Laser communication optical axis detection device and laser communication optical axis detection method

Abstract

The application provides a laser communication optical axis detection device and a laser communication optical axis detection method, and relates to the technical field of optical axis detection. In the device, a reference light emitter is used for emitting reference light; a first light splitting prism is used for receiving the reference light and transmitting the reference light to output first transmitted light along a first transmitted light path, and receiving communication laser and transmitting the communication laser to output second transmitted light along a second transmitted light path perpendicular to the first transmitted light path; a return prism is located on the first transmitted light path, a mirror is located on a reflected light path of the first light splitting prism, a beam-reducing assembly is located on a reflected light path of the mirror, and a second light splitting prism is located on an emergent light path of the beam-reducing assembly; a first detector for detecting long-distance optical axis coaxiality is located on a transmitted light path of the second light splitting prism; and a second detector for detecting short-distance optical axis coaxiality is located on a reflected light path of the second light splitting prism. The application can realize field test and experiment measurement of laser communication load.

Description

Technical Field

[0001] This invention relates to the field of optical axis detection technology, and in particular to a laser communication optical axis detection device and a laser communication optical axis detection method. Background Technology

[0002] With the development of the aerospace industry, laser communication payloads have also experienced rapid growth. Simultaneously, the requirements for laser communication payloads are becoming increasingly stringent, including technical requirements for miniaturization, lightweight design, beam quality, and coaxial accuracy. In practice, when measuring these parameters, we can only use traditional indoor methods, such as using a fixed collimator in a laboratory to measure beam quality and coaxial accuracy. This measurement method is clearly unsuitable for field testing of laser communication payloads or for participation in pre- and post-experimental testing of satellite mechanics outdoors, resulting in numerous limitations in the measurement of laser communication payloads. Summary of the Invention

[0003] This invention provides a laser communication optical axis detection device and a laser communication optical axis detection method to solve the shortcomings of the prior art in which the indicators of laser communication load cannot be measured efficiently and accurately in field testing experiments, and to achieve the goal of measuring the indicators of laser communication load efficiently and accurately in field testing experiments.

[0004] This invention provides a laser communication optical axis detection device, comprising: a reference light emitter, a first beam splitter, a return prism, a reflector, a beam shrinking assembly, a second beam splitter, a first detector, and a second detector; the reference light emitter is used to emit reference light; the first beam splitter is located on the output optical path of the reference light and on the output optical path of the laser communication payload under test; the first beam splitter is used to receive the reference light and transmit the reference light, outputting a first transmitted light transmitted along a first transmitted optical path; the first beam splitter is also used to receive the laser communication payload under test. The system emits a communication laser and transmits it, outputting a second transmitted light that travels along a second transmission optical path. The first transmission optical path is perpendicular to the second transmission optical path. A reflector is located on the first transmission optical path, a mirror is located on the reflected optical path of the first beam splitter, a beam shrinking component is located on the reflected optical path of the mirror, and a second beam splitter is located on the output optical path of the beam shrinking component. A first detector is located on the transmission optical path of the second beam splitter and is used to detect the coaxiality of the long-range optical axis. A second detector is located on the reflected optical path of the second beam splitter and is used to detect the coaxiality of the short-range optical axis.

[0005] According to the present invention, a laser communication optical axis detection device is provided, which further includes: a reflecting converging mirror; the reflecting converging mirror is disposed between a second beam splitter and a first detector, and the first detector is located at the focal point of the reflecting converging mirror.

[0006] According to the present invention, a laser communication optical axis detection device is provided, wherein the reflector is a polarization-maintaining reflector.

[0007] According to the present invention, a laser communication optical axis detection device is provided, wherein the polarization contrast of the polarization-maintaining reflector is greater than or equal to 2000:1.

[0008] According to the present invention, a laser communication optical axis detection device is provided, wherein the first pixel size of the first detector is smaller than the second pixel size of the second detector.

[0009] According to the present invention, a laser communication optical axis detection device is provided, wherein the size of the first pixel is less than or equal to 5µm and the size of the second pixel is greater than or equal to 15µm.

[0010] According to the present invention, a laser communication optical axis detection device is provided, wherein the transmission-to-reflection ratio of the first beam splitter and the second beam splitter is 1:1.

[0011] According to the present invention, a laser communication optical axis detection device is provided, wherein the beam output by the beam-shrinking component is a collimated beam.

[0012] The present invention also provides a laser communication optical axis detection method applied to the above-mentioned laser communication optical axis detection device, comprising: placing the laser communication load to be tested in the incident optical path of a first beam splitter; the light beam incident on the first beam splitter along the incident optical path is transmitted along a second transmission optical path after being transmitted by the first beam splitter; correcting the placement position of the laser communication load to be tested based on the reference light emitted by the reference light emitter; controlling the laser communication load to emit multiple different types of communication lasers sequentially, and obtaining the centroid position of the light spot on the first detector and the second detector when emitting each type of communication laser; and obtaining the coaxial detection result of multiple different types of communication lasers according to the centroid position of the light spot on the first detector and the second detector when emitting each type of communication laser.

[0013] According to the laser communication optical axis detection method provided by the present invention, multiple different types of communication lasers include: beacon communication lasers, transmitting communication lasers, and receiving communication lasers.

[0014] The present invention provides a laser communication optical axis detection device and a laser communication optical axis detection method. The laser communication optical axis detection device includes: a reference light emitter, a first beam splitter, a return prism, a reflector, a beam shrinking assembly, a second beam splitter, a first detector, and a second detector. The reference light emitter is used to emit reference light. The first beam splitter is located on the output optical path of the reference light and on the output optical path of the laser communication payload being measured. The first beam splitter is used to receive the reference light and transmit it, outputting a first transmitted light that propagates along a first transmitted optical path. The first beam splitter is also used for... The device receives and transmits the communication laser emitted by the laser communication payload under test, outputting a second transmitted light that travels along a second transmission optical path. The first and second transmission optical paths are perpendicular. A return prism is located on the first transmission optical path, a reflector is located on the reflection optical path of the first beam splitter, a beam shrinking component is located on the reflection optical path of the reflector, and a second beam splitter is located on the output optical path of the beam shrinking component. A first detector is located on the transmission optical path of the second beam splitter and is used to detect the long-range optical axis coaxiality. A second detector is located on the reflection optical path of the second beam splitter and is used to detect the short-range optical axis coaxiality. The laser communication optical axis detection device in this embodiment is simple in structure and easy to carry. It can effectively assist users in detecting the optical axis coaxiality of laser communication payloads in field testing experiments, effectively solving the problem in existing technologies where it is impossible to efficiently and accurately measure the indicators of laser communication payloads in field testing experiments, thus achieving the goal of efficiently and accurately measuring the indicators of laser communication payloads in field testing experiments. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is one of the structural schematic diagrams of the laser communication optical axis detection device provided by the present invention.

[0017] Figure 2 This is the second schematic diagram of the structure of the laser communication optical axis detection device provided by the present invention.

[0018] Figure 3 This is a schematic diagram of the beam-shrinking component in the laser communication optical axis detection device provided by the present invention.

[0019] Figure 4 This is a flowchart of the laser communication optical axis detection method provided by the present invention.

[0020] Figure label:

[0021] 100: Laser communication optical axis detection device; 110: Reference light emitter; 1101: Optical fiber; 1102: First collimating lens; 120: First beam splitter prism; 130: Echo prism; 140: Reflector; 150: Beam shrinking assembly; 1501: Beam shrinking lens group; 1502: Second collimating lens; 160: Second beam splitter prism; 170: First detector; 180: Second detector; 190: Reflecting convergent mirror; 200: Laser communication payload. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] The following is combined Figures 1-3 The laser communication optical axis detection device of the present invention is described.

[0024] Figure 1 This is one of the structural schematic diagrams of the laser communication optical axis detection device provided by the present invention. For example... Figure 1 As shown, the laser communication optical axis detection device 100 includes: a reference light emitter 110, a first beam splitter 120, a back wave prism 130, a reflector 140, a beam shrinking assembly 150, a second beam splitter 160, a first detector 170, and a second detector 180.

[0025] like Figure 1 As shown, the reference light emitter 110 is used to emit reference light.

[0026] The reference light transmitter 110 may include an optical fiber 1101 and a first collimating lens 1102. The optical fiber 1101 is used to emit a diverging optical fiber beam. The first collimating lens 1102 is used to receive the optical fiber beam emitted by the optical fiber 1101 and convert it into a corresponding collimated beam output.

[0027] In some embodiments, the performance parameters of the reference light emitter 110 are as follows: operating wavelength 450nm-20µm, focal length 25.4mm, off-axis distance 50.8mm, and aperture 25.4mm.

[0028] The wavelength range of the fiber beam emitted by fiber optic cable 1101 is 980nm-1650nm. The interface of fiber optic cable 1011 is FC / APC (Ferrule Connector / Angled Physical Contact).

[0029] like Figure 1 As shown, the first beam splitter 120 is located on the output light path of the reference light and on the output light path of the laser communication payload 200 under test.

[0030] like Figure 1 As shown, the first beam splitter 120 is used to receive reference light and transmit the reference light, and output the first transmitted light that is transmitted along the first transmission optical path.

[0031] The first beam splitter prism 120 is also used to receive the communication laser emitted by the laser communication payload 200 under test and transmit the communication laser, outputting a second transmitted light that travels along the second transmission optical path. The first transmission optical path is perpendicular to the second transmission optical path.

[0032] like Figure 1 As shown, the echo prism 130 is located on the first transmitted light path and is used to receive the first transmitted light and reflect the first transmitted light, and output the first reflected light to the first beam splitter 120.

[0033] The echo prism 130 is used to rotate the incident light by 180° before it exits.

[0034] The reflector 140 is located on the reflected light path of the first beam splitter 120, and is used to receive the second transmitted light and reflect the second transmitted light, and output the second reflected light to the beam-contracting assembly 150.

[0035] The beam-shrinking assembly 150 is located in the reflected light path of the reflector 140 and is used to receive the second reflected light output from the reflector 140 and to beam the second reflected light.

[0036] The second beam splitter 160 is located in the output light path of the beam shrinking assembly. It is used to receive the output light emitted from the beam shrinking assembly 150, reflect the output light to output a third reflected light, and transmit the output light to output a third transmitted light.

[0037] The first detector 170 is located in the transmission light path of the second beam splitter 160 and is used to receive the third transmitted light output by the second beam splitter 160 in order to detect the coaxiality of the remote optical axis.

[0038] The second detector 180 is located on the reflected light path of the second beam splitter 160 and is used to receive the third reflected light output by the second beam splitter 160 to detect the short-range optical axis coaxiality.

[0039] In some embodiments, such as Figure 2 As shown, the laser communication optical axis detection device 100 also includes a reflecting converging mirror 190.

[0040] The reflecting converging mirror 190 is disposed between the second beam splitter 160 and the first detector 170, and the first detector 170 is located at the focal point of the reflecting converging mirror 190.

[0041] In some embodiments, the reflector 140 is a polarization-maintaining reflector.

[0042] In some examples, the polarization contrast of the polarization-maintaining mirror is greater than or equal to 2000:1.

[0043] In some embodiments, the first pixel size of the first detector 170 is smaller than the second pixel size of the second detector 180.

[0044] In some examples, the first pixel size is less than or equal to 5µm, and the second pixel size is greater than or equal to 15µm.

[0045] In some embodiments, the transmission-to-reflection ratio of the first beam splitter 120 and the second beam splitter 120 is 1:1.

[0046] In some embodiments, the beam output by the beam-constricting assembly 150 is a collimated beam.

[0047] like Figure 1 and Figure 3 As shown, the beam-shrinking assembly 150 may include a beam-shrinking lens group 1501 and a second collimating lens 1502 arranged sequentially along the light transmission direction. The beam-shrinking lens group 1501 is used to shrink the second reflected light received from the reflector 140. The beam-shrinking light enters the second collimating lens 1502, and the second collimating lens 1502 is used to convert the received beam into a collimated beam and output it.

[0048] In some embodiments, such as Figure 1 As shown, the beam-contraction lens group 1501 may include a lens.

[0049] In some embodiments, such as Figure 3 As shown, the beam-shrinking lens group 1501 may include two lenses, thereby shortening the length of the beam-shrinking assembly 150 and making the laser communication optical axis detection device smaller and more portable.

[0050] The wavelength range of the first beam splitter 120 and the second beam splitter 160 is 900nm-1600nm, and the surface accuracy RMS≤1 / 30λ@632.8nm.

[0051] When the reflector 140 is a polarization-maintaining reflector, the polarization-maintaining reflector adopts a polarization-maintaining coating mode, and the surface accuracy RMS≤1 / 50λ@632.8nm.

[0052] The beam-shrinking component 150 operates in the 1530nm-1570nm band with a beam-shrinking ratio greater than 5. The surface profile accuracy of the beam-shrinking component 150 is RMS≤1 / 15λ@632.8nm.

[0053] The first detector 170 operates in the wavelength range of 400nm-1700nm. The size of each first pixel on the first detector 170 can be 5µm, and the size of the photosensitive surface of the first detector 170 can be 5.12mm x 6.4mm.

[0054] The second detector 180 operates in the wavelength range of 900nm-1600nm. The size of each second pixel on the second detector 180 can be 15µm, and the size of the photosensitive surface of the second detector 180 can be 6.4mm x 5.12mm.

[0055] In specific implementation, the first detector 170 may be, for example, a large-area shortwave detector, and the second detector 180 may be, for example, a small-pixel shortwave detector.

[0056] The reflecting converging mirror 190 can be an off-axis parabolic mirror with a focal length of 25mm, an aperture of 10mm, and a surface accuracy of RMS≤1 / 30λ@632.8nm.

[0057] The laser communication optical axis detection device provided by this invention includes: a reference light emitter, a first beam splitter, a back-wave prism, a reflector, a beam-shrinking assembly, a second beam splitter, a first detector, and a second detector; the reference light emitter is used to emit reference light; the first beam splitter is located on the outgoing optical path of the reference light and on the outgoing optical path of the laser communication payload under test; the first beam splitter is used to receive the reference light and transmit it, outputting a first transmitted light transmitted along a first transmission optical path; the first beam splitter is also used to receive the communication laser emitted by the laser communication payload under test and transmit it, outputting a second transmitted light transmitted along a second transmission optical path; the first transmission optical path and the second transmission optical path are perpendicular; the back-wave prism is located on the first transmission optical path, the reflector is located on the reflected optical path of the first beam splitter, the beam-shrinking assembly is located on the reflected optical path of the reflector, and the second beam splitter is located on the outgoing optical path of the beam-shrinking assembly; the first detector is located on the transmission optical path of the second beam splitter and is used to detect the coaxiality of the long-range optical axis; the second detector is located on the reflected optical path of the second beam splitter and is used to detect the coaxiality of the short-range optical axis. The laser communication optical axis detection device in this embodiment of the invention has a simple structure and is easy to carry. It can effectively assist users in detecting the coaxiality of the optical axis of the laser communication load in field testing experiments. It effectively solves the problem that the existing technology cannot efficiently and accurately measure the indicators of the laser communication load in field testing experiments, and achieves the goal of efficiently and accurately measuring the indicators of the laser communication load in field testing experiments.

[0058] In addition, the laser communication optical axis detection device provided in this embodiment of the invention can be an integrated design, which can effectively reduce assembly errors and ensure measurement accuracy.

[0059] The laser communication optical axis detection device provided in this embodiment of the invention can accurately measure the absolute direction of a remote light spot, that is, the absolute direction of the light spot after it has traveled a long distance, effectively assisting in the tracking and identification of beacon light spots in satellite laser communication.

[0060] The embodiments of the present invention can measure the optical axis coaxiality of miniaturized laser communication payloads of different wavelengths, bringing many conveniences to the detection of the optical axis coaxiality of miniaturized laser communication payloads.

[0061] The following describes the laser communication optical axis detection method used in this embodiment of the invention for measuring optical axis coaxiality based on a laser communication optical axis detection device.

[0062] Figure 4 This is a flowchart of the laser communication optical axis detection method provided in an embodiment of the present invention. Figure 4 As shown, the method includes the following steps S410~S440.

[0063] S410: The laser communication payload to be measured is placed on the incident light path of the first beam splitter; the light beam incident on the first beam splitter along the incident light path is transmitted by the first beam splitter and then transmitted along the second transmission light path.

[0064] like Figure 1 As shown, the laser communication payload 200 to be tested is placed in the area in front of the first beam splitter 160 (e.g., Figure 1 (The shaded area is shown in the middle). In this case, after the laser communication payload 200 under test emits a communication laser, the communication laser can enter the first beam splitter along the incident light path of the first beam splitter, and after being transmitted by the first beam splitter, it is transmitted along the second transmission light path.

[0065] S420: Based on the reference light emitted by the reference light transmitter, the placement position of the laser communication payload under test is corrected.

[0066] Before performing optical axis coaxiality testing, combined with Figure 1 As shown, the reference light emitter 110 can be turned on first to emit reference light. This reference light is transmitted through the first beam splitter 120, enters the echo prism 130, is reflected by the echo prism 130, enters the reflector 140, is reflected by the reflector 140, enters the beam-shrinking assembly 150, is beam-shrinked by the beam-shrinking assembly 150, and then enters the second beam splitter 160. The transmission image through the second beam splitter 160 is imaged onto the photosensitive surface of the first detector 170 (or, as shown in the image). Figure 2In the laser communication optical axis detection device shown, the light beam entering the second beam splitter 160 is transmitted through the second beam splitter 160 into the reflecting converging mirror 190, focused by the reflecting converging mirror 190 onto the photosensitive surface of the first detector 170, and reflected by the second beam splitter 160 onto the photosensitive surface of the second detector 180. In this case, the laser communication payload under test is turned on, and the laser communication payload 200 is controlled to emit any type of communication laser (e.g., beacon, receiver, or transmitter). This communication laser is transmitted through the first beam splitter 120 into the reflecting mirror 140, reflected by the reflecting mirror 140 into the beam-shrinking assembly 150, and then shrunken by the beam-shrinking assembly 150 into the second beam splitter 160. The light beam is then transmitted through the second beam splitter 160 onto the photosensitive surface of the first detector 170 (or onto the photosensitive surface of the second detector 180, as shown in the diagram). Figure 2 In the laser communication optical axis detection device shown, the light beam entering the second beam splitter 160 is transmitted through the second beam splitter 160 and enters the reflecting converging mirror 190. It is then focused and imaged onto the photosensitive surface of the first detector 170 by the reflecting converging mirror 190, and finally reflected and imaged onto the photosensitive surface of the second detector 180 by the second beam splitter 160. The positional error between the image of the communication laser on the photosensitive surface of the first detector 170 and the image of the reference light on the photosensitive surface of the first detector 170 is obtained. If the positional error is greater than a set threshold, it indicates that the positional error between the image of the communication laser on the photosensitive surface of the first detector 170 and the image of the reference light on the photosensitive surface of the first detector 170 is large. To reduce this error, the area in front of the first beam splitter 160 (e.g., ...) is... Figure 1 and Figure 2 In the shaded area shown, the laser communication load 200 is translated in at least one direction (front, back, left, right), and at the same time, the position error between the image of the communication laser on the photosensitive surface of the first detector 170 and the image of the reference light on the photosensitive surface of the first detector 170 is obtained. If the position error is less than or equal to the above-mentioned set threshold, the movement of the laser communication load 200 is stopped, and the placement position of the laser communication load under test is corrected.

[0067] The method for setting the threshold and obtaining the above-mentioned position error can be set by those skilled in the art according to the actual situation, and the embodiments of the present invention do not limit this.

[0068] S430: Controls the laser communication payload to sequentially emit multiple different types of communication lasers, and obtains the centroid position of the light spot on the first and second detectors when emitting each type of communication laser.

[0069] For example, multiple different types of communication lasers may include: beacon communication lasers, transmitting communication lasers, and receiving communication lasers. In this case, the laser communication payload 200 can be controlled to sequentially transmit beacon communication lasers, transmit communication lasers, and receive communication lasers.

[0070] When performing remote optical axis coaxial measurement, with Figure 2 Taking the laser communication optical axis detection device 100 as an example, the laser communication payload 200 first emits a beacon communication laser. This beacon communication laser is transmitted through the first beam splitter 120, enters the reflector 140, is reflected by the reflector 140, enters the beam-shrinking assembly 150, is shrunken by the beam-shrinking assembly 150, enters the second beam splitter 160, is transmitted through the second beam splitter 160, enters the reflecting converging mirror 190, and is focused by the reflecting converging mirror 190 onto the photosensitive surface of the first detector 170. After this, the laser communication payload 200 is controlled to sequentially emit the aforementioned transmitting communication laser and the aforementioned receiving communication laser.

[0071] When transmitting the aforementioned beacon communication laser, the first centroid position of the light spot imaged on the first detector is obtained; when transmitting the aforementioned transmitting communication laser, the second centroid position of the light spot imaged on the first detector is obtained; when transmitting the aforementioned receiving communication laser, the third centroid position of the light spot imaged on the first detector is obtained, so that in subsequent steps (corresponding to S440), the measurement results of remote optical axis coaxial measurement can be obtained based on the first centroid position, the second centroid position, and the third centroid position.

[0072] When performing near-field optical axis coaxial measurements, with Figure 2 Taking the laser communication optical axis detection device 100 as an example, the laser communication payload 200 first emits a beacon communication laser. This beacon communication laser is transmitted through the first beam splitter 120, enters the reflector 140, and is reflected by the reflector 140 into the beam-shrinking assembly 150. After being shrunken by the beam-shrinking assembly 150, it enters the second beam splitter 160 and is reflected by the second beam splitter 160 onto the photosensitive surface of the second detector 180. After this, the laser communication payload 200 is controlled to sequentially emit the aforementioned transmitting communication laser and the aforementioned receiving communication laser.

[0073] When emitting the aforementioned beacon communication laser, the fourth centroid position of the light spot imaged on the second detector is obtained; when emitting the aforementioned transmitting communication laser, the fifth centroid position of the light spot imaged on the second detector is obtained; when emitting the aforementioned receiving communication laser, the sixth centroid position of the light spot imaged on the second detector is obtained, so that in subsequent steps (corresponding to S440), the measurement results of near-field optical axis coaxial measurement can be obtained based on the third, fourth, and fifth centroid positions.

[0074] It should be noted that the aforementioned transmitting communication laser refers to the communication laser emitted by the laser communication payload 200 itself during operation, and the aforementioned receiving communication laser refers to the communication laser received by the laser communication payload 200 itself during operation. Since the laser communication payload 200 is not the source of the aforementioned receiving communication laser, during testing, in order to enable the laser communication payload 200 to emit the corresponding receiving communication laser, the receiving detector and receiving optical fiber of the laser communication payload 200 can be separated. By emitting laser light at the location of the receiving optical fiber, the receiving communication laser can be imaged on both the first and second detectors.

[0075] Of course, it is understood that the above only illustrates the case of multiple different types of communication lasers, including beacon communication lasers, transmitting communication lasers, and receiving communication lasers. In specific implementations, multiple different types of communication lasers include, but are not limited to, the case in the above example. For example, there may be two different types of communication lasers, or there may be only transmitting communication lasers and receiving communication lasers.

[0076] S440: Based on the centroid positions of the light spots on the first and second detectors when each type of communication laser is emitted, obtain the coaxial detection results of multiple different types of communication lasers.

[0077] Taking the example in S430, the first detector 170 can acquire the first position deviation between the first centroid position, the second centroid position, and the third centroid position, and determine the first position deviation as the detection result of the remote optical axis coaxiality. After acquiring the first position deviation, the first detector 170 can also analyze the degree of remote optical axis deviation based on the first position deviation, and output the analysis result of the degree of remote optical axis deviation as the detection result of the remote optical axis coaxiality.

[0078] Taking the example in S430, the second detector 180 can acquire the second position deviation between the fourth, fifth, and sixth centroid positions, and determine the second position deviation as the detection result of the near-field optical axis coaxiality. Alternatively, after acquiring the second position deviation, the second detector 180 can analyze the degree of near-field optical axis deviation based on the second position deviation, and output the analysis result of the degree of near-field optical axis deviation as the detection result of the near-field optical axis coaxiality.

[0079] In some embodiments, the first detector 170 can also perform spot quality analysis on the imaged spot on its photosensitive surface and output the spot quality analysis result. The second detector 180 can also perform spot quality analysis on the imaged spot on its photosensitive surface and output the spot quality analysis result.

[0080] In some embodiments, the second detector 180 may also measure the size of the light spot imaged on its photosensitive surface and record the size of the light spot imaged on the photosensitive surface of the second detector 180. Based on the light spot size, the divergence angle of the current type of communication laser emitted by the laser communication payload under test can be obtained through relevant calculations, assisting relevant personnel in obtaining divergence angle data.

[0081] Therefore, the laser communication optical axis detection method provided in this embodiment of the invention is based on a laser communication optical axis detection device. Its detection process is simple and efficient. Furthermore, based on the simple structure and portability of the laser communication optical axis detection device, this laser communication optical axis detection method can effectively assist users in detecting the coaxiality of the optical axis of the laser communication load in field testing experiments. It effectively solves the problem in the prior art that it is impossible to efficiently and accurately measure the indicators of the laser communication load in field testing experiments, and achieves the goal of efficiently and accurately measuring the indicators of the laser communication load in field testing experiments.

[0082] In summary, the laser communication optical axis detection device and method provided by this invention include: a reference light emitter, a first beam splitter, a back-echo prism, a reflector, a beam-shrinking assembly, a second beam splitter, a first detector, and a second detector; the reference light emitter is used to emit reference light; the first beam splitter is located on the outgoing optical path of the reference light and on the outgoing optical path of the laser communication payload being measured; the first beam splitter is used to receive the reference light and transmit it, outputting first transmitted light transmitted along the first transmission optical path; the first beam splitter also... The laser communication load is used to receive and transmit the communication laser emitted by the laser communication load under test, and output a second transmitted light that travels along a second transmission optical path. The first transmission optical path is perpendicular to the second transmission optical path. A return prism is located on the first transmission optical path, a reflector is located on the reflection optical path of the first beam splitter, a beam shrinking component is located on the reflection optical path of the reflector, and a second beam splitter is located on the output optical path of the beam shrinking component. A first detector is located on the transmission optical path of the second beam splitter and is used to detect the coaxiality of the long-range optical axis. A second detector is located on the reflection optical path of the second beam splitter and is used to detect the coaxiality of the short-range optical axis. In the laser communication optical axis detection method, the laser communication load is controlled to emit multiple different types of communication lasers sequentially. The centroid positions of the light spots on the first and second detectors are obtained when each type of communication laser is emitted. Based on the centroid positions of the light spots on the first and second detectors when each type of communication laser is emitted, the coaxial detection results of multiple different types of communication lasers are obtained. Therefore, the laser communication optical axis detection device in this embodiment of the invention has a simple structure and is easy to carry. It can effectively assist users in detecting the coaxiality of the optical axis of the laser communication load in field testing experiments. It effectively solves the problem that the existing technology cannot efficiently and accurately measure the indicators of the laser communication load in field testing experiments, and achieves the goal of efficiently and accurately measuring the indicators of the laser communication load in field testing experiments.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A laser communication optical axis detection device, characterized in that, include: A reference light emitter, a first beam splitter, a back-wave prism, a reflector, a beam-shrinking assembly, a second beam splitter, a first detector, and a second detector; The reference light emitter is used to emit reference light; The first beam splitter is located on the output optical path of the reference light and on the output optical path of the laser communication payload under test. The first beam splitter is used to receive the reference light and transmit the reference light, outputting a first transmitted light that travels along a first transmission optical path. The first beam splitter is also used to receive the communication laser emitted by the laser communication payload under test and transmit the communication laser, outputting a second transmitted light that travels along a second transmission optical path. The first transmission optical path is perpendicular to the second transmission optical path. The echo prism is located on the first transmitted light path. The echo prism is used to rotate the incident first transmitted light by 180° and reflect it back to the first beam splitter as the first reflected light. The first beam splitter is also used to receive the first reflected light reflected back from the echo prism and merge the first reflected light and the second transmitted light into the same reflected light path. The reflector is located on the reflected light path of the first beam splitter, the beam shrinking component is located on the reflected light path of the reflector, and the second beam splitter is located on the output light path of the beam shrinking component. The first detector is located on the transmission light path of the second beam splitter and is used to detect the coaxiality of the remote optical axis; The second detector is located on the reflected light path of the second beam splitter and is used to detect the short-range optical axis coaxiality.

2. The laser communication optical axis detection device according to claim 1, characterized in that, Also includes: Reflecting converging mirror; The reflecting converging mirror is disposed between the second beam splitter and the first detector, and the first detector is located at the focal point of the reflecting converging mirror.

3. The laser communication optical axis detection device according to claim 1, characterized in that, The reflector is a polarization-maintaining reflector.

4. The laser communication optical axis detection device according to claim 3, characterized in that, The polarization contrast ratio of the polarization-maintaining mirror is greater than or equal to 2000:

1.

5. The laser communication optical axis detection device according to claim 2, characterized in that, The first pixel size of the first detector is smaller than the second pixel size of the second detector.

6. The laser communication optical axis detection device according to claim 5, characterized in that, The first pixel size is less than or equal to 5 μm, and the second pixel size is greater than or equal to 15 μm.

7. The laser communication optical axis detection device according to claim 1, characterized in that, The transmission-to-reflection ratio of the first beam splitter and the second beam splitter is 1:

1.

8. The laser communication optical axis detection device according to claim 1, characterized in that, The beam output by the beam-shrinking component is a collimated beam.

9. A laser communication optical axis detection method applied to the laser communication optical axis detection device as described in any one of claims 1-8, characterized in that, include: The laser communication payload to be measured is placed in the incident light path of the first beam splitter; The light beam incident on the first beam splitter along the incident light path is transmitted through the first beam splitter and then propagates along the second transmission light path. The placement position of the laser communication payload under test is corrected based on the reference light emitted by the reference light emitter. The laser communication payload is controlled to emit multiple different types of communication lasers sequentially, and the centroid position of the light spot on the first and second detectors is obtained when each type of communication laser is emitted. Based on the centroid positions of the light spots on the first and second detectors when each type of communication laser is emitted, the coaxial detection results of the multiple different types of communication lasers are obtained.

10. The laser communication optical axis detection method according to claim 9, characterized in that, The various types of communication lasers include: beacon communication lasers, transmitting communication lasers, and receiving communication lasers.

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