Device and method for testing index change of laser in actual use process

Abstract

The invention provides a device and a method for testing index change of a laser in an actual use process. The device comprises a first beam splitter prism, a reflection unit, a second beam splitter prism, an M2 tester and a spectrograph, the output and input light of the laser to be tested enters the first beam splitter prism, the first beam splitter prism outputs a first light beam to enter the reflection unit, the second beam splitter prism outputs a second light beam to enter the second beam splitter prism, the second beam splitter prism outputs a third light beam to enter the M2 tester, and the fourth light beam output by the second beam splitter prism enters the spectrometer. The reflection unit outputs reflected light, and the reflected light outputs a fifth light beam through the first beam splitter prism to enter the to-be-tested laser. According to the invention, changes of various optical parameters of the to-be-tested laser in the application process become simple and easy to measure, and the reliability of the to-be-tested laser in the application process can be analyzed more easily.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber lasers, and in particular, to a device and method for testing the index change of a laser during actual use. Background Art

[0002] For the aging of fiber lasers, at present, it mainly relies on aging with direct light output without load to judge the long-term reliability of the laser. This aging scheme not only cannot reflect the actual working conditions of the laser at the client side, but also cannot give an assessment of the risks of the laser in different application scenarios. To solve this problem, existing solutions mostly directly purchase application equipment for application aging, which consumes a large amount of manpower and material resources, the testing process is complex, and a quantitative standard cannot be given.

[0003] Before the fiber laser is shipped, the temperatures of each device and fusion point are at the temperatures under non-processing conditions. If it is necessary to know the temperatures of each risk point inside the device, the device needs to be moved to a cutting machine tool or a welding machine tool for testing, which greatly improves the testing complexity, and the cleanliness of the application scenario will also pose a certain risk to the laser.

[0004] When the fiber laser is applied, the beam quality, nonlinearity, and thermal lens effect will all change under the influence of the reflected light. Most of the abnormalities are based on the theoretical calculations and guesses of engineers, and there are no actual test results. Summary of the Invention

[0005] The first object of the present invention is to provide a device for testing the index change of a laser during actual use, which is more in line with the actual working conditions of the laser and is more convenient to implement.

[0006] The second object of the present invention is to provide a laser testing method that is more in line with the actual working conditions of the fiber laser and is more convenient to implement.

[0007] To achieve the above first object, the present invention provides a device for testing the index change of a laser during actual use, which includes: a first beam splitting prism, a reflection unit, a second beam splitting prism, an M 2 tester, and a spectrometer; the incident light output by the laser to be tested enters the first beam splitting prism, the first beam output by the first beam splitting prism enters the reflection unit, the second beam output by the first beam splitting prism enters the second beam splitting prism, the third beam output by the second beam splitting prism enters the M 2 tester, and the fourth beam output by the second beam splitting prism enters the spectrometer; the reflection unit is used to output reflected light to the first beam splitting prism, and the reflected light passes through the first beam splitting prism to output a fifth beam into the power detection module of the laser to be tested; the power detection module is used to detect the output power of the laser to be tested under the influence of the reflected light, M 2The tester is used to detect the beam quality of the laser under test under the influence of reflected light, and the spectrometer is used to detect the spectrum of the laser under test under the influence of reflected light.

[0008] As can be seen from the above solution, in the present invention, the incident light output by the laser under test is connected after setting the first beam splitting prism and the reflection unit, so that the return light in different application scenarios of the fiber laser can be simulated, and this return light acts on the laser under test in the reverse direction. At the same time, the present invention also sets a second beam splitting prism, so that the incident light output by the laser under test is synchronized to M according to a certain beam splitting ratio. 2 The tester and the spectrometer, and thus through the power detection module of the laser under test itself, combined with the 2 changes in various data collected by the tester and the spectrometer, the working conditions of the laser under test in different application scenarios can be analyzed. The present invention makes the changes in various optical parameters of the laser under test during application simple and easy to measure, making it easier to analyze the reliability of the laser under test in application; the present invention can be placed in the laser manufacturing workshop for testing, simplifying it into one manufacturing process, rather than having to purchase application equipment for application aging testing after the laser is manufactured.

[0009] A further solution is that for the collimating lens, the incident light output by the laser under test enters the first beam splitting prism through the collimating lens, and the fifth beam enters the power detection module of the laser under test through the collimating lens.

[0010] Thus, it can improve the quality and stability of the laser output by the laser under test and the received reflected return light.

[0011] A further solution is that for the focusing lens, the third beam output by the second beam splitting prism enters the 2 tester through the focusing lens, and the seventh beam output by the second beam splitting prism enters the 2 tester through the focusing lens.

[0012] Thus, it can improve the stability of the beam entering the 2 tester, so that the 2 tester can reliably test the incoming beam.

[0013] A further solution is that the laser under test includes a temperature detection module, and the temperature detection module is used to detect the temperature of the internal components of the laser under test.

[0014] Thus, it can simultaneously realize the detection of the temperature of the internal components of the laser under test, and this temperature is more in line with the actual situation of the laser under test, improving the test effect.

[0015] A further solution is that the reflection unit is a total reflection copper.

[0016] Thus, a good reflection effect can be achieved.

[0017] A further solution is that the splitting ratio of the first beam splitting prism is one of the following: 90:10, 92:8, 95:5, 97:3.

[0018] Thus, it can be seen that the splitting ratio can be changed according to the requirements of the actual simulation application scenario to adapt to the tests under different application scenarios.

[0019] To achieve the above second object, a laser testing method provided by the present invention includes the following steps: connecting the laser to be tested to the device for measuring the index change during the actual use of the above-mentioned test laser; starting the laser to be tested to output incident light, and collecting the detection results of the M 2 tester, spectrometer and power detection module; comparing the detection results with the preset test indexes to determine the test results.

[0020] As can be seen from the above solution, the present invention can obtain the indexes of the laser to be tested when working under various loads through the plug-in test, and the test is convenient and efficient. Due to the simulated actual working scenario, it can avoid the situation that the laser passes the aging test in the factory but the components fail in actual application.

[0021] A further solution is that before starting the laser to be tested to output incident light, adjust the splitting ratio of the first beam splitting prism according to the current simulated application scenario; start the laser to be tested to output incident light, and collect the first detection results of the M 2 tester, spectrometer and power detection module; pause the output of the laser to be tested, and adjust the splitting ratio of the first beam splitting prism according to the next simulated application scenario; start the laser to be tested to output incident light, and collect the second detection results of the M 2 tester, spectrometer and power detection module; compare the first detection results and the second detection results with the preset test indexes to determine the test results.

[0022] Thus, it can be seen that by adjusting the splitting ratio, different application scenarios of the laser to be tested can be simulated.

[0023] A further solution is that the laser to be tested includes a temperature detection module for detecting the temperature of the internal components of the laser to be tested; after adjusting the splitting ratio of the first beam splitting prism according to the current simulated application scenario, start the laser to be tested to output incident light, and collect the first detection results of the M 2 tester, spectrometer, power detection module and temperature detection module; after adjusting the splitting ratio of the first beam splitting prism according to the next simulated application scenario, start the laser to be tested to output incident light, and collect the second detection results of the M 2 tester, spectrometer, power detection module and temperature detection module.

[0024] Thus, when obtaining other indicators, the temperature of the internal components of the laser under test can also be synchronously detected, improving the test efficiency.

[0025] A further solution is that when adjusting the splitting ratio of the first beam splitting prism according to the current simulated application scenario or the next simulated application scenario, the angle of the reflection unit is also adjusted.

[0026] Thus, it can be seen that by adjusting the angle of the reflection unit, the reflection effect of the first beam can be improved. Description of the Drawings

[0027] Figure 1 It is the optical path design diagram of the incident light in the device embodiment for testing the index change of the laser in the actual use process of the present invention.

[0028] Figure 2 It is the optical path design diagram of the reflected light in the device embodiment for testing the index change of the laser in the actual use process of the present invention.

[0029] Figure 3 It is the flowchart of the laser testing method embodiment of the present invention.

[0030] The present invention will be further described below in conjunction with the drawings and embodiments. Detailed Embodiments

[0031] Device embodiment for testing the index change of the laser in the actual use process:

[0032] Refer to Figure 1 , this embodiment includes a collimating lens 11, a first beam splitting prism 12, a reflection unit 13, a second beam splitting prism 14, a focusing lens 15, an M 2 tester 16, and a spectrometer 17.

[0033] The collimating lens 11 is used to collimate the laser beam output by the laser under test 2, improving the quality and stability of the laser beam.

[0034] The first beam splitting prism 12 is used to divide the incident light into a first beam and a second beam according to the set splitting ratio, and is used to divide the reflected light of the reflection unit 13 into a fifth beam.

[0035] The splitting ratio of the first beam splitting prism 12 is selected according to the application scenario to be simulated. For example, in the actual use of the laser, it will be used to cut materials such as stainless steel, carbon steel, aluminum, and brass. The absorption rates of these materials for laser are carbon steel > stainless steel > aluminum > brass. Therefore, the light hitting the reflection unit by the first beam splitting prism also needs to be different.

[0036] In this embodiment, when simulating the application scenario of laser cutting carbon steel, the splitting ratio of the first beam splitting prism 12 is set to 97:3. Thus, the first light beam hitting the reflection unit is 3% incident light, and the second light beam entering the second beam splitting prism 14 is 97% incident light. When simulating the application scenario of laser cutting carbon steel, the splitting ratio of the first beam splitting prism 12 is set to 97:3. Thus, the first light beam hitting the reflection unit is 3% incident light, and the second light beam entering the second beam splitting prism 14 is 97% incident light. When simulating the application scenario of laser cutting stainless steel, the splitting ratio of the first beam splitting prism 12 is set to 95:5. Thus, the first light beam hitting the reflection unit is 5% incident light, and the second light beam entering the second beam splitting prism 14 is 95% incident light. When simulating the application scenario of laser cutting aluminum, the splitting ratio of the first beam splitting prism 12 is set to 92:8. Thus, the first light beam hitting the reflection unit is 8% incident light, and the second light beam entering the second beam splitting prism 14 is 92% incident light. When simulating the application scenario of laser cutting brass, the splitting ratio of the first beam splitting prism 12 is set to 90:10. Thus, the first light beam hitting the reflection unit is 10% incident light, and the second light beam entering the second beam splitting prism 14 is 90% incident light. It can be understood that for different application scenarios, those skilled in the art can also select corresponding splitting ratios.

[0037] The reflection unit 13 is used to reflect the received first light beam. The reflection unit 13 is made of a material with a high reflectivity, so as to more accurately simulate the return light of different application scenarios. In this embodiment, total reflection red copper is used.

[0038] The second beam splitting prism 14 is used to divide the second light beam entering from the first beam splitting prism 12 into a third light beam and a fourth light beam according to the set splitting ratio. The second beam splitting prism 14 is used to split the light beam entering from the first beam splitting prism 12 into two light beams, so that the two light beams enter the M 2 tester 16 and the spectrometer 17 respectively, and then the detection of the beam quality and the spectrum can be realized simultaneously.

[0039] The focusing lens 15 is used to focus the third light beam to ensure the beam quality of the light beam entering the M 2 tester 16 and improve the detection effect of the M 2 tester.

[0040] M 2 The M tester 16 is used to analyze the beam quality of high-power light, and the spectrometer 17 is used to collect the spectrum, both of which can be realized by existing equipment.

[0041] The laser 2 to be tested is a fiber laser that needs to be tested, and the laser head of this laser is connected to the device of this embodiment. By outputting laser light from the laser 2 to be tested, the device of this embodiment simulates the actual use environment of the laser, so that the test results of the laser 2 to be tested can be determined by recording the changes in various indicators during the process of the laser 2 to be tested outputting laser light.

[0042] Specifically, the incident light output by the laser 2 to be tested enters the first beam splitting prism 12 through the collimating lens 11. The first light beam output by the first beam splitting prism 12 enters the reflection unit 13, and the second light beam output by the first beam splitting prism 12 enters the second beam splitting prism 14. The third light beam output by the second beam splitting prism 14 enters the M 2 tester 16 through the focusing lens 15, and the fourth light beam output by the second beam splitting prism 14 enters the spectrometer 17.

[0043] See Figure 2 , the reflection unit 13 is used to reflect the first light beam and output reflected light to the first beam splitting prism 12. The reflected light is transmitted and output as the fifth light beam through the first beam splitting prism 12, and the fifth light beam enters the laser 2 to be tested through the collimating lens 11.

[0044] A power detection module and a temperature detection module are arranged in the laser 2 to be tested. The power detection module detects the output power of the laser 2 to be tested under the influence of the reflected light. The power detection module includes a photoelectric converter. When the laser 2 to be tested outputs, it will be split (usually taking 1%) and then enter the photoelectric converter. The split light obtained is converted into an electrical signal through the photoelectric converter, and the output power of the laser 2 to be tested is calculated by processing this electrical signal. The temperature detection module includes temperature sensors arranged on different internal components in the laser 2 to be tested, and is used to detect the temperature changes of various internal components during the operation of the laser 2 to be tested. M 2 The M tester 16 is used to detect the beam quality of the laser 2 to be tested under the influence of the reflected light, and the spectrometer 17 is used to detect the spectrum of the laser 2 to be tested under the influence of the reflected light.

[0045] Under the influence of the reflected light, the incident light output by the laser 2 to be tested will be changed, thereby changing the first light beam, the second light beam, the third light beam, the fourth light beam, and the fifth light beam. Furthermore, the power detection module, the temperature detection module, M 2 tester 16 and spectrometer 17 can respectively detect the changes in indicators under the influence of the reflected light.

[0046] Embodiment of the laser test method:

[0047] This embodiment is implemented based on the device of the above embodiment. After starting the laser to be tested to output incident light, collect M 2The detection results of the tester, spectrometer, power detection module, and temperature detection module are obtained, and then the detection results are compared with the preset test indicators to determine the test results. Refer to Figure 3 , which specifically includes the following steps:

[0048] S1: Adjust the splitting ratio of the first beam splitter prism according to the current simulated application scenario.

[0049] S2: Start the laser under test to output incident light, and collect the first detection results of the 2 tester, spectrometer, power detection module, and temperature detection module.

[0050] S3: Pause the output of the laser under test, and adjust the splitting ratio of the first beam splitter prism according to the next simulated application scenario.

[0051] S4: Start the laser under test to output incident light, and collect the second detection results of the 2 tester, spectrometer, power detection module, and temperature detection module.

[0052] S5: Compare the first detection results and the second detection results with the preset test indicators to determine the test results.

[0053] When adjusting the splitting ratio of the first beam splitter prism in the above steps S1 and S3, the angle of the reflection unit can also be adjusted so that the reflection unit can better reflect the first light beam.

[0054] In the above steps S2 and S4, the 2 tester, spectrometer, power detection module, and temperature detection module detect the changes in various data under the combined action of incident light and reflected light. For example, the 2 tester detects the change in the beam quality under the combined action of incident light and reflected light.

[0055] In the above step S5, the preset test indicators are set according to actual needs. For example, the 2 threshold of the beam quality factor, temperature threshold, etc. obtained by the tester under different simulated application scenarios can be set, and it is determined whether the laser under test passes the test according to whether the preset test indicators are met.

[0056] In summary, after inserting the laser head of the laser under test, the present invention realizes the return light feedback under different application scenarios through the cooperation of the first beam splitter prism and the reflection unit, and then through the 2The tester, spectrometer, power detection module, and temperature detection module detect the changes in various optical parameters under the action of retroreflection. Place the output head of the laser in this device. Based on the retroreflection in different application scenarios, this device acts on the laser in the reverse direction, and finally tests the changes in various parameters of the laser in this application scenario, such as the temperature of each device, beam quality, nonlinearity, thermal lens change, etc. The present invention makes it simple and easy to measure the changes in various optical parameters of the laser to be tested during the application process, making it easier to analyze the reliability of the laser to be tested in the application; the present invention can be placed in the laser manufacturing workshop for testing, simplifying it into a manufacturing process, instead of having to purchase application equipment for application aging testing after the laser is manufactured.

[0057] Finally, it should be emphasized that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. For example, in the embodiment of the laser testing method, more simulated application scenarios are set and the detection results under different simulated application scenarios are detected, and finally, the detection results are compared with the preset test indicators. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for testing the changes in indicators of a laser during actual use, characterized in that: include: The first beam splitter prism, the reflection unit, the second beam splitter prism, M 2 Tester, spectrometer; The incident light output by the laser to be tested enters the first beam splitter prism, the first beam output by the first beam splitter prism enters the reflecting unit, the second beam output by the first beam splitter prism enters the second beam splitter prism, and the third beam output by the second beam splitter prism enters the M 2 Tester, the fourth light beam output by the second beam splitter prism enters the spectrometer; The reflecting unit is used to output reflected light to the first beam splitter prism, and the reflected light outputs a fifth light beam through the first beam splitter prism and enters the power detection module of the laser to be tested; The power detection module is used to detect the output power of the laser to be tested under the influence of the reflected light. 2 The tester is used to detect the beam quality of the laser to be tested under the influence of the reflected light, and the spectrometer is used to detect the spectrum of the laser to be tested under the influence of the reflected light.

2. The device for testing the change of indicators of a laser during actual use as claimed in claim 1, characterized in that: Also includes: A collimating lens, wherein the incident light output by the laser to be tested enters the first beam splitter prism through the collimating lens, and the fifth light beam enters the power detection module of the laser to be tested through the collimating lens.

3. The device for testing the change of indicators of a laser during actual use as claimed in claim 2, characterized in that: Also includes: The third light beam output by the second beam splitter prism enters the M through the focusing lens. 2 Tester.

4. The device for testing the change of indicators of a laser during actual use as claimed in claim 3, characterized in that: The laser to be tested comprises a temperature detection module, and the temperature detection module is used to detect the temperature of internal components of the laser to be tested.

5. The device for testing the change of indicators of a laser during actual use according to any one of claims 1 to 4, characterized in that: The reflection unit is made of fully inverted copper.

6. The device for testing the change of indicators of a laser during actual use as claimed in claim 5, characterized in that: The splitting ratio of the first beam splitter prism is one of the following: 90:10, 92:8, 95:5, and 97:

3.

7. A laser testing method, characterized in that: The following steps are involved: Connecting the laser to be tested to the device for testing the change of the indicator of the laser during actual use as claimed in any one of claims 1 to 6; Start the laser to be tested to output the incident light, collect the M 2 Test results of the tester, the spectrometer and the power detection module; The test result is compared with the preset test index to determine the test result.

8. The laser testing method according to claim 7, characterized in that: Before starting the laser to be tested to output the incident light, adjusting the splitting ratio of the first beam splitter prism according to the current simulated application scenario; Start the laser to be tested to output the incident light, collect the M 2 A first detection result of the tester, the spectrometer and the power detection module; Pause the output of the laser to be tested, and adjust the splitting ratio of the first beam splitter prism according to the next simulated application scenario; Start the laser to be tested to output the incident light, collect the M 2 A second detection result of the tester, the spectrometer and the power detection module; The first detection result and the second detection result are compared with a preset test index to determine a test result.

9. The laser testing method according to claim 8, characterized in that: The laser to be tested comprises a temperature detection module, and the temperature detection module is used to detect the temperature of the internal components of the laser to be tested; After adjusting the splitting ratio of the first beam splitter prism according to the current simulation application scenario, the laser to be tested is started to output incident light, and the M 2 First detection results of the tester, the spectrometer, the power detection module and the temperature detection module; After adjusting the splitting ratio of the first beam splitter prism according to the next simulated application scenario, the laser to be tested is started to output incident light, and the M 2 The second detection result of the tester, the spectrometer, the power detection module and the temperature detection module.

10. The laser testing method according to claim 9, characterized in that: When adjusting the light splitting ratio of the first light splitting prism according to the current simulated application scenario or the next simulated application scenario, the angle of the reflection unit is also adjusted.

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