Tool convenient for laser beam scattering test of high-power fiber laser
By designing a tool that includes a fixed position wedge mirror and a waste light storage device, the problem of too long debugging time when testing laser beam dissipation by high-power fiber lasers is solved, and the effect of simplifying the debugging process and shortening the debugging time is achieved.
Patent Information
- Application Number
- CN202411823414.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-04-01
AI Technical Summary
During the debugging and acceptance of high-power fiber lasers, the process of testing laser beam dispersion requires frequent adjustment and fixing of the position and angle of the wedge mirror and waste light storage device, resulting in too long debugging time.
A tool for easy laser beam scatter testing of high-power fiber lasers is designed, including a box, light inlet, light outlet, several wedge mirrors and waste light storage devices. The wedge mirror and waste light storage device are packaged into an integral tool box according to a fixed position, reducing the debugging time of each test.
Through this tooling, the debugging time of each test laser beam dispersion can be greatly saved, the debugging process is simplified, and the laser beam dispersion test of high-power fiber lasers is more convenient and fast.
Smart Images
Figure CN119738934A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of high-power optical fiber lasers and relates to a tooling for facilitating the laser beam divergence test of high-power optical fiber lasers. Background Art
[0002] In recent years, high-power fiber lasers have been widely used in military, industrial processing, scientific research and other fields due to their advantages such as good beam quality, high power, compact structure and high reliability. Among them, the beam divergence angle is one of its core technical indicators, which has a significant impact on the damage capability and transmission distance of the laser system. Therefore, in the process of developing and accepting high-power fiber lasers, it is necessary to test the laser beam divergence. The lens focal plane method (GJB 5441-2005 solid laser test method) is often used to test the laser beam divergence. A long focal length focusing mirror is placed at an appropriate position in the optical path, and a CCD system is used to measure the spot diameter d on the focal plane of the focusing mirror. The laser beam divergence angle can be calculated according to the formula θ=d / f. However, for high-power fiber lasers, the laser output power can reach several kilowatts or even tens of thousands of watts, and the CCD that measures the spot diameter cannot withstand such high light energy. Therefore, when using the lens focal plane method to test laser beam divergence, the laser beam is first attenuated, mainly using multiple wedge mirrors and several waste light collection devices (water cooling is required when necessary) to reduce the laser output power to an ideal state, and then the laser beam divergence test is completed in accordance with "GJB 5441-2005 Solid-State Laser Test Method 5.9.1 Focusing Mirror Method". Among them, the wedge mirror is mainly used for power attenuation and optical path change; the waste light collection device (with water cooling when necessary) is used to collect the optical power of the light transmitted by the wedge mirror and the optical power of the secondary / tertiary reflections. In this process, each time the laser beam divergence is tested, it is necessary to readjust and fix the position and angle of the wedge mirror and the position and angle of the waste light collection device, which takes a lot of time. Therefore, it is necessary to propose a tooling that can test laser beam divergence more conveniently and quickly. Summary of the invention
[0003] (I) Purpose of the invention
[0004] During the debugging and acceptance of high-power fiber lasers, laser beam divergence tests must be performed in multiple links, and the optical path needs to be rebuilt for each test. The debugging of multiple wedge mirrors and transmitted light / secondary reflected light collection takes a lot of time. The present invention provides a tooling that is convenient for high-power fiber laser laser beam divergence testing, simplifies the debugging process, and shortens the debugging time.
[0005] (II) Technical solution
[0006] In order to solve the above technical problems, the present invention provides a tooling for facilitating the laser beam divergence test of a high-power fiber laser, which comprises a box body 4, a light inlet 1-1 and a light outlet 1-2 opened on the box body 4, a plurality of wedge-shaped mirrors arranged in the box body 4, and a waste light receiving device arranged on a box board of the box body 4; the high-power fiber laser outputs laser light, which is injected through the light inlet 1-1, and is reflected by the plurality of wedge-shaped mirrors in turn, and the reflected light is emitted through the light outlet 1-2 for laser beam divergence test; the light transmittance of the wedge-shaped mirror is 96%, and the light reflectance is 4%; among the plurality of wedge-shaped mirrors, the waste light receiving device is arranged on the light transmission side of the first two wedge-shaped mirrors.
[0007] Among the several wedge-shaped mirrors, the first waste light collecting device 3-1 is arranged on the light-transmitting side of the first wedge-shaped mirror 2-1, and the second waste light collecting device 3-2 is arranged on the secondary light-reflecting side of the first wedge-shaped mirror 2-1.
[0008] Among the several wedge-shaped mirrors, the second wedge-shaped mirror 2-2 is located on the reflective side of the first wedge-shaped mirror 2-1, and the third waste light collection device 3-3 is arranged on the light-transmitting side of the second wedge-shaped mirror 2-2.
[0009] Among them, the plurality of wedge-shaped mirrors also includes a third wedge-shaped mirror 2-3, which is located on the reflective side of the second wedge-shaped mirror 2-2.
[0010] It also includes: a fourth wedge-shaped mirror 2-4, which is located in the box 4 and arranged on the reflective side of the third wedge-shaped mirror 2-3, and the light outlet 1-2 is located on the reflective side of the fourth wedge-shaped mirror 2-4.
[0011] It also includes: a fourth wedge-shaped mirror 2-4, which is located outside the box 4, the light outlet 1-2 is located on the reflective side of the third wedge-shaped mirror 2-3, and the fourth wedge-shaped mirror 2-4 is located on the light outlet side of the light outlet 1-2.
[0012] The first waste light collection device 3 - 1 , the second waste light collection device 3 - 2 and the third waste light collection device 3 - 3 may be provided with a water cooling mechanism.
[0013] Wherein, window mirrors are installed on the light inlet 1-1 and the light outlet 1-2, and the light transmittance of the window mirrors is not less than 99.8%.
[0014] The box body is made of hard aluminum plates with black inner walls.
[0015] The present invention also provides a high-power fiber laser beam divergence test system, which includes a tooling, a laser, a focusing lens with a focal length of f, an attenuation plate and a CCD lens. The laser emitted by the laser is emitted through the tooling, passes through the focusing lens and the attenuation plate, and then enters the CCD lens at the focus. The size d of the light spot is directly read through the CCD display screen, and the laser beam divergence value is calculated using the divergence angle formula θ=d / f.
[0016] (III) Beneficial effects
[0017] The above technical solution provides a tooling that is convenient for testing the laser beam divergence of a high-power fiber laser. Three window mirrors, four wedge-shaped mirrors and three waste light collection devices (with water cooling when necessary) are packaged into a tooling box in fixed positions. During testing, this part is directly used as an integral tooling, and the wedge-shaped mirrors and waste light collection devices are no longer debugged one by one, which greatly saves the debugging time for each laser beam divergence test. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a view of the test tooling in Example 1 of the present invention.
[0019] Figure 2 This is a view of the test tooling in Example 2 of the present invention. DETAILED DESCRIPTION
[0020] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.
[0021] like Figure 1 and Figure 2 As shown, the tooling for facilitating the laser beam divergence test of a high-power fiber laser in this embodiment includes a box body 4, a light inlet 1-1 and a light outlet 1-2 opened on the box body 4, a plurality of wedge-shaped mirrors arranged in the box body 4, and a waste light receiving device arranged on a box board of the box body 4; the high-power fiber laser outputs laser light, which is injected through the light inlet 1-1, and is reflected by the plurality of wedge-shaped mirrors in turn, and the reflected light is emitted through the light outlet 1-2 for laser beam divergence test; the light transmittance of the wedge-shaped mirror is 96%, and the light reflectance is 4%; among the plurality of wedge-shaped mirrors, the waste light receiving device is arranged on the light transmission side of the first two wedge-shaped mirrors.
[0022] Among the plurality of wedge-shaped mirrors, a first waste light collecting device 3-1 is arranged on the light-transmitting side of the first wedge-shaped mirror 2-1, and a second waste light collecting device 3-2 is arranged on the secondary light-reflecting side of the first wedge-shaped mirror 2-1.
[0023] Among the plurality of wedge-shaped mirrors, the second wedge-shaped mirror 2-2 is located on the light-reflecting side of the first wedge-shaped mirror 2-1, and the third waste light collecting device 3-3 is arranged on the light-transmitting side of the second wedge-shaped mirror 2-2.
[0024] The plurality of wedge-shaped mirrors also include a third wedge-shaped mirror 2-3, which is located on the reflective side of the second wedge-shaped mirror 2-2.
[0025] Based on the above structure, one implementation of this embodiment is as follows: Figure 1 As shown, the tooling also includes: a fourth wedge-shaped mirror 2-4, located in the box 4, arranged on the reflective side of the third wedge-shaped mirror 2-3, and the light outlet 1-2 is located on the reflective side of the fourth wedge-shaped mirror 2-4.
[0026] Based on the above structure, another implementation of this embodiment is as follows Figure 2 As shown, the tooling also includes: a fourth wedge-shaped mirror 2-4, located outside the box 4, the light outlet 1-2 is located on the reflective side of the third wedge-shaped mirror 2-3, and the fourth wedge-shaped mirror 2-4 is located on the light outlet side of the light outlet 1-2.
[0027] In this embodiment, the first waste light collection device 3 - 1 , the second waste light collection device 3 - 2 and the third waste light collection device 3 - 3 may be provided with a water cooling mechanism.
[0028] Window mirrors are installed on the light inlet 1-1 and the light outlet 1-2, and the light transmittance of the window mirrors is not less than 99.8%.
[0029] The box is made of hard aluminum plates with black inner walls.
[0030] Figure 1 The working principle of the tooling shown is as follows: incident light enters the box 4 through the light inlet 1-1, and after passing through the first wedge-shaped mirror 2-1, 96% of the light is transmitted to the first waste light collection device 3-1, and 4% of the reflected light is incident on the second wedge-shaped mirror 2-2. Since the output power of high-power fiber lasers is as high as kilowatts or even tens of thousands of watts, the power of the secondary reflected light after passing through the first wedge-shaped mirror 2-1 is also very high, and the reflected light is collected at the second waste light collection device 3-2.
[0031] Of the light incident on the second wedge-shaped mirror 2 - 2 , 96% of the light is transmitted to the third waste light collection device 3 - 3 for waste light collection, and 4% of the light is reflected on the third wedge-shaped mirror 2 - 3 .
[0032] 96% of the light incident on the third wedge-shaped mirror 2-3 is transmitted and directly incident on the box body. Since the box body 4 is made of hard aluminum plates with black inner walls, it can withstand smaller optical power and play a role in storing and dissipating heat; 4% of the light is reflected on the fourth wedge-shaped mirror 2-4.
[0033] 96% of the light incident on the fourth wedge-shaped mirror 2-4 is transmitted and directly incident on the box 4. Because the box 4 is made of hard aluminum plates with black inner walls, it can withstand smaller optical power and play a role in storing and dissipating heat; 4% of the light is reflected and output through the light outlet 1-2.
[0034] If the test space does not allow, the fourth wedge mirror 2-4 can be placed outside the box 4 to change the direction of the light path. Figure 2 The working principle of the tooling shown is: the high-power fiber laser outputs laser light, first passes through the light inlet 1-1, the light transmittance of the window mirror is not less than 99.8%, and is incident on the first wedge mirror 2-1.
[0035] After the incident light passes through the first wedge-shaped mirror 2-1, 96% of the light is transmitted to the first waste light collection device 3-1, and 4% of the reflected light is incident on the second wedge-shaped mirror 2-2. Since the output power of the high-power fiber laser is as high as kilowatts or even tens of thousands of watts, the power of the secondary reflected light after passing through the first wedge-shaped mirror 2-1 is also very high, and the reflected light is collected in the second waste light collection device 3-2.
[0036] Of the light incident on the second wedge-shaped mirror 2 - 2 , 96% of the light is transmitted to the third waste light collection device 3 - 3 for waste light collection, and 4% of the light is reflected on the third wedge-shaped mirror 2 - 3 .
[0037] 96% of the light incident on the third wedge-shaped mirror 2-3 is transmitted through and directly incident on the box body 4. Since the box body 4 is made of hard aluminum plates with black inner walls, it can withstand a smaller optical power and play a role in storing and dissipating heat; 4% of the light is reflected and output to the fourth wedge-shaped mirror 2-4 through the light outlet 1-2, wherein the transmittance of the window mirror of the light outlet 1-2 is not less than 99.8%.
[0038] Of the light incident on the fourth wedge-shaped mirror 2-4, 4% of the light is reflected and passed through a focusing lens etc. to undergo a beam divergence test.
[0039] When the test fixture of this embodiment is used, the full-power laser P0 output by the high-power fiber laser passes through the laser beam dispersion test fixture. The light beam first passes through the window mirror, and the light transmittance of the window mirror is as high as 99.8%. Its function is to protect the tool box from dust and contamination. Then it passes through four wedge-shaped mirrors in sequence. Each time it passes through one of the wedge-shaped mirrors, 96% of the power is transmitted and 4% of the power is reflected. Among them, the transmitted light will be collected by the waste light collection device (with water cooling if necessary), and the reflected light will be reflected to the next wedge-shaped mirror. It is particularly noted that the optical power of the secondary reflected light of the first wedge-shaped mirror 2-1 is still relatively large, and waste light collection is also required. In this way, after passing through the fixture, the output laser power is attenuated to 0.04 4 P0, and the spot shape remains basically unchanged. At this time, the laser with lower power passes through a focusing lens with a focal length of f, and then is attenuated by a set of attenuation sheets before it can be safely shot into the CCD lens at the focus. The size of the spot d is directly read through the CCD display screen, and the divergence angle formula θ=d / f can be used to calculate the beam divergence value of the laser.
[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A tool for facilitating the test of laser beam divergence of a high-power fiber laser, characterized in that: The invention comprises a box (4), a light inlet (1-1) and a light outlet (1-2) provided on the box (4), a plurality of wedge-shaped mirrors arranged in the box (4), and a waste light collection device arranged on a box plate of the box (4); laser light output by a high-power optical fiber laser is injected through the light inlet (1-1), and after being reflected by the plurality of wedge-shaped mirrors in sequence, the reflected light is emitted through the light outlet (1-2) for laser beam dispersion testing; the light transmittance of the wedge-shaped mirrors is 96%, and the light reflectance is 4%; and the waste light collection device is arranged on the light transmission side of the first two wedge-shaped mirrors among the plurality of wedge-shaped mirrors.
2. The tooling for facilitating high-power fiber laser beam divergence testing as claimed in claim 1, characterized in that: Among the plurality of wedge-shaped mirrors, a first waste light collecting device (3-1) is arranged on the light-transmitting side of the first wedge-shaped mirror (2-1), and a second waste light collecting device (3-2) is arranged on the secondary light-reflecting side of the first wedge-shaped mirror (2-1).
3. The tooling for facilitating high-power fiber laser beam divergence testing as claimed in claim 2, characterized in that: Among the plurality of wedge-shaped mirrors, the second wedge-shaped mirror (2-2) is located on the light-reflecting side of the first wedge-shaped mirror (2-1), and the third waste light collecting device (3-3) is arranged on the light-transmitting side of the second wedge-shaped mirror (2-2).
4. The tooling for facilitating high-power fiber laser beam divergence testing as claimed in claim 3, characterized in that: The plurality of wedge-shaped mirrors also include a third wedge-shaped mirror (2-3) located on the light reflecting side of the second wedge-shaped mirror (2-2).
5. The tooling for facilitating high-power fiber laser beam divergence testing as claimed in claim 4, characterized in that: Also includes: The fourth wedge-shaped mirror (2-4) is located in the box (4) and is arranged on the light reflecting side of the third wedge-shaped mirror (2-3); the light outlet (1-2) is located on the light reflecting side of the fourth wedge-shaped mirror (2-4).
6. The tooling for facilitating high-power fiber laser beam divergence testing as claimed in claim 4, characterized in that: Also includes: The fourth wedge-shaped mirror (2-4) is located outside the box (4), the light outlet (1-2) is located on the light reflecting side of the third wedge-shaped mirror (2-3), and the fourth wedge-shaped mirror (2-4) is located on the light exiting side of the light outlet (1-2).
7. The tooling for facilitating high-power fiber laser beam divergence testing as claimed in claim 5 or 6, characterized in that: The first waste light collection device (3-1), the second waste light collection device (3-2) and the third waste light collection device (3-3) can be provided with a water cooling mechanism.
8. The tooling for facilitating high-power fiber laser beam divergence testing as claimed in claim 7, characterized in that: Window mirrors are installed on the light inlet (1-1) and the light outlet (1-2), and the light transmittance of the window mirrors is not less than 99.8%.
9. The tooling for facilitating high-power fiber laser beam divergence testing as claimed in claim 8, characterized in that: The box is made of hard aluminum plates with black inner walls.
10. A high power fiber laser beam divergence test system, characterized in that: It comprises the tooling as claimed in claim 9, a laser, a focusing lens with a focal length of f, an attenuation plate and a CCD lens. The laser emitted by the laser is emitted through the tooling, passes through the focusing lens and the attenuation plate, and then enters the CCD lens at the focus. The size d of the light spot is directly read through the CCD display screen, and the divergence angle formula θ=d / f is used to calculate the beam divergence value of the laser.