Compact wide-spectrum large-dynamic laser beam measuring system
By designing a compact, wide-spectrum, high-dynamic-range laser beam measurement system, the problem that existing devices can only measure single wavelengths has been solved, enabling the measurement of multi-wavelength laser beams. The system is miniaturized and maintains high-quality measurement performance over a wide temperature range.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-03-13
AI Technical Summary
Existing laser beam measurement devices can only perform achromatic measurement on multiple single wavelengths and cannot measure laser beams of other wavelengths, resulting in poor versatility. Furthermore, most of these devices are large, heavy, and have poor adaptability to environmental temperatures.
A compact, wide-spectrum, high-dynamic-range laser beam measurement system is employed, comprising a primary beam shortener, an optical axis measuring mirror group, a secondary beam shortener, a first beam splitter, a second beam splitter, a sixth folding axis mirror, and a seventh folding axis mirror, forming a wavefront, pupil, and optical axis measurement system capable of measuring laser beams across the entire wavelength range.
It achieves universal measurement of broadband laser beams, miniaturizes and lightens the system, and maintains good environmental adaptability over a wide temperature dynamic range, enabling high-quality beam measurement within a temperature range of -10℃ to 50℃.
Smart Images
Figure CN121655682A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to imaging optical systems, and more specifically to a compact, wide-spectrum, high-dynamic-range laser beam measurement system. Background Technology
[0002] The effect of a laser beam on a target depends not only on the laser's output power and duration, but also closely on the beam quality and direction within that duration. Wavefront and near-field spot measurement is primarily used to obtain parameters such as the intensity distribution and spot size of the laser beam in the near-field region. The measurement employs a direct imaging method, using a beam shortener to image the near-field spot of the laser beam onto a detector, which directly records the intensity distribution image. Laser optical axis measurement is a key technology for evaluating the stability of the output beam direction of a laser system under environmental factors such as temperature changes, vibration, and mechanical stress, and is widely used in laser processing, communications, and other fields.
[0003] Currently, laser beam measurement devices only perform achromatic aberration measurement on multiple single wavelengths and cannot measure laser beams outside these wavelengths, resulting in poor versatility. Furthermore, most laser beam measurement devices are used in laboratory environments, generally resulting in large size and weight, and poor adaptability to the environmental temperature of large-scale outdoor testing. Summary of the Invention
[0004] The purpose of this invention is to solve the problem that current laser beam measurement devices can only perform achromatic aberration on multiple single wavelengths and cannot measure laser beams outside the wavelength, resulting in poor versatility. In this invention, a compact, wide-spectrum, high dynamic range laser beam measurement system is provided.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: A compact broadband high dynamic range laser beam measurement system is characterized by comprising a first-stage beam shrinker, an optical axis measuring mirror group, a second-stage beam shrinker, a first beam splitter, a second beam splitter, a sixth folding axis mirror, and a seventh folding axis mirror. The first-stage beam reducer, the reflecting surface of the first beam splitter, and the transmitting surface of the second beam splitter are sequentially arranged in the optical path where the laser beam is located to form a wavefront measurement system. A wavefront measurement camera is provided at the output end of the transmitting surface of the second beam splitter. The primary beam reducer, the reflecting surface of the first beam splitter, the reflecting surface of the second beam splitter, the seventh folding mirror, and the secondary beam reducer are sequentially arranged in the optical path where the laser beam is located to form a pupil measurement system. A pupil measurement camera is provided at the output end of the secondary beam reducer. The first-stage beam reducer, the transmission surface of the first beam splitter, the optical axis measuring mirror group, and the sixth folding axis mirror are sequentially arranged in the optical path where the laser beam is located to form an optical axis measuring system. An optical axis measuring camera is provided at the output end of the sixth folding axis mirror.
[0006] Furthermore, the primary beam shrinker includes an objective lens group, a fourth folding mirror, a fifth folding mirror, and an eyepiece lens group, which are sequentially arranged in the optical path where the laser beam is located.
[0007] Furthermore, the objective lens assembly includes a first biconvex lens, a first meniscus lens, a second meniscus lens, a first folding mirror, a second folding mirror, and a third folding mirror, which are sequentially arranged in the optical path where the laser beam is located.
[0008] Furthermore, the first biconvex lens has an incident surface radius of curvature of 588.155 mm, an exit surface radius of curvature of -134.464 mm, a thickness of 18.884 mm, a refractive index of 1.6, an Abbe number of 56.7, and a distance of 1.717 mm between its incident surface and that of the first meniscus lens. The first meniscus lens has an incident surface radius of curvature of -130.144 mm, an exit surface radius of curvature of -215.174 mm, a thickness of 15.451 mm, a refractive index of 1.5, an Abbe number of 64.8, and a distance of 1.717 mm between its incident surface and that of the second meniscus lens. The second meniscus lens has an incident surface radius of curvature of -200.563 mm, an exit surface radius of curvature of -4837.609 mm, a thickness of 15.451 mm, a refractive index of 1.7, an Abbe number of 39.5, and is 260 mm away from the incident surface of the first folding lens.
[0009] Furthermore, the eyepiece assembly includes a third meniscus lens, a fourth meniscus lens, a first biconcave lens, and a second biconvex lens, which are sequentially arranged in the optical path of the beam emitted from the fifth folding mirror.
[0010] Furthermore, the third meniscus lens has an incident surface radius of curvature of 146.333 mm, an exit surface radius of curvature of 29.846 mm, a thickness of 4.292 mm, a refractive index of 1.5, an Abbe number of 64.2, and an incident surface distance of 8.183 mm from the fourth meniscus lens. The fourth meniscus lens has an incident surface curvature radius of 15.499 mm, an exit surface curvature radius of 16.743 mm, a thickness of 3.433 mm, a refractive index of 1.9, an Abbe number of 23.8, and an incident surface distance of 2.447 mm from the first biconcave lens. The first biconcave lens has an incident surface radius of curvature of 16.383 mm, an exit surface radius of curvature of -27.989 mm, a thickness of 3.004 mm, a refractive index of 1.5, an Abbe number of 60.2, and a distance of 1.467 mm between its incident surface and that of the second biconvex lens. The second biconvex lens has an incident surface curvature radius of -32.188 mm, an exit surface curvature radius of 18.024 mm, a thickness of 5.150 mm, a refractive index of 1.4, an Abbe number of 94.5, and a distance of 110.729 mm between its incident surface and that of the first beam splitter.
[0011] Furthermore, the secondary beam shrinker includes a fifth meniscus lens, a second biconcave lens, a third biconvex lens, a sixth meniscus lens, a seventh meniscus lens, and a fourth biconvex lens, which are sequentially arranged in the optical path of the beam emitted from the seventh folding mirror.
[0012] Furthermore, the fifth meniscus lens has an incident surface curvature radius of -902.032 mm, an exit surface curvature radius of -41.581 mm, a thickness of 4 mm, a refractive index of 1.6, an Abbe number of 61.2, and an incident surface distance of 2.001 mm from the second biconcave lens. The second biconcave lens has an incident surface radius of curvature of -45.576 mm, an exit surface radius of curvature of 29.516 mm, a thickness of 3 mm, a refractive index of 1.7, an Abbe number of 39.5, and an incident surface distance of 1.905 mm from the third biconvex lens. The third biconvex lens has an incident surface radius of curvature of 34.171 mm, an exit surface radius of curvature of -114.920 mm, a thickness of 4 mm, a refractive index of 1.7, an Abbe number of 44.9, and an incident surface distance of 171.476 mm from the sixth meniscus lens. The sixth meniscus lens has an incident surface curvature radius of -12.472 mm, an exit surface curvature radius of -12.451 mm, a thickness of 3 mm, a refractive index of 1.8, an Abbe number of 35.0, and a distance of 5.004 mm between its incident surface and that of the seventh meniscus lens. The seventh meniscus lens has an incident surface curvature radius of 66.129 mm, an exit surface curvature radius of 12.867 mm, a thickness of 2 mm, a refractive index of 1.7, an Abbe number of 39.5, and an incident surface distance of 5.004 mm from the fourth biconvex lens. The fourth biconvex lens has an incident surface radius of curvature of 25.467 mm, an exit surface radius of curvature of -11.098 mm, a thickness of 3.5 mm, a refractive index of 1.4, an Abbe number of 94.5, and a distance of 43.863 mm between its incident surface and that of the pupil measuring camera.
[0013] Furthermore, the optical axis measuring mirror assembly includes a fifth biconvex lens and an eighth meniscus lens, which are sequentially arranged on the optical path of the transmitted beam of the first beam splitter.
[0014] Furthermore, the fifth biconvex lens has an incident surface curvature radius of -217.060 mm, an exit surface curvature radius of 53.730 mm, a thickness of 6.250 mm, a refractive index of 1.6, an Abbe number of 53.9, and an incident surface distance of 2.5 mm from the eighth meniscus lens. The eighth crescent lens has an incident surface curvature radius of 51.087 mm, an exit surface curvature radius of 463.588 mm, a thickness of 5 mm, a refractive index of 1.7, an Abbe number of 59.5, and an incident surface distance of 30 mm from the sixth folding lens.
[0015] The beneficial effects of this invention are: 1. This invention provides a compact wide-spectrum large dynamic range laser beam measurement system, which adopts a two-layer structure including a pupil measurement system and an optical axis measurement system. The image quality of the pupil measurement system, the optical axis measurement system and the combined system all meet the design requirements, reducing the assembly difficulty of integrating each subsystem.
[0016] 2. This invention provides a compact, wide-spectrum, high-dynamic-range laser beam measurement system that can be used for wide-spectrum achromatic measurement and can measure laser beams across the entire wavelength range. It has strong versatility in laser beam measurement.
[0017] 3. This invention provides a compact, wide-spectrum, high-dynamic-range laser beam measurement system with a heat-free design over a large temperature dynamic range, strong environmental adaptability, and is not limited by the experimental environment.
[0018] 4. This invention provides a compact, wide-spectrum, large dynamic range laser beam measurement system that can achieve the functional requirements of miniaturization, lightweight design, near-field spot measurement, and wavelet aberration measurement. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the upper structure of an embodiment of the compact broadband large dynamic range laser beam measurement system of the present invention; Figure 2 This is a schematic diagram of the lower structure of an embodiment of the compact broadband large dynamic range laser beam measurement system of the present invention; Figure 3 This is a point plot of the wavefront measurement system at a temperature of -10℃ in an embodiment of a compact broadband large dynamic range laser beam measurement system of the present invention; Figure 4 This is a point plot of the wavefront measurement system at a temperature of 20°C in an embodiment of a compact broadband large dynamic range laser beam measurement system of the present invention. Figure 5 This is a point plot of the wavefront measurement system at 50°C in an embodiment of a compact broadband large dynamic range laser beam measurement system of the present invention. Figure 6This is a dot plot of the pupil measurement system at a temperature of -10℃ in an embodiment of a compact broadband large dynamic range laser beam measurement system of the present invention; Figure 7 This is a dot plot of the pupil measurement system at a temperature of 20°C in an embodiment of a compact broadband large dynamic range laser beam measurement system of the present invention; Figure 8 This is a dot plot of the pupil measurement system at 50°C in an embodiment of a compact broadband large dynamic range laser beam measurement system of the present invention; Figure 9 This is a point diagram of the optical axis measurement system at a temperature of -10℃ in an embodiment of a compact broadband large dynamic range laser beam measurement system of the present invention; Figure 10 This is a point diagram of the optical axis measurement system at a temperature of 20°C in an embodiment of a compact broadband large dynamic range laser beam measurement system of the present invention. Figure 11 This is a point diagram of the optical axis measurement system at a temperature of 50°C in an embodiment of a compact broadband large dynamic range laser beam measurement system of the present invention.
[0020] The attached figures are labeled as follows: 1-Objective lens group, 2-Eyepiece lens group, 3-Optical axis measuring lens group, 4-Secondary beam shortener, 5-First beam splitter, 6-Second beam splitter, 7-Fourth folding axis lens, 8-Fifth folding axis lens, 9-Sixth folding axis lens, 10-Seventh folding axis lens, 11-First biconvex lens, 12-First meniscus lens, 13-Second meniscus lens, 14-First folding axis lens, 15-Second folding axis lens, 16-Third folding axis lens, 17-Third meniscus lens, 18-Fourth meniscus lens, 19-First biconcave lens, 20-Second biconvex lens, 21-Fifth meniscus lens, 22-Second biconcave lens, 23-Third biconvex lens, 24-Sixth meniscus lens, 25-Seventh meniscus lens, 26-Fourth biconvex lens, 27-Fifth biconvex lens, 28-Eighth meniscus lens. Detailed Implementation
[0021] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] An embodiment of the present invention discloses a compact broadband large dynamic range laser beam measurement system, comprising an upper structure and a lower structure, wherein the upper structure is as follows: Figure 1 The diagram shows objective lens group 1, fourth folding axis lens 7, and the lower structure as follows: Figure 2As shown, it includes eyepiece group 2, optical axis measuring lens group 3, secondary beam shortener 4, first beam splitter 5, second beam splitter 6, fifth folding axis mirror 8, sixth folding axis mirror 9, and seventh folding axis mirror 10.
[0023] Among them, the objective lens group 1, the fourth folding mirror 7, the fifth folding mirror 8, and the eyepiece lens group 2 are sequentially arranged in the optical path where the laser beam is located to form a first-stage beam shrinker.
[0024] A wavefront measurement system is formed by sequentially arranging a primary beam reducer, the reflecting surface of the first beam splitter 5, and the transmitting surface of the second beam splitter 6 along the optical path of the laser beam. A wavefront measurement camera is installed at the output end of the transmitting surface of the second beam splitter 6 to measure the shape of the light wavefront.
[0025] Objective lens group 1, fourth folding mirror 7, fifth folding mirror 8, eyepiece lens group 2, the reflecting surface of first beam splitter 5, the reflecting surface of second beam splitter 6, seventh folding mirror 10, and second-stage beam shortener 4 are sequentially arranged in the optical path where the laser beam is located to form a pupil measurement system. A pupil measurement camera is set at the output end of the second-stage beam shortener 4. The pupil measurement system's imaging information is collected by the pupil measurement camera to perform pupil measurement.
[0026] Objective lens group 1, fourth folding mirror 7, fifth folding mirror 8, eyepiece lens group 2, the transmission surface of the first beam splitter 5, optical axis measuring mirror group 3, and sixth folding mirror 9 are sequentially arranged in the optical path where the laser beam is located to form an optical axis measuring system. An optical axis measuring camera is set at the output end of the sixth folding mirror 9. The optical axis is measured by collecting the imaging information of the optical axis measuring system through the optical axis measuring camera.
[0027] The laser beam under test passes through a first-stage beamsplitter and then through a first beam splitter 5 to obtain a transmitted beam and a reflected beam. The reflected beam passes through the reflecting surface of a second beam splitter 6, a seventh folded-axis mirror 10, and a second-stage beamsplitter 4 for pupil measurement. The transmitted beam passes through an optical axis measuring mirror group 3 and a sixth folded-axis mirror 9 for optical axis measurement. The pupil measurement system and the optical axis measurement system share the first-stage beamsplitter and the first beam splitter 5, allowing for a compact overall beam measurement system and facilitating system miniaturization.
[0028] like Figure 2 As shown, the objective lens group 1 includes a first biconvex lens 11, a first meniscus lens 12, a second meniscus lens 13, a first folding mirror 14, a second folding mirror 15, and a third folding mirror 16, which are sequentially arranged in the optical path where the laser beam is located.
[0029] The eyepiece assembly 2 includes a third meniscus lens 17, a fourth meniscus lens 18, a first biconcave lens 19, and a second biconvex lens 20, which are sequentially arranged in the optical path of the beam emitted from the fifth folding mirror 8.
[0030] The optical axis measuring mirror group 3 includes a fifth biconvex lens 27 and an eighth meniscus lens 28, which are sequentially arranged on the optical path of the transmitted beam of the first beam splitter 5.
[0031] The secondary beam shrinker 4 includes a fifth meniscus lens 21, a second biconcave lens 22, a third biconvex lens 23, a sixth meniscus lens 24, a seventh meniscus lens 25, and a fourth biconvex lens 26, which are sequentially arranged in the optical path of the beam emitted from the seventh folding mirror 10.
[0032] This embodiment employs the aforementioned compact, wide-spectrum, high-dynamic-range laser beam measurement system. The design wavelength is 480nm~1100nm, the magnification of the first-stage and second-stage beam shorteners are 6× and 5× respectively, the focal length of the optical axis measurement mirror group is 300mm, and the operating temperature range is -10℃~50℃. The curvature radius, spacing, thickness, refractive index, and Abbe number of each component are shown in Table 1. Table 1 In Table 1, the lens reference labels correspond to the components. The radius of curvature in the first row of each lens reference label is the radius of curvature of the incident surface, the radius of curvature in the second row is the radius of curvature of the exit surface, and the interval is the distance between the next lens.
[0033] For a compact broadband large dynamic range laser beam measurement system formed by the parameters in Table 1, the point plots of the wavefront measurement system at temperatures of -10℃, 20℃, and 50℃ are as follows. Figures 3-5 As shown in the dot plot, it can be seen that within the temperature range of -10℃ to 50℃, the diffuse spots of the wavefront measurement system are all within the diffraction limit, thus the parallelism of the emitted light rays from the wavefront measurement system is very good.
[0034] The dot plots of the pupil measurement system at temperatures of -10℃, 20℃, and 50℃ are shown below. Figures 6-8 As shown in the dot plot, it can be seen that within the temperature range of -10℃ to 50℃, the diffusion spots of the pupil measurement system are all within the diffraction limit, thus the parallelism of the emitted light rays from the pupil measurement system is very good.
[0035] Point plots of the optical axis measurement system at temperatures of -10℃, 20℃, and 50℃ are shown below. Figures 9-11 As shown in the dot plot, it can be seen that within the temperature range of -10℃ to 50℃, the diffuse spots of the optical axis measurement system are all within the diffraction limit, thus the optical axis measurement system has good imaging quality.
[0036] In summary, the compact wide-spectrum large dynamic range laser beam measurement system of this embodiment exhibits good environmental adaptability within a temperature range of -10℃ to 50℃ when performing wavefront measurement, pupil measurement, and optical axis measurement.
[0037] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A compact broadband large dynamic range laser beam measurement system, characterized in that: It includes a first-stage beam shrinker, an optical axis measuring mirror group (3), a second-stage beam shrinker (4), a first beam splitter (5), a second beam splitter (6), a sixth folding axis mirror (9), and a seventh folding axis mirror (10); The first beam reducer, the reflecting surface of the first beam splitter (5), and the transmitting surface of the second beam splitter (6) are sequentially arranged on the optical path where the laser beam is located to form a wavefront measurement system. A wavefront measurement camera is provided at the output end of the transmitting surface of the second beam splitter (6). The primary beam reducer, the reflecting surface of the first beam splitter (5), the reflecting surface of the second beam splitter (6), the seventh folding mirror (10), and the secondary beam reducer (4) are sequentially arranged on the optical path where the laser beam is located to form a pupil measurement system. A pupil measurement camera is provided at the output end of the secondary beam reducer (4). The first beam reducer, the transmission surface of the first beam splitter (5), the optical axis measuring mirror group (3), and the sixth folding mirror (9) are sequentially arranged on the optical path where the laser beam is located to form an optical axis measuring system. An optical axis measuring camera is provided at the output end of the sixth folding mirror (9).
2. The compact broadband large dynamic range laser beam measurement system according to claim 1, characterized in that: The primary beam shrinker includes an objective lens group (1), a fourth folding mirror (7), a fifth folding mirror (8), and an eyepiece lens group (2), which are sequentially arranged on the optical path where the laser beam is located.
3. The compact broadband large dynamic range laser beam measurement system according to claim 2, characterized in that: The objective lens group (1) includes a first biconvex lens (11), a first meniscus lens (12), a second meniscus lens (13), a first folding mirror (14), a second folding mirror (15), and a third folding mirror (16) arranged sequentially on the optical path where the laser beam is located.
4. The compact broadband large dynamic range laser beam measurement system according to claim 3, characterized in that: The first biconvex lens (11) has an incident surface radius of curvature of 588.155 mm, an exit surface radius of curvature of -134.464 mm, a thickness of 18.884 mm, a refractive index of 1.6, an Abbe number of 56.7, and a distance of 1.717 mm between its incident surface and that of the first meniscus lens (12). The first meniscus lens (12) has an incident surface curvature radius of -130.144 mm, an exit surface curvature radius of -215.174 mm, a thickness of 15.451 mm, a refractive index of 1.5, an Abbe number of 64.8, and an incident surface distance of 1.717 mm from the second meniscus lens (13). The second meniscus lens (13) has an incident surface curvature radius of -200.563 mm, an exit surface curvature radius of -4837.609, a thickness of 15.451 mm, a refractive index of 1.7, an Abbe number of 39.5, and an incident surface distance of 260 mm from the first folding mirror (14).
5. A compact broadband large dynamic range laser beam measurement system according to claim 2, characterized in that: The eyepiece assembly (2) includes a third meniscus lens (17), a fourth meniscus lens (18), a first biconcave lens (19), and a second biconvex lens (20), which are sequentially arranged on the optical path of the beam emitted from the fifth folding mirror (8).
6. The compact broadband large dynamic range laser beam measurement system according to claim 5, characterized in that: The third meniscus lens (17) has an incident surface curvature radius of 146.333 mm, an exit surface curvature radius of 29.846 mm, a thickness of 4.292 mm, a refractive index of 1.5, an Abbe number of 64.2, and an incident surface distance of 8.183 mm from the fourth meniscus lens (18). The fourth meniscus lens (18) has an incident surface curvature radius of 15.499 mm, an exit surface curvature radius of 16.743 mm, a thickness of 3.433 mm, a refractive index of 1.9, an Abbe number of 23.8, and an incident surface distance of 2.447 mm from the first biconcave lens (19). The first biconcave lens (19) has an incident surface curvature radius of 16.383 mm, an exit surface curvature radius of 27.989 mm, a thickness of 3.004 mm, a refractive index of 1.5, an Abbe number of 60.2, and an incident surface distance of 1.467 mm from the second biconvex lens (20). The second biconvex lens (20) has an incident surface curvature radius of -32.188 mm, an exit surface curvature radius of 18.024 mm, a thickness of 5.150 mm, a refractive index of 1.4, an Abbe number of 94.5, and an incident surface distance of 110.729 mm from the first beam splitter (5).
7. The compact broadband large dynamic range laser beam measurement system according to claim 1, characterized in that: The secondary beam shrinker (4) includes a fifth meniscus lens (21), a second biconcave lens (22), a third biconvex lens (23), a sixth meniscus lens (24), a seventh meniscus lens (25), and a fourth biconvex lens (26) arranged sequentially on the optical path of the beam emitted from the seventh folding mirror (10).
8. A compact broadband large dynamic range laser beam measurement system according to claim 7, characterized in that: The fifth meniscus lens (21) has an incident surface curvature radius of -902.032 mm, an exit surface curvature radius of -41.581 mm, a thickness of 4 mm, a refractive index of 1.6, an Abbe number of 61.2, and an incident surface distance of 2.001 mm from the second biconcave lens (22). The second biconcave lens (22) has an incident surface curvature radius of -45.576 mm, an exit surface curvature radius of 29.516 mm, a thickness of 3 mm, a refractive index of 1.7, an Abbe number of 39.5, and an incident surface distance of 1.905 mm from the third biconvex lens (23). The third biconvex lens (23) has an incident surface curvature radius of 34.171 mm, an exit surface curvature radius of -114.920 mm, a thickness of 4 mm, a refractive index of 1.7, an Abbe number of 44.9, and an incident surface distance of 171.476 mm from the sixth meniscus lens (24). The sixth crescent lens (24) has an incident surface curvature radius of -12.472 mm, an exit surface curvature radius of -12.451 mm, a thickness of 3 mm, a refractive index of 1.8, an Abbe number of 35.0, and an incident surface distance of 5.004 mm from the seventh crescent lens (25). The seventh meniscus lens (25) has an incident surface curvature radius of 66.129 mm, an exit surface curvature radius of 12.867 mm, a thickness of 2 mm, a refractive index of 1.7, an Abbe number of 39.5, and an incident surface distance of 5.004 mm from the fourth biconvex lens (26). The fourth biconvex lens (26) has an incident surface curvature radius of 25.467 mm, an exit surface curvature radius of -11.098 mm, a thickness of 3.5 mm, a refractive index of 1.4, an Abbe number of 94.5, and a distance of 43.863 mm between its incident surface and that of the pupil measuring camera.
9. A compact broadband large dynamic range laser beam measurement system according to claim 1, characterized in that: The optical axis measuring mirror group (3) includes a fifth biconvex lens (27) and an eighth meniscus lens (28) arranged sequentially on the optical path of the transmitted beam of the first beam splitter (5).
10. A compact broadband large dynamic range laser beam measurement system according to claim 9, characterized in that: The fifth biconvex lens (27) has an incident surface curvature radius of 217.060 mm, an exit surface curvature radius of -53.730 mm, a thickness of 6.250 mm, a refractive index of 1.6, an Abbe number of 53.9, and an incident surface distance of 2.5 mm from the eighth meniscus lens (28). The eighth crescent lens (28) has an incident surface curvature radius of 51.087 mm, an exit surface curvature radius of 463.588 mm, a thickness of 5 mm, a refractive index of 1.7, an Abbe number of 59.5, and an incident surface distance of 30 mm from the sixth folded-axis lens (9).