Experimental device capable of measuring imaging quality and laser damage threshold of optical system

Abstract

The invention discloses an experimental device capable of measuring the imaging quality and laser damage threshold of an optical system, and relates to the technical field of optical systems, in the device, a first diaphragm and a second diaphragm are used for collimating a light path and limiting the size of light spots entering an attenuation imaging-energy detection system; the first diaphragm and the second diaphragm are cooperated with the reflector group to realize the adjustment of an optical path; the second diaphragm is used for limiting the size of a light spot incident to the dual-detection system; and the attenuation imaging-energy detection system obtains the energy and the imaging effect of the laser beam output by the second diaphragm. Through the cooperation of the diaphragm assembly and the reflector assembly, the dimension of light path adjustment is effectively expanded, and the light path is easier to adjust and collimate; the point spread function measurement of the optical system under different distances can be realized in a limited experimental site through the attenuation piece and the reflector assembly, and the test of the laser damage threshold of the optical system can be completed without changing the light path.

Description

Technical Field

[0001] The present application relates to the technical field of optical systems, and in particular to an experimental device capable of measuring the imaging quality and laser damage threshold of an optical system. Background Art

[0002] Optoelectronic imaging systems, with their advantages of high spatial resolution, real-time imaging capabilities, and simple and reliable structure, have been widely used in various fields, including scientific research, industry, daily life, and national security. To ensure image quality, traditional optoelectronic imaging systems typically place the image sensor near the optical focal plane. However, due to the extremely high optical gain in this region, the laser damage threshold of conventional optoelectronic imaging systems is relatively low, making them susceptible to laser damage.

[0003] In optical systems, the surface processing accuracy of optical elements and the size of the imaging aperture will limit the imaging effect, leading to problems such as aberrations and high-frequency cutoff during the imaging process. In addition, factors such as the pixel size and spacing of the image detector and the characteristics of the photosensitive material will also have a significant impact on the imaging resolution, signal sampling density and image signal-to-noise ratio. In order to fully characterize these influencing factors, the point spread function (PSF) was introduced as a comprehensive tool to describe the imaging process. The point spread function describes the response of a point light source at the target on the imaging plane, reflects the optical system's ability to resolve point light sources, and is a key indicator for measuring the imaging performance of an optical system.

[0004] With the continuous development of high-energy, high-power laser source technology and its widespread application in numerous fields, the risk of laser damage to optical systems is increasing. In this context, the laser damage threshold (LDT) has become an important technical parameter for evaluating the damage resistance of optical systems. This invention aims to provide a device that can simultaneously measure the point spread function (PSF) and LDT of an optical system, thereby comprehensively evaluating the imaging quality and damage resistance of the optical system. Summary of the Invention

[0005] The purpose of this application is to provide an experimental device that can measure the imaging quality and laser damage threshold of an optical system, which can measure both the imaging quality and the laser damage threshold of the optical system.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] The present application provides an experimental device capable of measuring the imaging quality and laser damage threshold of an optical system, comprising: a laser source, a first aperture, a reflector assembly, a second aperture, and an attenuation imaging-energy detection system arranged in sequence along an optical path;

[0008] The laser source is used to emit a laser beam as a light source for the experiment;

[0009] The first aperture is used to output the laser beam output by the laser source to the reflector assembly;

[0010] The reflector assembly is used to reflect the laser beam output by the first aperture to the second aperture;

[0011] The second aperture is used to output the laser beam output by the reflector assembly to the attenuation imaging-energy detection system;

[0012] The first aperture and the second aperture are used to collimate the optical path and limit the size of the light spot entering the attenuation imaging-energy detection system; the first aperture and the second aperture cooperate with the reflector assembly to adjust the optical path; the second aperture is used to limit the size of the light spot incident on the dual detection system;

[0013] The attenuation imaging-energy detection system is used to obtain the energy and imaging effect of the laser beam output by the second aperture.

[0014] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0015] The present application provides an experimental device capable of measuring the imaging quality and laser damage threshold of an optical system. Taking into account the two dimensions of optical system imaging quality and laser damage performance, an experimental device capable of measuring the point spread function and the laser damage threshold of an optical system is designed, and the effectiveness and reliability of the device are verified through experiments. The device can be used to switch between measuring the point spread function and adjusting the laser damage threshold by changing the attenuation degree. By changing the distance of the reflector, the point spread function and the laser damage threshold can be measured at different distances within a limited experimental site without requiring major changes to the optical path. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 Schematic diagram of the process of calculating PSF using the inclined edge method in one embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of obtaining the point spread function using the point pulse method in one embodiment of the present application;

[0019] Figure 3This is a schematic diagram of the optical path of the laser irradiating the CMOS photodetector in one embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the structure of an experimental device capable of measuring the imaging quality and laser damage threshold of an optical system in one embodiment of the present application;

[0021] Figure 5 Schematic diagram of the point spread function of a conventional imaging system in one embodiment of the present application;

[0022] Figure 6 Schematic diagram of the imaging effect and point spread function distribution of the wavefront coding system experiment in one embodiment of the present application;

[0023] Figure 7 Schematic diagram of the damage morphology of the optical system in one embodiment of the present application. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0026] Inclined Knife Edge Method: The way to obtain PSF under ideal inclination angle is to use ISO12233 Inclined Knife Edge Method to calculate PSF. This technology selects the part with inclined knife edge in the image and uses fitting, interpolation and differentiation techniques to determine the line spread function (LSF) of this part, and finally derives the point spread function of the entire system. The process of calculating PSF by knife edge method is as follows: Figure 1 As shown in the figure, the point spread function estimation process involves: obtaining an edge spread function curve based on the blade edge; derivatizing the edge spread function to obtain the line spread function; performing a Fourier transform on the line spread function to obtain a one-dimensional MTF, followed by vector operations to obtain a two-dimensional MTF; and performing an inverse Fourier transform to obtain the point spread function (PSF). This method is based on the simplifying assumption that the PSF follows a Gaussian distribution. In practical applications, the system's PSF is often much more complex than a Gaussian distribution, which limits the method's applicability and accuracy. This method also fails to account for the effects of noise. When imaging noise is high, it cannot accurately estimate the angle of the tilted blade edge, potentially leading to estimation failure.

[0027] Point Pulse Method: The point spread function (PSF) is the response of an optical system to a point light source. In an ideal optical system, the light energy emitted from a point on the object plane is also concentrated at a point on the image plane. However, in real optical systems, when imaging, the light emitted from a point on the object plane is always dispersed to a certain extent on the image plane. When the original image f(x,y) is a point pulse δ(x,y), the optical system imaging model can be written as: g(x,y) = δ(x,y) * h(x,y) + n(x,y) = h(x,y) + n(x,y); where h(x,y) represents the PSF of the optical system, g(x,y) is the image intensity distribution on the imaging plane, δ(x,y) is a point pulse representing an ideal point light source, n(x,y) represents the noise distribution of the imaging detector, and * represents the convolution operation. Therefore, when the original image is a point light source, the resulting blurred image is a PSF containing additive noise. By removing the additive noise, the PSF of the system can be obtained. This is the principle of measuring the PSF using the point pulse method. This method has a simple experimental principle and is easy to build. The schematic diagram of obtaining the point spread function of the point pulse method is as follows: Figure 2 The point pulse method is greatly affected by sensor noise. The presence of noise will interfere with the accurate acquisition of PSF, especially in the case of complex images or low signal-to-noise ratio, the estimation accuracy of the point spread function will be significantly reduced.

[0028] Damage threshold test system: The optical path system of the laser irradiation CMOS photodetector experimental device is as follows: Figure 3 As shown, the experimental system primarily consists of a light source module, a spectroscopic monitoring module, an irradiation control module, and a detection and analysis module. The experimental system uses a fiber laser with a wavelength of 1064 nm as the light source. The output laser is split into two paths by a beamsplitter: one path is attenuated by a neutral density filter before being precisely focused by a focusing lens onto the surface of a CMOS photodetector; the other path is directly directed to an energy meter probe for real-time monitoring of the incident laser energy. To precisely control irradiation conditions, the system is equipped with a three-dimensional translation stage for adjusting the spatial position of the detector. Combined with the rotation function of the bottom angle stage, this allows for continuous adjustment of the incident angle. Regarding the control system, a computer is connected to the CMOS detection unit and the laser source via dual channels, enabling real-time acquisition of device damage status and dynamic adjustment of key parameters such as laser energy and repetition rate. Furthermore, a motorized baffle is installed at the front of the beamsplitter, which, in conjunction with a high-precision timer, enables control of the irradiation time. Because this solution only performs damage testing on pure CMOS photodetectors, the lenses in the optical path serve only to precisely focus the light spot onto the CMOS photodetector surface and do not provide actual imaging capabilities. This results in serious aberrations in the measurement of the point spread function of the optical system and is unable to meet the requirements of laser damage threshold measurement under different distance conditions.

[0029] In view of the fact that the existing experimental device cannot simultaneously take into account the properties of measuring the imaging quality of the optical system and the laser damage threshold in two different dimensions, the present application, in an exemplary embodiment, Figure 4 As shown, an experimental device capable of measuring the imaging quality and laser damage threshold of an optical system is provided, comprising: a laser source, a first aperture, a reflector assembly, a second aperture, and an attenuation imaging-energy detection system arranged in sequence along an optical path; the laser source is used to emit a laser beam as a light source for the experiment; the first aperture is used to output the laser beam output by the laser source to the reflector assembly; the reflector assembly is used to reflect the laser beam output by the first aperture to the second aperture; the second aperture is used to output the laser beam output by the reflector assembly to the attenuation imaging-energy detection system. The detection system comprises a first aperture and a second aperture for collimating the optical path and limiting the size of the light spot entering the attenuation imaging-energy detection system. The first and second apertures cooperate with the reflector assembly to adjust the optical path. The second aperture limits the size of the light spot incident on the dual detection system. The coordinated configuration of the first and second apertures with the reflector assembly allows for optical path collimation during optical path adjustment. Adjusting the pitch angle of the reflectors changes the direction of the optical path, making it easier for the light path to enter the imaging lens perpendicularly, thus improving the convenience of optical path adjustment. The attenuation imaging-energy detection system is used to obtain the energy and imaging effect of the laser beam output by the second aperture. The reflector assembly includes multiple reflectors arranged along the optical path. The reflector assembly includes a first reflector and a second reflector. The first reflector reflects the laser beam output by the first aperture to the second reflector, and the second reflector reflects the laser beam output by the first reflector to the second aperture. The laser source emits a laser beam parallel to the ground. The angle between the first reflector and the laser beam emitted by the laser source is 45 degrees; the angle between the second reflector and the laser beam output by the first reflector is 45 degrees.

[0030] The attenuation imaging-energy detection system includes a beam splitter, an imaging optical path component, and an energy acquisition component. The beam splitter is used to split the laser beam output by the second aperture into a transmitted beam and a reflected beam. The imaging optical path component is used to receive the transmitted beam and obtain a damage threshold or imaging effect on the detector surface. The energy acquisition component is used to acquire the energy of the reflected beam. The imaging optical path component includes an attenuation plate, an imaging lens, and a CMOS sensor arranged along the optical path. The attenuation plate is used to attenuate the energy of the laser beam and output the attenuated laser beam to the imaging lens and CMOS sensor. The energy acquisition component includes a lens and an energy meter arranged along the optical path.

[0031] This application effectively expands the optical path adjustment dimension through the configuration of the aperture assembly and the reflector assembly, making it easier to adjust and collimate the optical path; by adjusting the positions of multiple reflectors in the reflector assembly, it is possible to measure the imaging performance and laser damage capability of different optical systems at different distances within a limited experimental site; by changing the number of attenuation plates, the measurement of the optical system point spread function and the test of laser damage performance can be switched.

[0032] This application provides an experimental device that can measure the imaging quality and laser damage threshold of an optical system, including a laser source, an attenuation plate, a reflector, an aperture, a beam splitter, a focusing lens, an energy meter and an imaging system. The experimental system consists of the following components: Figure 4 As shown. During the optical path adjustment process, the optical path collimation can be achieved through the coordinated action of the aperture assembly and the reflector assembly: the light beam path is calibrated with the help of the aperture, and the direction of the light path is changed by precisely adjusting the pitch angle of the reflector so that the light beam can be incident vertically on the imaging lens, thereby improving the efficiency and accuracy of the optical path adjustment. The point spread function and laser damage threshold test can be achieved by dynamically adjusting the attenuation of the attenuation plate: the incident laser energy is kept constant, and when the attenuation degree of the attenuation plate is increased, the point spread function of the optical system can be measured, and when the attenuation degree of the incident energy of the attenuation plate is reduced, the laser damage threshold of different optical systems can be measured. When you want to measure the point spread function under different distance conditions and explore the influence of distance on the laser damage capability of the optical system, you only need to adjust the distance between the two reflectors and the laser light source and the optical imaging system.

[0033] The process of setting up the optical path of the experimental device mainly includes three processes: laser alignment, reflector adjustment and camera alignment. Laser alignment: Using the double aperture positioning method, first adjust the two apertures to the same height as the laser source outlet, where the first aperture is about 5 cm close to the front end of the laser source, and the second aperture is arranged in parallel with an interval of 20 meters. By finely adjusting the pitch angle and horizontal direction of the laser source, the emitted light beam can accurately penetrate the central through-holes of the two apertures at the same time. At this time, the axis of the laser beam is completely parallel to the ground. Reflector adjustment: First, according to Figure 4According to the optical path design, place the reflector roughly in the specified position. Then adjust the reflectors in sequence according to the numbers. Taking reflector 1 as an example, it is necessary to ensure that the laser beam is irradiated on the center area of ​​the reflector, adjust its angle with the light beam to about 45 degrees, reflect the laser to the vicinity of reflector 2 and fix reflector 1. Then place a movable aperture on the reflected light path, adjust the pitch angle of reflector 1 so that the reflected beam is parallel to the ground, and use the fine-tuning function of the mirror frame to accurately align the laser with the center of reflector 2. Adjust the subsequent reflectors in the same way until the laser accurately returns to the vicinity of the camera to complete the optical path calibration. After the optical path calibration is completed, place the second aperture in front of the beam splitter to limit the size of the light spot entering the dual detection system. Camera alignment: Install the imaging lens on the camera, use the lens cover to cover the camera (to prevent damage to the camera), adjust the camera height and horizontal displacement so that the incident laser is in the center of the imaging lens. At this point, the optical path construction process is completed.

[0034] The experimental device can measure the point spread function of both conventional imaging systems and wavefront coded imaging systems. The measurement method is as follows:

[0035] The laser is reflected by a reflector and then passes through a beam splitter to reach the detector surface. As the transmission distance increases to a certain extent, the laser beam received by the detector is equivalent to a parallel beam incident, and the response reaching the detector surface is expressed as a point spread function. For conventional imaging system point spread function measurement method:

[0036] After adjusting the optical path, an attenuation plate should be added in front of the imaging lens to adjust the light intensity, thereby protecting the detector from damage caused by excessively strong laser light. At the same time, the driver is turned on and the histogram display of the image is monitored in real time. The energy of the incident laser can be precisely controlled by increasing or decreasing the number of attenuation plates to ensure that the pixels in the image are not oversaturated. In order to reduce the interference of stray light on the measurement results, the illumination source should be turned off to create a dark environment, and then the point spread function should be captured and saved. The point spread function of a conventional imaging system is as follows: Figure 5 The modulation transfer function obtained through Fourier transform processing can effectively describe the contrast transfer characteristics of the system at different spatial frequencies, highlighting its ability to resolve fine spatial details, and thus intuitively reflect the imaging quality of the optical system.

[0037] Point spread function measurement method for wavefront coded imaging system:

[0038] Adjust the optical path, add an attenuation plate in front of the imaging lens to increase the attenuation level to prevent the detector from being damaged, and at the same time turn on the driver to call out the image histogram. Control the incident laser energy by adjusting the number of attenuation plates to avoid saturation of pixels in the image. Turn off the lights to create a dark environment to avoid the influence of stray light on the point spread function measurement, and take a picture of the point spread function and save it. Add a phase plate in front of the conventional imaging system to form a wavefront coding imaging system, and measure the point spread function according to the conventional imaging system point spread function measurement method. The imaging effect and point spread function distribution of the wavefront coding system experiment are shown as follows: Figure 6 The intermediate coded object is photographed and saved, and a clear image is taken as a reference image without adding a phase plate. The decoded image is obtained by using the point spread function and Wiener filter decoding. The PSNR of the decoded image is 21.3977dB compared with the clear image. The experimental device provided by this application for measuring the imaging quality and laser damage threshold of the optical system is used to obtain the reference image and Figure 6 Before obtaining the encoded image in the image, the attenuation plate in the imaging optical path assembly must be removed.

[0039] The distribution of the point spread function (PSF) exhibits an L-shaped distribution consistent with the beam modulation shape of the cubic phase plate. Using the PSF captured in the experiment, Wiener filtering was used to decode the intermediate encoded image. The decoded image was clearer than the intermediate encoded image, with significantly reduced blur, better preservation of edge details, a high signal-to-noise ratio, and excellent restoration results. This demonstrates that this system can be used to obtain PSFs from various optical systems.

[0040] Experimental device for measuring laser damage threshold of imaging system:

[0041] The laser damage threshold of an imaging system refers to the maximum laser energy density or power density at which optical components (such as lenses, detectors, filters, etc.) in the imaging system will not suffer irreversible physical damage (such as melting, cracking, or permanent degradation of optical properties) under laser irradiation.

[0042] Laser damage threshold measurement method for conventional imaging systems:

[0043] First, the conventional imaging system focuses on the target to ensure that the optical system is in focus. After turning on the laser, the light beam is transmitted through the optical path to the beam splitter, where the reflected light is monitored in real time by the energy meter, and the transmitted light reaches the CMOS through the adjustable attenuator and imaging lens. The laser source is set to operate stably at a fixed pulse frequency, and a step-by-step energy loading strategy is adopted - starting from high attenuation, reducing the OD value by 0.1 each time. After the pulse energy stabilizes, the camera shield is removed and the detector is observed for damage. If damage occurs, the experimental data is recorded; if there is no damage, the attenuation is continued to be reduced until the detector is damaged.

[0044] Laser damage threshold measurement method for wavefront coded imaging system:

[0045] A wavefront-coded imaging system is constructed by adding a phase plate to a conventional imaging system. After the laser is turned on, the beam is transmitted through an optical path to a beamsplitter, where the reflected light is monitored in real time by an energy meter. The transmitted light passes through an adjustable attenuator and an imaging lens to the CMOS. The laser source is set to operate stably at a fixed pulse frequency, and a stepwise energy loading strategy is employed—starting with high attenuation and decreasing the energy by 0.1 OD at a time. Once the pulse energy stabilizes, the camera shield is removed and the detector is observed for damage. If damage is present, the experimental data is recorded. If no damage is present, the attenuation is further reduced until the detector is damaged.

[0046] The morphology of optical system damage is as follows: Figure 7 As shown, the red box is an enlarged picture. Figure 7 In the figure, number 1 is the point damage morphology of the conventional imaging system, and number 2 is the point damage morphology of the wavefront coding imaging system. If the reading of the energy meter is E, the beam splitting ratio of the reflection and transmission of the beam splitter is R:T, the attenuation value of the attenuator is OD, and the spot size is r, the laser energy density E reaching the lens surface can be calculated. d for: When testing a conventional imaging system, the energy meter reading is 35.12μJ, the OD value is 2.8, the beam splitter ratio is 45%:55%, and the spot diameter is 22mm. The damage threshold of the conventional imaging system is 0.0179μJ / cm 2 When testing the wavefront coded imaging system, the energy meter reading was 36.4μJ, the OD value was 1.8, the beam splitter ratio was 45%:55%, and the spot diameter was 22mm. The damage threshold of the conventional imaging system was tested to be 0.1856μJ / cm 2 , verifying that the system can perform laser damage performance testing of optical systems.

[0047] In the present application, the camera parameters can be changed, such as the main lens size, focal length, etc.; since the liquid crystal spatial light modulator has the characteristic of flexibly generating different phase modulation functions, the phase plate can also be replaced by a liquid crystal spatial light modulator, and its principle is the same as that of the embodiment; the wavefront coded image reconstruction algorithm in the present application is not limited to the Wiener filtering described in the embodiment, but also includes algorithms such as: inverse filtering, improved Wiener filtering, Lucy-Richardson filtering, wavelet analysis and other deep learning-related deblurring algorithms.

[0048] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. An experimental device capable of measuring the imaging quality and laser damage threshold of an optical system, characterized in that: include: A laser source, a first aperture, a reflector assembly, a second aperture and an attenuation imaging-energy detection system are sequentially arranged along the optical path; The laser source is used to emit a laser beam as a light source for the experiment; The first aperture is used to output the laser beam output by the laser source to the reflector assembly; The reflector assembly is used to reflect the laser beam output by the first aperture to the second aperture; The second aperture is used to output the laser beam output by the reflector assembly to the attenuation imaging-energy detection system; The first aperture and the second aperture are used to collimate the optical path and limit the size of the light spot entering the attenuation imaging-energy detection system; the first aperture and the second aperture cooperate with the reflector assembly to adjust the optical path; the second aperture is used to limit the size of the light spot incident on the dual detection system; The attenuation imaging-energy detection system is used to obtain the energy and imaging effect of the laser beam output by the second aperture.

2. The experimental device capable of measuring the imaging quality and laser damage threshold of an optical system according to claim 1, characterized in that: The reflector assembly includes: a plurality of reflectors arranged along the light path.

3. The experimental device capable of measuring the imaging quality and laser damage threshold of an optical system according to claim 2, characterized in that: The reflector assembly includes: a first reflector and a second reflector; The first reflecting mirror is used to reflect the laser beam output by the first aperture to the second reflecting mirror; The second reflecting mirror is used to reflect the laser beam output by the first reflecting mirror to the second aperture.

4. The experimental device capable of measuring the imaging quality and laser damage threshold of an optical system according to claim 1, characterized in that: The laser source emits a laser beam parallel to the ground.

5. The experimental device capable of measuring the imaging quality and laser damage threshold of an optical system according to claim 2, characterized in that: The angle between the first reflector and the laser beam emitted by the laser source is 45 degrees; The included angle between the laser beam output by the second reflector and the first reflector is 45 degrees.

6. The experimental device capable of measuring the imaging quality and laser damage threshold of an optical system according to claim 1, characterized in that: The attenuation imaging-energy detection system includes: a beam splitter, an imaging optical path component and an energy acquisition component; The beam splitter is used to split the laser beam output by the second aperture into a transmitted beam and a reflected beam; The imaging optical path component is used to receive the transmitted light beam and obtain a damage threshold or imaging effect on the detector surface; The energy acquisition component is used to acquire the energy of the reflected light beam.

7. The experimental device capable of measuring the imaging quality and laser damage threshold of an optical system according to claim 6, characterized in that: The imaging optical path assembly includes: an attenuation plate, an imaging lens and a CMOS sensor arranged along the optical path; The attenuation plate is used to attenuate the energy of the laser beam and output the laser beam after energy attenuation to the imaging lens and the CMOS sensor.

8. The experimental device capable of measuring the imaging quality and laser damage threshold of an optical system according to claim 6, characterized in that: The energy acquisition component includes: a lens and an energy meter arranged along the light path.

9. The experimental device capable of measuring the imaging quality and laser damage threshold of an optical system according to claim 2, characterized in that: The experimental device capable of measuring the imaging quality and laser damage threshold of an optical system can measure the imaging performance and laser damage capability of different optical systems at different distances within a limited experimental site by adjusting the positions of multiple reflectors in the reflector assembly.

10. The experimental device capable of measuring the imaging quality and laser damage threshold of an optical system according to claim 1, characterized in that: The experimental device capable of measuring the imaging quality and laser damage threshold of an optical system switches between the measurement of the optical system point spread function and the test of the laser damage performance by changing the number of attenuation sheets.

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