Laser signal excitation and test device

Abstract

The utility model discloses a laser signal excitation and test device, which comprises a laser signal excitation and test unit, a master control analysis unit and an external control management unit, the laser signal excitation and test unit is electrically connected with the main control analysis unit; the main control analysis unit is in communication connection with an external control management unit; the external control management unit is used for integrated management of data processing and storage, communication and delay control, auxiliary alignment control and complex atmospheric condition simulation; and the master control analysis unit receives an instruction of the external control management unit to drive and control the laser signal excitation and test unit. The application of the laser signal excitation and test device to carry out airborne laser equipment performance test has important strategic significance for improving the striking capability of airborne photoelectric detection equipment.

Description

Technical Field

[0001] The utility model relates to the field of laser signal simulation and testing, in particular to a laser signal excitation and testing device. Background Art

[0002] In the optoelectronic detection system, the performance of the laser rangefinder and laser illuminator plays a decisive role in the detection accuracy of the system and the accuracy of the strike. In a complex airborne environment, the optoelectronic detection equipment is affected by factors such as temperature changes, flatness deviation of the onboard installation interface, and vibration. The laser emission and receiving optical axes will deviate, making it impossible for the laser spot to fully cover or even deviate from the target, resulting in a weakened laser echo or even no echo, which makes the laser ranging unstable or fails, and the distance information cannot be obtained, which will inevitably cause target detection distortion and affect the strike effectiveness of guided weapons. Carrying out laser signal excitation simulation and laser performance testing is of great strategic significance to improving the strike capability of airborne optoelectronic detection equipment. Utility Model Content

[0003] In order to solve the above problems, the utility model proposes a laser signal excitation and testing device, which can simulate and test the comprehensive performance of the laser signal.

[0004] The utility model discloses a laser signal excitation and test device, comprising a laser signal excitation and test unit, a main control analysis unit, and an external control management unit; the laser signal excitation and test unit is electrically connected to the main control analysis unit; the main control analysis unit is communicatively connected to the external control management unit; the external control management unit is used for integrated management of data processing and storage, communication and delay control, auxiliary alignment control, and complex atmospheric condition simulation; the main control analysis unit receives instructions from the external control management unit to drive and control the laser signal excitation and test unit.

[0005] In a preferred embodiment of the present invention, the laser signal excitation and testing unit adopts an integrated optical-mechanical receiving structure to achieve coaxial laser transmission and reception.

[0006] In a preferred embodiment of the present utility model, the laser signal excitation and testing unit adopts an optical-mechanical receiving split structure to achieve coaxial laser transmission and reception.

[0007] In a preferred embodiment of the present invention, the laser signal excitation and testing unit is composed of a laser detection system and an echo simulation system.

[0008] In a preferred embodiment of the utility model, the laser detection system includes a receiving window mirror, a semi-transparent and semi-reflective mirror, a dichroic mirror, an infrared reflector, an infrared laser, a CMOS camera, a first turning mirror, a high-reflection beam splitter, an indicator laser, a low-reflection beam splitter, a polarization attenuator, an equal-ratio beam splitter, a first focusing mirror, a photoelectric detector, a second focusing mirror, a near-infrared camera, a third focusing mirror, and a laser energy meter; the high-power laser emitted by the device to be tested is incident on the semi-transparent and semi-reflective mirror through the receiving window mirror and is divided into two beams of light, one of which is the first transparent The first reflected light is incident on the dichroic mirror and is incident on the CMOS camera detection spot through the dichroic mirror; the first reflected light is incident on the first turning mirror and is turned by the first turning mirror to the high-reflection beam splitter; after being transmitted through the high-reflection beam splitter, it is transmitted to the low-reflection beam splitter, and after being split by the low-reflection beam splitter, it is divided into two beams, one is the second transmitted light, and the other is the second reflected light. The second transmitted light is incident on the third focusing mirror, and after passing through the third focusing mirror, it is converged to the laser energy meter After the second reflected light enters the polarization attenuator, it is incident on the equal-ratio beam splitter after polarization attenuation; the second reflected light is divided into two beams by the equal-ratio beam splitter, one beam is the third transmitted light, and the other beam is the third reflected light; the third transmitted light enters the first focusing mirror, and is converged to the photodetector through the first focusing mirror; the third reflected light enters the second focusing mirror, and is converged to the near-infrared camera through the second focusing mirror; the laser emitted by the infrared laser is incident on the dichroic mirror after being reflected by the infrared reflector, and is then incident on the dichroic mirror after passing through the After reflection by the dichroic mirror, it is merged into the optical path of the first transmitted light and is incident on the semi-transparent and semi-reflective mirror. After transmission through the semi-transparent and semi-reflective mirror, it is incident on the receiving window mirror and is emitted through the receiving window mirror. The laser emitted by the indicator laser is incident on the high-reflection beam splitter, merged into the optical path between the first turning mirror and the high-reflection beam splitter, and is reflected by the first turning mirror into the optical path of the first reflected light, incident on the semi-transparent and semi-reflective mirror, reflected by the semi-transparent and semi-reflective mirror to the receiving window mirror and is emitted through the receiving window mirror.

[0009] In a preferred embodiment of the present invention, the semi-transparent and semi-reflective mirror is reflective at 1064nm, transmissive at 650nm, and has a beam splitting ratio of 1:1; the high-reflection beam splitter is highly reflective at 1064nm, with a beam reflectivity of 99% and anti-reflection at 650nm; the low-reflection beam splitter is low reflective at 1064nm, with a beam reflectivity of 1% and anti-reflection at 1064nm; the beam reflectivity of the equal-ratio beam splitter is 50% and the transmittance is 50%; the photodetector is a PIN-type detector with a response wavelength of 320 to 1100nm and a 3dB bandwidth of 30KHz to 1GHz; the detection lens of the laser energy meter is double-sidedly evaporated with a high-power dielectric anti-reflection film, and the aperture is greater than 90mm.

[0010] In a preferred embodiment of the present invention, the first focusing mirror, the second focusing mirror and the third focusing mirror are all double-cemented lens groups.

[0011] In a preferred embodiment of the present invention, the echo simulation system includes an emission window mirror, a reflector, a second turning mirror, a beam combining mirror, an interference light module, a rotatable polarizer, a first collimator, and an echo laser; the laser emitted by the echo laser is incident on the first collimator, collimated by the first collimator, and then incident on the rotatable polarizer, and power is controlled by the rotatable polarizer; the laser after power control is incident on the beam combining mirror; the laser emitted by the interference light module is incident on the beam combining mirror, combined with the laser after power control, and then incident on the second turning mirror, and then turned by the second turning mirror and incident on the reflector, reflected by the reflector to the emission window mirror, and emitted through the emission window mirror.

[0012] In a preferred embodiment of the present invention, the reflector is a movable reflector to adjust the position of the emitted laser and is compatible with both coaxial and non-coaxial states of laser emission and reception of the device under test.

[0013] In a preferred embodiment of the present invention, the interference light module adopts an LED array group with different light-emitting frequencies, including an LED light source, a condenser, a condenser, a reflective cavity and a second collimator; the condenser and the condenser focus the light emitted by the LED light source, narrow the divergence angle of the light, reduce the number of reflections of the light in the reflective cavity, and improve the utilization rate of the system light source; the reflective cavity fully mixes LED light of multiple bands, effectively ensuring the uniformity of the light spot; the second collimator lens plays a role in guiding light, guiding as much of the outgoing light as possible onto the effective irradiation surface to ensure the illumination requirements.

[0014] In a preferred embodiment of the present invention, the reflection cavity is designed as a cylindrical structure to ensure that light with the same emittance has the same angle when it hits any internal reflective wall. The inner wall of the reflection cavity is coated with a mirror reflective material with a reflectivity of more than 90%.

[0015] In a preferred embodiment of the present invention, the echo laser is a semiconductor programmable laser, and the semiconductor programmable laser is output through a single-mode optical fiber using an FC / APC interface via a coupling module.

[0016] In a preferred embodiment of the present invention, the semiconductor programmable laser is composed of a square wave pulse generator, a pulse driving circuit, a high-speed laser pump source, an automatic temperature control component, an optical fiber amplifier, and an external trigger port; the external trigger port receives an external control signal and transmits it to the square wave pulse generator, the square wave generator generates a matching square wave signal according to the instruction requirements, the pulse driving circuit generates corresponding voltage and current according to the square wave signal to drive the high-speed laser pump source to output a laser with a characteristic waveform, the laser is incident on the optical fiber amplifier to amplify the laser signal, and after meeting the system requirements, the optical signal is output through the FC / APC interface.

[0017] In a preferred embodiment of the present invention, the square wave pulse generator includes a pulse frequency control circuit, a pulse amplitude control circuit and a pulse width control circuit; the frequency control circuit is used to control the pulse repetition frequency and drive the switch of the pulse driving circuit to achieve the pulse repeatability requirement; the pulse width control circuit is used to control the width of the pulse driving circuit to achieve the adjustment of the output laser pulse width; the pulse amplitude control circuit is used to control the amplitude of the driving circuit to achieve the adjustment of the output laser power.

[0018] In a preferred embodiment of the present invention, the pulse drive circuit adopts a high-current MOSFET driver to meet the requirements of high current and narrow pulse width.

[0019] In a preferred embodiment of the present invention, the main control analysis unit includes an FPGA processing module, a pulse coding module, and a laser attenuation control module. The pulse signal received by the laser signal excitation and test unit is used as a trigger signal of the FPGA processing module. At the same time, the FPGA processing module starts counting. The pulse coding module performs measurements based on the FPGA processing module to control the pulse repetition frequency and drive the on / off of the pulse driving circuit in the semiconductor programmable laser to achieve the pulse repeatability requirements, and control the laser attenuation control module to attenuate the laser emission power.

[0020] In a preferred embodiment of the present invention, the laser attenuation control module is an FC / APC attenuator.

[0021] In a preferred embodiment of the present invention, the FPGA processing module multiplies the 50MHz clock signal to a 400MHz clock signal and counts the 2.5ns period of the clock signal to achieve time delay. Considering the round trip of the laser pulse, the distance simulation quantization error is ±0.38m.

[0022] In a preferred embodiment of the present invention, the external control management unit includes a control computer and control software. The control computer serves as a software platform carrier of the laser signal excitation and test unit, provides a communication interface for the main control analysis unit and implements the software's call to the communication interface driver of the main control analysis unit, thereby implementing the main control analysis unit's corresponding output control of the laser signal excitation and test unit; the control software serves as the parameter setting of the laser signal excitation and test unit and the reading and display functions of the measurement data.

[0023] Due to the adoption of the above technical solution, the laser signal excitation and testing device of the utility model can generate simulated laser main wave light signals, laser echo signals, and background light signals with agreed timing relationships and controlled characteristics through internal / external trigger control in a laboratory environment, and input them into the photoelectric detection system of the device to be tested through an optical interface to generate main wave pulses and echo pulses for the performance evaluation of the device to be tested in different development and test stages. It can also simulate the motion and energy change characteristics of the target signal, and has the ability to simulate the motion characteristics of the target source (target jitter, dodge, etc.), and the ability to simulate the atmospheric attenuation of the laser transmission path. Through calibration, it can accurately generate long-distance laser target echo information. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a composition diagram of a laser signal excitation and testing device of the utility model.

[0026] Figure 2 The utility model discloses a laser signal excitation and testing unit composition and principle diagram in a laser signal excitation and testing device.

[0027] Figure 3 The utility model discloses a composition and principle diagram of an echo laser in a laser signal excitation and testing device.

[0028] Figure 4 The utility model discloses a composition and principle diagram of an interference light module in a laser signal excitation and testing device. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, they are further described below in conjunction with the accompanying drawings and embodiments.

[0030] Please refer to Figure 1 The laser signal excitation and test device shown in the figure includes a laser signal excitation and test unit 3, a main control analysis unit 2, and an external control management unit 1; the laser signal excitation and test unit 3 adopts an integrated optical-mechanical receiving design to achieve coaxial laser transmission and reception, and can also be used in separate axes; the external control management unit 1 is used for integrated management of data processing and storage, communication and delay control, auxiliary alignment control, and complex atmospheric condition simulation; the main control analysis unit 2 receives instructions from the external control management unit 1 to drive and control the laser signal excitation and test unit 2; the laser signal excitation and test unit 3 is electrically connected to the data analysis unit 1; the main control analysis unit 2 is communicatively connected to the external control management unit 1.

[0031] Please refer to Figure 1 The main control analysis unit 2 includes an FPGA processing module 21, a pulse coding module 22, and a laser attenuation control module 23. The pulse signal received by the laser signal excitation and test unit 3 is used as a trigger signal of the FPGA processing module 21. At the same time, the FPGA processing module 21 starts counting. The pulse coding module 22 measures based on the FPGA processing module 21 to control the pulse repetition frequency and drive the on / off of the pulse driving circuit in the semiconductor programmable laser to achieve the pulse repeatability requirement, and controls the laser attenuation control module 23 to attenuate the laser emission power in the form of FC / APC attenuation;

[0032] The FPGA delay module 21 multiplies the 50MHz clock signal to a 400MHz clock signal and counts the 2.5ns period of the clock signal to achieve time delay. Considering the round trip of the laser pulse, the distance simulation quantization error is ±0.38m.

[0033] Please refer to Figure 1 The external control management unit 1 includes a control computer 11 and a control software 12. The control computer 11 is used as a software platform carrier of the laser signal excitation and test unit 3, provides a communication interface of the main control analysis unit 2 and implements the software to call the communication interface driver of the main control analysis unit 2, thereby realizing the main control analysis unit 2 to control the corresponding output of the laser signal excitation and test unit 3. The control software 12 is used for parameter setting of the laser signal excitation and test unit 3 and reading and displaying of measurement data.

[0034] Please refer to Figure 2 ,The laser signal excitation and test unit 3 is composed of a laser detection system and an echo simulation system.

[0035] The laser detection system includes a receiving window mirror 325, a semi-transparent and semi-reflective mirror 31, a dichroic mirror 38, an infrared reflector 39, an infrared laser 310, a CMOS camera 311, a turning mirror 32 (the aforementioned first turning mirror), a high-reflection beam splitter 33, an indication laser 34, a low-reflection beam splitter 35, a polarization attenuator 313, an equal-ratio beam splitter 312, a focusing mirror 314 (the aforementioned first focusing mirror), a photodetector 315, a focusing mirror 316 (the aforementioned second focusing mirror), a near-infrared camera 317, a focusing mirror 36 (the aforementioned third focusing mirror), and a laser energy meter 37.

[0036] The semi-transparent and semi-reflective mirror 31 is 1064nm reflective and 650nm transmissive, with a beam splitting ratio of 1:1; the high-reflection beam splitter 33 is 1064nm highly reflective, with a beam reflectivity of 99%, and 650nm anti-reflection; the low-reflection beam splitter 35 is 1064nm low reflective, with a beam reflectivity of 1%, and 1064nm anti-reflection; the beam reflectivity of the equal-ratio beam splitter 312 is 50%, and the transmittance is 50%; the photodetector 315 is a PIN-type detector with a response wavelength of 320 to 1100nm and a 3dB bandwidth of 30KHz to 1GHz; the detection lens of the laser energy meter 37 is double-sided evaporated with a high-power dielectric anti-reflection film, and the light aperture is greater than 90mm.

[0037] Focusing mirror 314, focusing mirror 316, focusing mirror 36 are all double cemented lens groups. The reflection cavity of focusing mirror 314, focusing mirror 316, focusing mirror 36 is designed as a cylindrical structure to ensure that the angle of light with the same emission degree hitting any internal reflective wall is the same, and the inner wall of the reflection cavity is coated with a mirror reflective material, and its reflectivity is as high as more than 90%.

[0038] The high-power laser 42 emitted by the laser emission aperture 41 of the device to be tested 4 is incident on the semi-transparent and semi-reflective mirror 31 through the receiving window mirror 325 and is divided into two beams of light, one is the transmitted light 43 (the aforementioned first transmitted light), and the other is the reflected light 44 (the aforementioned first reflected light). The transmitted light 43 is incident on the dichroic mirror 38 and is incident on the CMOS camera 311 to detect the light spot through the dichroic mirror 38; the reflected light 44 is incident on the turning mirror 32 and is turned by the turning mirror 32 to enter the high-reflection beam splitter 33, is transmitted through the high-reflection beam splitter 33 to the low-reflection beam splitter 35, and is split by the low-reflection beam splitter 35 to be divided into two beams of light, one is the transmitted light 45 (the aforementioned second transmitted light), and the other is the reflected light 46 (the aforementioned second reflected light).

[0039] The transmitted light 45 is incident on the focusing mirror 36, and is converged to the laser energy meter 37 after passing through the focusing mirror 36. The reflected light 46 is incident on the polarization attenuator 313, and is incident on the equal-score beam splitter 312 after polarization attenuation. The reflected light 46 is split into two beams by the equal-score beam splitter 312, one is the transmitted light 47 (the aforementioned third transmitted light), and the other is the reflected light 48 (the aforementioned third reflected light).

[0040] The transmitted light 47 is incident on the focusing mirror 314 and converged to the photodetector 315 through the focusing mirror 314 . The reflected light 48 is incident on the focusing mirror 316 and converged to the near-infrared camera 317 through the focusing mirror 316 .

[0041] The laser light 49 emitted by the infrared laser 324 is incident on the infrared reflector 39 and reflected, then incident on the dichroic mirror 38, and after being reflected by the dichroic mirror 38, it is merged into the optical path of the transmitted light 43 and is incident on the semi-transparent and semi-reflective mirror 31. After being transmitted by the semi-transparent and semi-reflective mirror 31, it is incident on the receiving window mirror 325 and emitted through the receiving window mirror 325.

[0042] The laser 50 emitted by the indicator laser 34 is incident on the high-reflection beam splitter 33, merged into the optical path 51 between the turning mirror 32 and the high-reflection beam splitter 33, and reflected by the turning mirror 32 to merge into the optical path of the reflected light 44, and is incident on the semi-transparent and semi-reflective mirror 31, reflected by the semi-transparent and semi-reflective mirror 31 to the receiving window mirror 325 and emitted through the receiving window mirror 325.

[0043] Continue to refer Figure 2 The echo simulation system includes an emission window mirror 326, a reflection mirror 319, a turning mirror 318 (the aforementioned second turning mirror), a beam combining mirror 320, an interference light module 322, a rotatable polarizer 321, a first collimator 323 (the aforementioned first collimator), and the laser 52 emitted by the echo laser 324 is incident on the collimator 323, and after being collimated by the collimator 323, it is incident on the rotatable polarizer 321, and power control is performed on the rotatable polarizer 321; the laser 52 after power control is incident on the beam combining mirror 320.

[0044] The laser 53 emitted by the interference light module 322 is incident on the beam combining mirror 320, combined with the power-controlled laser 52 and then incident on the turning mirror 318, and then turned by the turning mirror 318 and incident on the reflecting mirror 319, and then reflected by the reflecting mirror 319 to the transmitting window mirror 326, and then emitted through the transmitting window mirror 326 and received by the laser receiving aperture 54 of the device 4 to be tested.

[0045] The reflector 319 is a movable reflector to adjust the position of the laser emission and is compatible with both coaxial and non-coaxial states of laser emission and reception of the device under test.

[0046] Please refer to Figure 3 In one embodiment, the echo laser 324 is a semiconductor programmable laser, which is output through a coupling module via a single-mode optical fiber using an FC / APC interface 3247 .

[0047] The semiconductor programmable laser is composed of a square wave pulse generator 3242, a pulse driving circuit 3243, a high-speed laser pump source 3245, an automatic temperature control component 3244, a fiber amplifier 3246, an external trigger port 3241, and an FC / APC interface 3247; the external trigger port 3241 receives an external control signal and transmits it to the square wave pulse generator 3242, the square wave pulse generator 3242 generates a matching square wave signal according to the instruction requirements, the pulse driving circuit 3243 generates corresponding voltage and current according to the square wave signal to drive the high-speed laser pump source 3245 to output a laser with a characteristic waveform, the laser incident fiber amplifier 3246 amplifies the laser signal, and outputs the optical signal through the FC / APC interface 3247 after meeting the system requirements.

[0048] The square wave pulse generator 3242 includes a pulse frequency control circuit, a pulse amplitude control circuit and a pulse width control circuit; the frequency control circuit is used to control the pulse repetition frequency and drive the switch of the pulse driving circuit 3243 to achieve the pulse repeatability requirement; the pulse width control circuit is used to control the width of the pulse driving circuit 3243 to adjust the output laser pulse width; the pulse amplitude control circuit is used to control the amplitude of the driving circuit 3243 to adjust the output laser power.

[0049] The pulse drive circuit 3243 adopts a high-current MOSFET driver to meet the requirements of high current and narrow pulse width.

[0050] Please refer to Figure 4 In one embodiment, the interference light module uses an LED array group with different luminous frequencies, including an LED light source 3225, a condenser 3222, a condenser 3224, a reflective cavity 3221 and a collimator 3223. The condenser 3222 and the condenser 3224 condense the light emitted by the LED light source 3225, reduce the divergence angle of the light, reduce the number of reflections of the light in the reflective cavity, and improve the utilization rate of the system light source. The reflective cavity 3221 fully mixes LED lights of multiple bands to effectively ensure the uniformity of the light spot; the collimator 3223 plays a role in guiding light, guiding as much of the emitted light as possible onto the effective irradiation surface to ensure the illumination requirements.

[0051] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the description only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A laser signal excitation and testing device, characterized in that: It includes a laser signal excitation and test unit, a main control analysis unit, and an external control management unit; the laser signal excitation and test unit is electrically connected to the main control analysis unit; the main control analysis unit is communicatively connected to the external control management unit; the external control management unit is used for integrated management of data processing and storage, communication and delay control, auxiliary alignment control, and complex atmospheric condition simulation; the main control analysis unit receives instructions from the external control management unit to drive and control the laser signal excitation and test unit.

2. The laser signal excitation and testing device according to claim 1, characterized in that: The laser signal excitation and testing unit adopts an optical-mechanical receiving integrated structure to achieve coaxial laser transmission and reception.

3. The laser signal excitation and testing device according to claim 1, characterized in that: The laser signal excitation and testing unit adopts an optical-mechanical receiving split structure to achieve coaxial laser transmission and reception.

4. The laser signal excitation and testing device according to any one of claims 1 to 3, characterized in that: The laser signal excitation and testing unit is composed of a laser detection system and an echo simulation system.

5. The laser signal excitation and testing device according to claim 4, characterized in that: The laser detection system includes a receiving window mirror, a semi-transparent and semi-reflective mirror, a dichroic mirror, an infrared reflector, an infrared laser, a CMOS camera, a first turning mirror, a high-reflection beam splitter, an indicator laser, a low-reflection beam splitter, a polarization attenuator, an equal-ratio beam splitter, a first focusing mirror, a photoelectric detector, a second focusing mirror, a near-infrared camera, a third focusing mirror, and a laser energy meter; the high-power laser emitted by the device to be tested is incident on the semi-transparent and semi-reflective mirror through the receiving window mirror and is divided into two beams of light, one is a first transmitted light, and the other is a first reflected light, the first transmitted light is incident on the dichroic mirror and is incident on the CMOS camera detection spot through the dichroic mirror; the first reflected light is incident on the first turning mirror and is turned by the first turning mirror to be incident on the high-reflection beam splitter; after being transmitted through the high-reflection beam splitter, it is incident on the low-reflection beam splitter, and after being split by the low-reflection beam splitter, it is divided into two beams of light, one is a second transmitted light, and the other is a second reflected light, the second transmitted light is incident on the third focusing mirror, and after passing through the third focusing mirror, it converges to the laser energy meter, and the second reflected light is incident on the third focusing mirror. After the polarization attenuator, the light is incident on the equal-ratio beam splitter after polarization attenuation; the second reflected light is divided into two beams by the equal-ratio beam splitter, one beam is the third transmitted light, and the other beam is the third reflected light, the third transmitted light is incident on the first focusing mirror, converged to the photodetector through the first focusing mirror, and the third reflected light is incident on the second focusing mirror, and converged to the near-infrared camera through the second focusing mirror; the laser emitted by the infrared laser is incident on the dichroic mirror after being reflected by the infrared reflector, and then is reflected by the dichroic mirror, merged into the optical path of the first transmitted light and incident on the semi-transparent and semi-reflective mirror, and then is transmitted by the semi-transparent and semi-reflective mirror, and then is incident on the receiving window mirror and emitted through the receiving window mirror; the laser emitted by the indicator laser is incident on the high-reflection beam splitter, merged into the optical path between the first turning mirror and the high-reflection beam splitter, and then is reflected by the first turning mirror and merged into the optical path of the first reflected light, and then is incident on the semi-transparent and semi-reflective mirror, and then is reflected by the semi-transparent and semi-reflective mirror to the receiving window mirror and emitted through the receiving window mirror.

6. The laser signal excitation and testing device according to claim 5, characterized in that: The semi-transparent and semi-reflective mirror is reflective at 1064nm, transmissive at 650nm, and has a beam splitting ratio of 1:1; the high-reflective beam splitter is highly reflective at 1064nm, with a beam reflectivity of 99% and anti-reflective at 650nm; the low-reflective beam splitter is low reflective at 1064nm, with a beam reflectivity of 1% and anti-reflective at 1064nm; the beam reflectivity of the equal-ratio beam splitter is 50% and the transmittance is 50%; the photodetector is a PIN-type detector with a response wavelength of 320 to 1100nm and a 3dB bandwidth of 30KHz to 1GHz; the detection lens of the laser energy meter is double-sidedly evaporated with a high-power dielectric anti-reflective film, and the aperture is greater than 90mm.

7. The laser signal excitation and testing device according to claim 5, characterized in that: The first focusing mirror, the second focusing mirror and the third focusing mirror are all double-cemented lens groups.

8. The laser signal excitation and testing device according to claim 5, characterized in that: The echo simulation system includes an emission window mirror, a reflector, a second turning mirror, a beam combining mirror, an interference light module, a rotatable polarizer, a first collimator, and an echo laser; the laser emitted by the echo laser is incident on the first collimator, collimated by the first collimator, and then incident on the rotatable polarizer, and power is controlled by the rotatable polarizer; the laser after power control is incident on the beam combining mirror; the laser emitted by the interference light module is incident on the beam combining mirror, combined with the laser after power control, and then incident on the second turning mirror, turned by the second turning mirror, and then incident on the reflector, reflected by the reflector to the emission window mirror, and emitted through the emission window mirror.

9. The laser signal excitation and testing device according to claim 8, characterized in that: The reflector is a movable reflector to adjust the position of the emitted laser and is compatible with both coaxial and non-coaxial states of laser emission and reception of the device under test.

10. The laser signal excitation and testing device according to claim 8, characterized in that: The interference light module adopts an LED array group with different light emission frequencies, including an LED light source, a condenser, a condenser, a reflection cavity and a second collimator.

11. The laser signal excitation and testing device according to claim 10, characterized in that: The reflection cavity is designed as a cylindrical structure, and the inner wall of the reflection cavity is coated with a mirror reflective material.

12. The laser signal excitation and testing device according to claim 8, characterized in that: The echo laser adopts a semiconductor programmable laser, and the semiconductor programmable laser is output through a coupling module and a single-mode optical fiber using an FC / APC interface.

13. The laser signal excitation and testing device according to claim 12, characterized in that: The semiconductor programmable laser consists of a square wave pulse generator, a pulse driving circuit, a high-speed laser pump source, an automatic temperature control component, an optical fiber amplifier, and an external trigger port; the external trigger port receives an external control signal and transmits it to the square wave pulse generator, the square wave generator generates a matching square wave signal according to the instruction requirements, the pulse driving circuit generates corresponding voltage and current according to the square wave signal to drive the high-speed laser pump source to output a laser with a characteristic waveform, the laser incident optical fiber amplifier amplifies the laser signal, and outputs the optical signal through the FC / APC interface after meeting the system requirements.

14. The laser signal excitation and testing device according to claim 13, characterized in that: The square wave pulse generator includes a pulse frequency control circuit, a pulse amplitude control circuit and a pulse width control circuit; the frequency control circuit is used to control the pulse repetition frequency and drive the switch of the pulse driving circuit to achieve the pulse repeatability requirement; The pulse width control circuit is used to control the width of the pulse driving circuit to adjust the output laser pulse width; the pulse amplitude control circuit is used to control the amplitude of the driving circuit to adjust the output laser power.

15. The laser signal excitation and testing device according to claim 13, characterized in that: The pulse drive circuit adopts a high-current MOSFET driver to meet the requirements of high current and narrow pulse width.

16. The laser signal excitation and testing device according to any one of claims 1 to 3, characterized in that: The main control and analysis unit includes an FPGA processing module, a pulse coding module, and a laser attenuation control module. The pulse signal received by the laser signal excitation and test unit is used as a trigger signal of the FPGA processing module. At the same time, the FPGA processing module starts counting. The pulse coding module performs measurements based on the FPGA processing module to control the pulse repetition frequency and drive the on / off of the pulse driving circuit in the semiconductor programmable laser to achieve the pulse repeatability requirements, and control the laser attenuation control module to attenuate the laser emission power.

17. The laser signal excitation and testing device according to claim 16, characterized in that: The laser attenuation control module is an FC / APC attenuator.

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