are consistent with the parameters of the first alkali metal atom filter.

4. The high signal-to-noise ratio atomic filtering system based on laser beacon according to claim 3 is characterized in that: It also includes a wavelength meter. The laser light emitted by the laser generator also generates a third laser light through the spectrometer. The wavelength meter is connected to the control device and is used to detect wavelength data of the third laser light and transmit the wavelength data to the control device.

5. The high signal-to-noise ratio atomic filtering system based on laser beacon 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. 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 filtering system based on laser beacon according to claim 3 is characterized in that: The first alkali metal atom filter and the second alkali metal atom filter have the same structure.

7. The high signal-to-noise ratio atomic filtering system based on laser beacon according to claim 6 is characterized in that: The first alkali metal atom filter comprises: An alkali metal atom gas chamber, wherein the alkali metal atom gas chamber is filled with alkali metal atoms; A magnetic field control device, used for forming an axial magnetic field in the alkali metal atom gas chamber; A temperature control device, used to control the temperature in the alkali metal atom gas chamber; A first polarizer and a second polarizer are respectively arranged on both sides of the alkali metal atom gas chamber, the first polarizer and the second polarizer are both linear polarizers, and the polarization directions of the first polarizer and the second polarizer are perpendicular to each other.

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

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

10. The high signal-to-noise ratio atomic filtering system based on laser beacon 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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