A laser light source device for large aperture beam parameter measurement

Abstract

The utility model relates to a kind of laser light sources, specifically to a kind of laser light source device for large aperture beam parameter measurement, its purpose is to solve the uniformity of laser generated by the device of the prior art collimating and expanding laser light source, collimation is low, and the degree of integration of device is low, it is prone to influence the problem of large aperture laser measurement experimental result;The utility model includes box body, and optical fiber laser, collimating mirror group and beam expander mirror group are coaxially arranged in the inside of box body in order along light ray exit direction;The collimating mirror group is used to convert the laser emitted by optical fiber laser into collimating beam;The beam expander mirror group includes ocular group and beam expander objective group coaxially arranged in order along light ray exit direction, respectively for focusing and twice collimating of incident collimating beam, so that it reaches preset aperture, and emits to outside through the light outlet opened on box body.

Description

Technical Field

[0001] This utility model relates to a laser source, specifically to a laser source device for measuring the parameters of a large-aperture beam. Background Technology

[0002] With the rapid development of technology, lasers, due to their strong coherence, small divergence angle, and concentrated energy, are increasingly widely used in scientific research and optical measurement. Furthermore, as the application scenarios and objects of laser sources expand, the demand for large-aperture laser beams in measurement experiments is increasing, and the parameter requirements are becoming more stringent. To obtain a large-aperture laser beam that meets the needs of measurement experiments, it is usually necessary to collimate and expand the laser beam emitted from the laser. While expanding the diameter of the laser beam, it is also necessary to ensure that the collimation effect is not compromised, thereby simultaneously achieving the goal of expanding the laser beam diameter and optimizing the laser beam divergence angle.

[0003] Currently, laser collimation and beam expansion methods are mainly divided into two categories. One category involves adding multiple lenses or lens groups to the optical system for collimation and beam expansion. For example, Chinese patent CN103633557A proposes a collimation and beam expansion device for a laser radar semiconductor laser source, which uses a three-lens collimation and beam expansion device to optimize the divergence angle and improve the stability of the laser beam. However, when this method is applied in large-aperture laser measurement experiments, it makes the optical system structure more complex and greatly increases the difficulty of aberration correction. At the same time, considering the diffraction effect of optical elements, the requirements for lens design and manufacturing process are very high, and the manufacturing cost increases significantly. The other category of methods, based on this, integrates the laser source with the collimating lens and beam expander. For example, Chinese patent CN209374880U proposes a laser source module, which directly integrates the laser source with the collimating lens and beam expander into a single structure through a mounting cylinder, thereby avoiding the influence of adding lenses to the optical system on the experimental results. However, this device is only suitable for optical systems with smaller apertures. For large-aperture laser measurement experiments, simply increasing the size of the device cannot achieve the required measurement accuracy standards. Utility Model Content

[0004] The main purpose of this invention is to solve the problems of low uniformity and collimation of laser light generated by existing devices for collimating and expanding laser light sources, as well as low integration of the devices, which easily affect the experimental results of large-aperture laser measurement. The invention provides a laser light source device for measuring the parameters of large-aperture laser beams.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A laser source device for measuring the parameters of a large-aperture beam includes a fiber laser, and a collimating lens group and a beam expander group arranged coaxially in sequence on the output optical path of the fiber laser; its special feature is that:

[0007] It also includes the enclosure;

[0008] The side wall of the enclosure is provided with a light outlet;

[0009] The fiber laser, collimating lens group, and beam expander group are all fixedly installed inside the enclosure;

[0010] The fiber laser body is fixedly connected to the housing, and its output end is coaxially fixedly connected to the input end of the collimating lens group, for emitting an initial laser beam to the collimating lens group.

[0011] The collimating lens group is used to collimate the initial laser beam once to form a collimated beam.

[0012] The beam expander assembly includes an eyepiece assembly and a beam expander objective assembly arranged coaxially along the direction of the collimated beam emission. The image-side focal point of the eyepiece assembly coincides with the object-side focal point of the beam expander objective assembly. The incident end of the eyepiece assembly corresponds to the exit end of the collimating lens assembly and is used to initially focus the collimated beam to form a focused beam. The exit end of the beam expander objective assembly corresponds to the light outlet and is used to perform secondary collimation and beam expansion on the focused beam to achieve a preset aperture.

[0013] Furthermore, the collimating lens assembly includes a collimating lens one and a collimating lens two, which are sequentially arranged inside the collimating lens tube along the initial laser beam emission direction;

[0014] The collimating lens tube is a stepped tube, comprising a first stepped segment, a second stepped segment, and a third stepped segment connected coaxially in ascending order of inner diameter; a first stepped surface is formed between the first stepped segment and the second stepped segment; a second stepped surface is formed between the second stepped segment and the third stepped segment; a light-transmitting aperture for initial laser beam incidence is provided at the end of the first stepped segment away from the second stepped segment; the emitting end of the fiber laser is connected to the light-transmitting aperture;

[0015] The collimating lens is installed in the second step section via the centering frame.

[0016] The collimating lens two is installed in the second step section via the centering frame two;

[0017] A trimming washer is provided between the centering frame and the first step surface;

[0018] A spacer ring is provided between the first and second collimating frames to ensure that the air gap between the first and second collimating lenses is the same as the theoretical design, thus ensuring the imaging quality of the collimating lens group.

[0019] The third step section is provided with an outer pressure ring 1, which is used to axially press the centering frame 2.

[0020] Furthermore, the emitting end of the fiber laser is installed at the light-transmitting hole of the first step section through a fiber optic sleeve bracket;

[0021] A flange trimming gasket is provided between the fiber optic sleeve support and the first step section.

[0022] Furthermore, the eyepiece assembly includes an eyepiece tube, and eyepiece one and eyepiece two are sequentially arranged inside the eyepiece tube along the collimating beam emission direction;

[0023] The eyepiece tube is a stepped tube, comprising a mounting section and an adjustment section coaxially connected in ascending order of inner diameter; a third stepped surface is formed between the mounting section and the adjustment section; a positioning protrusion ring is provided around the inner wall of the mounting section near the adjustment section.

[0024] The eyepiece is set within the mounting section via the centering frame three;

[0025] The second eyepiece is set within the mounting section via the fourth centering frame;

[0026] An outer pressure ring two is provided in the installation section for axially pressing the centering frame three.

[0027] A spacer ring 2 is provided between the three and four centering frames to ensure that the air gap between eyepiece 1 and eyepiece 2 is the same as the theoretical design, thus ensuring the imaging quality of the eyepiece group.

[0028] A trimming pad is provided between the centering frame four and the positioning protrusion ring.

[0029] Furthermore, the beam expander objective lens group includes a beam expander objective lens tube, and beam expander objective lens one, beam expander objective lens two and beam expander objective lens three arranged sequentially in the beam expander objective lens tube along the direction of the focused beam exit;

[0030] The beam-expanding objective lens tube is a stepped tube, comprising a focusing section, a first beam-expanding section, a second beam-expanding section, a third beam-expanding section, and a fourth beam-expanding section connected coaxially in ascending order of inner diameter; a fourth stepped surface is formed between the focusing section and the first beam-expanding section; and a fifth stepped surface is formed between the third beam-expanding section and the fourth beam-expanding section.

[0031] The eyepiece tube's adjustment section stop is fitted at the end of the focusing section furthest from the first beam expander section;

[0032] The beam expander objective lens is mounted in the first beam expander section via the centering frame five;

[0033] The second beam expander objective lens is mounted within the first beam expander section via the centering frame six;

[0034] The beam expander objective lens three is mounted in the third beam expander section via the centering frame seven;

[0035] A trimming pad three is provided between the fourth step surface and the centering frame five;

[0036] A spacer ring three is provided between the five and six centering frames to ensure that the air gap between the first and second beam expanders is the same as the theoretical design, thus ensuring the imaging quality of the beam expander group.

[0037] An outer pressure ring three is provided at the end of the first beam expansion section, away from the spacer ring three, for axially pressing the centering frame six;

[0038] A trimming pad four is provided between the fifth step surface and the centering frame seven;

[0039] An outer pressure ring four is provided at the end of the third expansion section away from the trimming pad four, for axially pressing the centering frame seven.

[0040] Furthermore, on the second step section, injection holes penetrating through the inner and outer walls are opened at positions corresponding to the first and second aligning frames, and XM-31 glue is injected into them.

[0041] The mounting section is provided with injection holes that penetrate its inner and outer walls at positions corresponding to the third and fourth centering frames, and XM-31 glue is injected into them.

[0042] The first beam expansion section has injection holes that penetrate its inner and outer walls at positions corresponding to the fifth and sixth centering frames, and XM-31 glue is injected into them.

[0043] The third beam expander section has injection holes that penetrate its inner and outer walls at positions corresponding to the centering frame 7, and XM-31 glue is injected into them.

[0044] Furthermore, the collimating lens tube, eyepiece tube, beam expander objective lens tube, and the inner wall of the housing are all subjected to black anodizing treatment to suppress stray light.

[0045] Furthermore, the box body is connected end to end in sequence to form a rectangular frame, consisting of a left side panel, a front side panel, a right side panel, and a rear side panel, as well as a bottom plate fixed to the bottom of the rectangular frame and a cover plate installed on the top of the rectangular frame.

[0046] Multiple cover plate supports are provided on the inner walls of the left side plate, front side plate, right side plate and rear side plate;

[0047] The cover plate is connected to the left side plate, right side plate, front side plate and rear side plate respectively by cover plate support blocks;

[0048] The fiber laser body is fixedly mounted on the base plate;

[0049] The collimating lens assembly is fixedly mounted on the base plate by a collimating lens assembly bracket, which is fixedly connected to the outer wall of the third step of the collimating lens assembly.

[0050] The beam expander assembly is fixedly mounted on the base plate by beam expander assembly bracket one and beam expander assembly bracket two; beam expander assembly bracket one is fixedly connected to the outer wall of the focusing section of the beam expander objective lens tube, and beam expander assembly bracket two is fixedly connected to the outer wall of the second beam expanding section of the beam expander objective lens tube.

[0051] Furthermore, an electrical control interface and a level mounting hole are respectively provided on the left side plate;

[0052] The electrical control interface is used to pass through the connection between the fiber laser and the external electrical control box, and a level is installed in the level mounting hole.

[0053] Furthermore, the light outlet is located on the front side panel, and a lens cover for dust prevention is provided in the light outlet.

[0054] Compared with the prior art, the beneficial effects of this utility model are:

[0055] 1. This utility model provides a laser source device for measuring parameters of large-aperture laser beams. It is suitable for large-aperture laser measurement experiments. While achieving laser collimation and beam expansion, it reduces the diffraction effects caused by various components in the optical system. Under the premise of outputting a laser beam with high collimation, high uniformity, and low wavefront aberration, it can ensure that the wavefront aberration is less than 0.1 μm (PV). The beam intensity uniformity is greater than 92% in the middle 90% region at a distance of more than 200 mm from the light source exit, which can meet the needs of large-aperture laser measurement experiments.

[0056] 2. The present invention provides a laser source device for measuring parameters of large-aperture beams. By matching the eyepiece tube with the beam expander objective tube, the coaxiality between the eyepiece group and the beam expander objective group can be guaranteed while ensuring high coaxiality, which facilitates assembly and adjustment.

[0057] 3. The laser source device for measuring parameters of large-aperture beams provided by this utility model has a level installed on the outer wall of the left side panel of the housing as a reference, which improves the ease of assembly and adjustment. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the external structure of a laser source device for measuring the parameters of a large-aperture beam according to an embodiment of the present invention.

[0059] Figure 2 This is a schematic diagram of the internal structure of a laser source device for measuring the parameters of a large-aperture beam according to an embodiment of the present invention.

[0060] Figure 3This is a cross-sectional view of the collimating lens group in an embodiment of a laser source device for measuring large-aperture beam parameters according to this utility model.

[0061] Figure 4 This is a cross-sectional view of the eyepiece assembly in an embodiment of a laser source device for measuring large-aperture beam parameters according to the present invention.

[0062] Figure 5 This is a cross-sectional view of the beam expander assembly in an embodiment of a laser source device for measuring large-aperture beam parameters according to this utility model.

[0063] Explanation of reference numerals in the attached figures:

[0064] 1-Box body; 11-Left side panel; 111-Electrical control interface; 112-Level mounting hole; 12-Right side panel; 13-Front side panel; 14-Rear side panel; 15-Bottom plate; 16-Cover plate; 17-Cover plate support block; 18-Lens cap;

[0065] 2-Collimating lens group; 201-Collimating lens tube; 202-Collimating lens one; 203-Collimating lens two; 204-Laser flange trimming pad; 205-Fiber optic sleeve support; 206-Trimming pad one; 207-Spacer one; 208-Outer pressure ring one; 209-Alignment frame one; 210-Alignment frame two;

[0066] 3-Beam expander group; 301-Eyepiece tube; 302-Beam expander objective tube; 303-Eyepiece 1; 304-Eyepiece 2; 305-Beam expander objective 1; 306-Beam expander objective 2; 307-Beam expander objective 3; 308-Outer pressure ring 2; 309-Spacer 2; 310-Trimming pad 2; 311-Trimming pad 3; 312-Spacer 3; 313-Outer pressure ring 3; 314-Trimming pad 4; 315-Outer pressure ring 4; 316-Centering frame 3; 317-Centering frame 4; 318-Centering frame 5; 319-Centering frame 6; 320-Centering frame 7; 321-Positioning convex ring;

[0067] 4-Collimating lens assembly support;

[0068] 5-Beam expander assembly support 1;

[0069] 6-Beam expander assembly support two;

[0070] 7-Level. Detailed Implementation

[0071] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0072] A laser source device for measuring the parameters of a large-aperture beam, the structure of which is as follows: Figure 1 , Figure 2As shown, the box includes a housing 1, which consists of a left side plate 11, a front side plate 13, a right side plate 12, and a rear side plate 14 connected end to end to form a rectangular frame, a bottom plate 15 fixed to the bottom of the rectangular frame, and a cover plate 16 covering the top of the rectangular frame. Multiple weight-reducing grooves are provided on the left side plate 11, the right side plate 12, the front side plate 13, and the rear side plate 14, and multiple cover plate support blocks 17 are provided on the inner wall of each of them. The cover plate 16 is connected to the left side plate 11, the right side plate 12, the front side plate 13, and the rear side plate 14 by screws through the cover plate support blocks 17.

[0073] The fiber laser body is fixedly mounted on the base plate 15. A collimating lens group 2 and a beam expander group 3 are coaxially arranged in sequence along the output optical path of the fiber laser. The output end of the fiber laser is coaxially and fixedly connected to the incident end of the collimating lens group 2, and is used to output an initial laser beam to the collimating lens group 2. The collimating lens group 2 is used to collimate the initial laser beam once to form a collimated beam with a diameter of 5mm. Considering the design margin, the beam expander group 3 has a beam expansion ratio of 24 times, including an eyepiece group and a beam expander objective group arranged coaxially in sequence along the output direction of the collimated beam. The image-side focal point of the eyepiece group and the object-side focal point of the beam expander objective group coincide. The incident end of the eyepiece group corresponds to the output end of the collimating lens group 3, and is used to initially focus the collimated beam to form a focused beam. The output end of the beam expander objective group corresponds to the light outlet, and is used to collimate and expand the focused beam a second time to achieve a preset aperture of 120mm and output it to the outside.

[0074] The focal length of collimating lens group 2 is 114mm, and its specific structure is as follows: Figure 3 As shown, it includes a collimating lens 202 and a collimating lens 203 arranged sequentially in the collimating lens barrel 201 along the initial laser beam emission direction;

[0075] The collimating lens tube 201 is a stepped tube, comprising a first stepped segment, a second stepped segment, and a third stepped segment connected coaxially in ascending order of inner diameter; a first stepped surface is formed between the first stepped segment and the second stepped segment; a second stepped surface is formed between the second stepped segment and the third stepped segment; a light-transmitting hole for initial laser beam incidence is provided at the end of the first stepped segment away from the second stepped segment; the emitting end of the fiber laser is installed at the light-transmitting hole of the first stepped segment through a fiber optic sleeve support 205, and a flange trimming gasket 204 is provided between the fiber optic sleeve support 205 and the first stepped segment;

[0076] Collimating lens 202 is installed in the second step section via centering frame 209; collimating lens 203 is installed in the second step section via centering frame 210; trimming washer 206 is provided between centering frame 209 and the first step surface; spacer 207 is provided between centering frame 209 and centering frame 210; outer pressure ring 208 is provided in the third step section for axially pressing centering frame 210.

[0077] The second step section has injection holes that penetrate its inner and outer walls at the positions corresponding to the first and second frames 209 and 210, respectively, and XM-31 glue is injected into them.

[0078] The collimating lens group 2 is fixedly installed on the base plate 15 by the collimating lens group bracket 4, and the collimating lens group bracket 4 is fixedly connected to the outer wall of the third step of the collimating lens group 2.

[0079] The eyepiece group has a focal length of 20mm, and its specific structure is as follows: Figure 4 As shown, it includes eyepiece 1 303 and eyepiece 2 304 arranged sequentially in the eyepiece tube 301 along the collimating beam emission direction; the eyepiece tube 301 is a stepped tube, including a mounting section and an adjustment section connected coaxially in ascending order of inner diameter; a third stepped surface is formed between the mounting section and the adjustment section; a positioning protrusion ring 321 is provided around the inner wall of the mounting section near the adjustment section.

[0080] Eyepiece 1 303 is mounted in the mounting section via centering frame 3 316; Eyepiece 2 304 is mounted in the mounting section via centering frame 4 317; An outer pressure ring 2 308 is provided in the mounting section for axially pressing centering frame 3 316; A spacer 2 309 is provided between centering frame 3 316 and centering frame 4 317; A trimming pad 2 310 is provided between centering frame 4 317 and positioning convex ring 321.

[0081] The eyepiece tube 301 mounting section and the corresponding positions of the centering frame 316 and centering frame 4 317 are all provided with glue injection holes that penetrate their inner and outer walls, which are filled with XM-31 glue.

[0082] The focal length of the beam expander objective group is 480mm, and its structure is as follows: Figure 5 As shown, the beam expander includes beam expander objective lens 305, beam expander objective lens 306, and beam expander objective lens 307, which are sequentially arranged within the beam expander objective lens tube 302 along the direction of the focused beam exit. The beam expander objective lens tube 302 is a stepped tube, including a focusing section, a first beam expander section, a second beam expander section, a third beam expander section, and a fourth beam expander section, which are coaxially connected in ascending order of inner diameter. A fourth stepped surface is formed between the focusing section and the first beam expander section; a fifth stepped surface is formed between the third beam expander section and the fourth beam expander section.

[0083] The adjustment section of the eyepiece tube 301 is fitted with a stop at the end of the focusing section away from the first beam expander section; the fitting clearance is 0.01mm. During assembly and adjustment, a cross wrench is used to tighten the eyepiece tube 301 to adjust the position of the eyepiece group so that the focal point of the eyepiece group is at the theoretically designed position and coincides with the focal point of the beam expander objective lens group, ensuring that the output light is parallel light. The focusing section of the beam expander objective lens tube 302 has multiple positioning holes that penetrate its inner and outer walls at positions corresponding to the adjustment section of the eyepiece tube 301. After assembly and adjustment, set screws are screwed into the positioning holes to position the eyepiece tube 301 and prevent the eyepiece tube 301 from radially shifting or circumferentially rotating in the beam expander objective lens tube 302.

[0084] A beam expander objective 305 is mounted in the first beam expander section via a centering frame 318; a beam expander objective 306 is mounted in the first beam expander section via a centering frame 319; a beam expander objective 307 is mounted in the third beam expander section via a centering frame 320; a trimming pad 311 is provided between the fourth step surface and the centering frame 318; a spacer 312 is provided between the centering frame 318 and the centering frame 319; an outer pressure ring 313 is provided at the end of the centering frame 319 in the first beam expander section away from the spacer 312, for axially pressing the centering frame 319; a trimming pad 414 is provided between the fifth step surface and the centering frame 320; an outer pressure ring 415 is provided at the end of the centering frame 320 in the third beam expander section away from the trimming pad 414, for axially pressing the centering frame 320.

[0085] The first beam expander section and the positions corresponding to the five-core frame 318 and the six-core frame 319, and the third beam expander section and the position corresponding to the seven-core frame 320, are all provided with injection holes that penetrate their inner and outer walls, which are filled with XM-31 glue.

[0086] The beam expander assembly 3 is fixedly mounted on the base plate 15 via beam expander assembly bracket 1 5 and beam expander assembly bracket 2 6; beam expander assembly bracket 1 5 is fixedly connected to the outer wall of the focusing section of the beam expander objective lens tube 302, and beam expander assembly bracket 2 6 is fixedly connected to the outer wall of the second beam expander section of the beam expander objective lens tube 302.

[0087] In this embodiment, the device is integrated through the housing 1, and external stray light is prevented from affecting the beam quality. The left side plate 11 is provided with an electrical control interface 111 and a level mounting hole 112. The electrical control interface 111 is used to pass through the connection between the fiber laser and the external electrical control box, thereby realizing the power adjustment of the fiber laser. A level 7 is installed in the level mounting hole 112 by screws to ensure that the device is placed horizontally during the assembly and adjustment process.

[0088] The aperture of the light outlet is 152.5mm and is located on the front side plate 13, where a lens cap 18 for dust protection is provided; handle mounting holes are provided on the left side plate 11 and the right side plate 12 respectively, and handles are installed in the handle mounting holes for easy handling when it is needed; in addition, in this embodiment, the collimating lens tube 201, eyepiece tube 301, beam expander objective lens tube 302, and the inner wall of the housing 1 are all black anodized to further suppress stray light.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. For those skilled in the art, modifications can be made to the specific technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by this utility model.

Claims

1. A laser source device for measuring parameters of a large-aperture beam, comprising a fiber laser, and a collimating lens group (2) and a beam expander group (3) coaxially arranged in sequence on the output optical path of the fiber laser; characterized in that: It also includes the housing (1); The side wall of the box (1) is provided with a light outlet; The fiber laser, collimating lens group (2) and beam expander group (3) are all fixedly installed inside the housing (1); The fiber laser body is fixedly connected to the housing (1), and its output end is coaxially fixedly connected to the input end of the collimating lens group (2) for emitting an initial laser beam to the collimating lens group (2). The collimating lens group (2) is used to collimate the initial laser beam once to form a collimated beam; The beam expander group (3) includes an eyepiece group and a beam expander objective group arranged coaxially along the collimating beam emission direction; the image-side focal point of the eyepiece group and the object-side focal point of the beam expander objective group coincide. The incident end of the eyepiece group corresponds to the exit end of the collimating lens group (2), and is used to focus the collimating beam to form a focused beam; The exit end of the beam expander objective lens group corresponds to the light exit port and is used to collimate and expand the focused beam a second time to achieve a preset aperture.

2. The laser source device for measuring large-aperture beam parameters according to claim 1, characterized in that: The collimating lens group (2) includes collimating lens one (202) and collimating lens two (203) arranged sequentially in the collimating lens tube (201) along the initial laser beam emission direction. The collimating lens tube (201) is a stepped tube, comprising a first stepped segment, a second stepped segment, and a third stepped segment connected coaxially in ascending order of inner diameter; a first stepped surface is formed between the first stepped segment and the second stepped segment; a second stepped surface is formed between the second stepped segment and the third stepped segment; a light-transmitting hole for initial laser beam incidence is provided at the end of the first stepped segment away from the second stepped segment; the emitting end of the fiber laser is connected to the light-transmitting hole; The collimating lens (202) is installed in the second step section via the centering frame (209); The collimating lens 2 (203) is installed in the second step section through the centering frame 2 (210); A trimming washer (206) is provided between the centering frame (209) and the first step surface; A spacer ring (207) is provided between the first concentric frame (209) and the second concentric frame (210); The third step section is provided with an outer pressure ring (208) for axially pressing the centering frame (210).

3. A laser source device for measuring the parameters of a large-aperture beam according to claim 2, characterized in that: The output end of the fiber laser is installed at the light-transmitting hole of the first step section through a fiber optic sleeve bracket (205); A flange trimming gasket (204) is provided between the fiber optic sleeve support (205) and the first step section.

4. A laser source device for measuring the parameters of a large-aperture beam according to claim 3, characterized in that: The eyepiece assembly includes an eyepiece tube (301), and eyepiece one (303) and eyepiece two (304) arranged sequentially in the eyepiece tube (301) along the collimated beam emission direction. The eyepiece tube (301) is a stepped tube, including an installation section and an adjustment section connected coaxially in sequence with increasing inner diameter; a third stepped surface is formed between the installation section and the adjustment section; a positioning protrusion (321) is provided around the inner wall of the installation section near the adjustment section. The eyepiece one (303) is set in the mounting section by the centering frame three (316); The second eyepiece (304) is set in the mounting section by the fourth centering frame (317); An outer pressure ring two (308) is provided in the installation section for axially pressing the centering frame three (316). A second spacer (309) is provided between the third (316) and the fourth (317) of the concentric frame; A trimming pad 2 (310) is provided between the centering frame 4 (317) and the positioning protrusion ring (321).

5. A laser source device for measuring the parameters of a large-aperture beam according to claim 4, characterized in that: The beam expander objective lens group includes a beam expander objective lens tube (302), and beam expander objective lens one (305), beam expander objective lens two (306) and beam expander objective lens three (307) arranged sequentially in the beam expander objective lens tube (302) along the direction of the focused beam output; The beam-expanding objective tube (302) is a stepped tube, comprising a focusing section, a first beam-expanding section, a second beam-expanding section, a third beam-expanding section, and a fourth beam-expanding section connected coaxially in ascending order of inner diameter; a fourth stepped surface is formed between the focusing section and the first beam-expanding section; and a fifth stepped surface is formed between the third beam-expanding section and the fourth beam-expanding section. The adjustment section stop of the eyepiece tube (301) is fitted at the end of the focusing section away from the first beam expanding section; The beam expander objective (305) is mounted in the first beam expander section via the centering frame (318); The second beam expander objective (306) is mounted in the first beam expander section via the sixth centering frame (319); The beam expander objective lens three (307) is mounted in the third beam expander section via the centering frame seven (320); A trimming pad three (311) is provided between the fourth step surface and the center frame five (318). A spacer ring three (312) is provided between the five (318) and six (319) concentric frames; An outer pressure ring three (313) is provided at the end of the first expansion section away from the spacer ring three (312) of the centering frame six (319) for axially pressing the centering frame six (319). A trimming pad four (314) is provided between the fifth step surface and the centering frame seven (320); An outer pressure ring four (315) is provided at the end of the third expansion section away from the trimming pad four (314) of the centering frame seven (320) for axially pressing the centering frame seven (320).

6. A laser source device for measuring the parameters of a large-aperture beam according to claim 5, characterized in that: On the second step, at the positions corresponding to the first (209) and the second (210) of the centering frame, there are glue injection holes that penetrate the inner and outer walls of the frame, which are filled with XM-31 glue. The mounting section is provided with injection holes that penetrate its inner and outer walls at positions corresponding to the third (316) and fourth (317) of the mounting frame, and XM-31 glue is injected into them. The first beam expansion section has injection holes that penetrate its inner and outer walls at positions corresponding to the fifth (318) and sixth (319) of the centering frame, and XM-31 glue is injected into them. The fourth beam expansion section has an injection hole that penetrates its inner and outer walls at the position corresponding to the center frame seven (320), and XM-31 glue is injected into it.

7. A laser source device for measuring the parameters of a large-aperture beam according to claim 6, characterized in that: The collimating lens tube (201), eyepiece tube (301), beam expander objective lens tube (302), and the inner wall of the housing (1) are all subjected to black anodizing treatment to suppress stray light.

8. A laser source device for measuring the parameters of a large-aperture beam according to claim 7, characterized in that: The box (1) includes a left side plate (11), a front side plate (13), a right side plate (12) and a rear side plate (14) that are connected end to end to form a rectangular frame, a bottom plate (15) fixed to the bottom of the rectangular frame, and a cover plate (16) covering the top of the rectangular frame. Multiple cover plate supports (17) are provided on the inner walls of the left side plate (11), front side plate (13), right side plate (12) and rear side plate (14). The cover plate (16) is connected to the left side plate (11), right side plate (12), front side plate (13) and rear side plate (14) respectively by cover plate support block (17); The fiber laser body is fixedly mounted on the base plate (15); The collimating lens group (2) is fixedly installed on the base plate (15) by the collimating lens group bracket (4), and the collimating lens group bracket (4) is fixedly connected to the outer wall of the third step of the collimating lens group (2); The beam expander assembly (3) is fixedly mounted on the base plate (15) by beam expander assembly bracket one (5) and beam expander assembly bracket two (6); beam expander assembly bracket one (5) is fixedly connected to the outer wall of the focusing section of the beam expander objective lens tube (302), and beam expander assembly bracket two (6) is fixedly connected to the outer wall of the second beam expander section of the beam expander objective lens tube (302).

9. A laser source device for measuring the parameters of a large-aperture beam according to claim 8, characterized in that: The left side plate (11) is provided with an electrical control interface (111) and a level mounting hole (112); the electrical control interface (111) is used to pass through the connection between the fiber laser and the external electrical control box; a level (7) is provided in the level mounting hole (112).

10. A laser source device for measuring the parameters of a large-aperture beam according to claim 8, characterized in that: The light outlet is located on the front side plate (13), and a lens cover (18) for dust prevention is provided in the light outlet.

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