A laser parameter synchronous measurement system based on attenuation fixture

Abstract

This invention provides a laser parameter synchronous measurement system based on an attenuation fixture, including a beam collimator, a first reflecting mirror, a second reflecting mirror, a first beam splitter prism, a second beam splitter prism, a power meter, and an M... 2 The system includes a test instrument, a spectrum analyzer, a pulse width measurement module, and a spectrum analyzer; after the system is powered on and the laser under test outputs laser light, the power meter and M are simultaneously triggered. 2 The tester, spectrometer, pulse width measurement module, and spectrum analyzer are used to detect the laser parameters output by the laser under test. This invention can simultaneously measure parameters such as laser power, beam quality, and pulse characteristics (repetition frequency, pulse width), avoiding errors introduced by step-by-step measurements. Through synchronous triggering and data acquisition, it ensures that all parameters are measured under the same time reference, making it particularly suitable for dynamic laser systems or pulsed laser analysis. The integrated software can automatically integrate key parameters (such as peak power, average power, pulse width spectrum, etc.) and generate a laser parameter test report.

Description

Technical Field

[0001] This utility model relates to the field of laser measurement technology, and more specifically, to a synchronous measurement system for laser parameters based on attenuation fixtures, which is suitable for the research, development, production and quality inspection of high-power fiber lasers. Background Technology

[0002] Currently, with the rapid development of lasers, their power output can reach hundreds or even kilowatts. However, when testing laser output parameters, the required input power for various testing instruments is relatively low. Using direct laser output for testing carries the risk of damaging the measuring instruments. Furthermore, current individual laser parameter measuring devices have relatively limited functionality, such as power meters, energy meters, and beam quality analyzers (M). 2 Instruments such as laser power attenuators (APCs) can only test a single indicator. These laser parameters require step-by-step measurement using these devices, making it impossible to measure multiple parameters simultaneously. This results in a cumbersome and time-consuming measurement process, leading to low efficiency and failing to meet the rapid testing needs of production lines. For fiber laser output ports, frequent plugging and unplugging of the APC head is required when changing devices to test various laser parameters, which may cause wear on the APC head and further affect the measurement results. Therefore, finding a method and tooling that combines laser power attenuation with convenient and efficient measurement is extremely important. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a synchronous measurement system for laser parameters based on attenuation fixtures, overcoming the cumbersome nature of existing systems that can only measure a single index parameter of the laser.

[0004] This utility model provides a synchronous measurement system for laser parameters based on an attenuation fixture, including a laser under test, an attenuation fixture, and testing equipment. The attenuation fixture includes a beam collimator, a first reflecting mirror, a second reflecting mirror, a first beam splitter prism, and a second beam splitter prism. The testing equipment includes a power meter, an M2 tester, a spectrum analyzer, a pulse width measurement module, and a spectrum analyzer.

[0005] The APC head of the output fiber of the laser under test is inserted into the flange connector of the beam collimator. The laser signal output by the laser under test is collimated by the beam collimator and then passes through the first reflector. A portion of the laser is transmitted through the first reflector to form the first transmitted light. The first transmitted light then passes through the first beam splitter and is split into two laser beams, which are output to the spectrum analyzer and the pulse width measurement module, respectively.

[0006] The laser output from the laser under test passes through the first reflector, and another part of the light is reflected by the first reflector to form a first reflected light that is incident on the second reflector. A part of the first reflected light is transmitted through the second reflector to form a second transmitted light, which is output to the power meter. Another part of the first reflected light is reflected by the second reflector to form a second reflected light, which is then passed through the second beam splitter and split into two laser beams, which are output to the M2 tester and the spectrum analyzer, respectively.

[0007] After the system is powered on and the laser under test outputs laser light, the power meter and M are simultaneously triggered. 2 The tester, spectrum analyzer, pulse width measurement module, and spectrum analyzer detect the laser parameters output by the laser under test, integrate the detected laser parameters, and generate a laser test report.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Optionally, the lens of the first reflector is coated with a special film system, the special film system being consistent with the wavelength of the output laser signal of the laser under test, the first reflector having partial reflection and partial transmission functions, and the ratio of reflectivity to transmittance of the first reflector being 99:1.

[0010] Optionally, the lens of the second reflector is coated with a special film system, the special film system being consistent with the wavelength of the output laser signal of the laser under test, the second reflector having partial reflection and partial transmission functions, and the ratio of reflectivity to transmittance of the second reflector being 1:99.

[0011] Optionally, the beam splitting ratio of the first beam splitter prism and the second beam splitter prism is 50:50.

[0012] Optionally, the spectral analyzer has a scanning width of 10 nm, a resolution of 0.02 nm, and a center wavelength that is consistent with the laser wavelength output by the laser under test, both being 1064 nm, used to test the spectral parameters of the laser signal output by the laser under test.

[0013] Optionally, the pulse width measurement module includes a photodetector and an oscilloscope. The bandwidth of the pulse width measurement module is 1 GHz, and it is used to measure the time domain width of the laser pulse output by the laser under test.

[0014] Optionally, the power meter is used to monitor the laser power of the laser signal output by the laser under test, and the measurement accuracy of the power meter is matched with the output laser power of the laser under test.

[0015] Optionally, the M 2The tester is used to monitor the quality parameters of the laser signal output by the laser under test, and the spectrum analyzer is used to monitor the spectral parameters of the laser signal output by the laser under test.

[0016] This utility model provides a synchronous measurement system for laser parameters based on an attenuation fixture. After the system is powered on and the laser under test outputs laser light, the power meter and M... 2 The tester, spectrum analyzer, pulse width measurement module, and spectrum analyzer are used to detect the laser parameters output by the laser under test. This invention can simultaneously measure the laser power and beam quality (M). 2 The system integrates parameters such as factors and pulse characteristics (repetition frequency, pulse width) to avoid errors introduced by step-by-step measurements. Through synchronous triggering and data acquisition, it ensures that all parameters are measured under the same time reference, which is especially suitable for dynamic laser systems or pulsed laser analysis. The integrated software can automatically integrate key parameters (such as peak power, average power, pulse width spectrum, etc.) to generate a laser parameter test report. Attached Figure Description

[0017] Figure 1 A block diagram of a laser parameter synchronization measurement system based on an attenuation fixture, provided as an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the attenuation and signal light transmission in the test module of a laser parameter synchronous measurement system based on an attenuation fixture, according to an embodiment of the present invention.

[0019] The names of the labels in the attached diagram are as follows:

[0020] 1. Laser under test; 2. Collimating lens; 3. First reflecting mirror; 4. First beam splitter prism; 5. Second reflecting mirror; 6. Second beam splitter prism; 7. Spectrum analyzer; 8. Second pulse test module; 9. Spectrum analyzer; 10. Power meter; 11. M 2 12. Testing equipment, data integration equipment. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In addition, the technical features of the various embodiments or individual embodiments provided by this utility model can be arbitrarily combined to form feasible technical solutions. Such combinations are not bound by the order of steps and / or structural composition patterns, but must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] Figure 1 This invention provides a laser parameter synchronization measurement system based on an attenuation fixture, as one embodiment of the present invention. Figure 1 As shown, the synchronous measurement system for laser parameters includes a laser under test 1, an attenuation fixture, and testing equipment. The attenuation fixture includes a collimating lens 2, a first reflecting mirror 3, a second reflecting mirror 5, a first beam splitter prism 4, and a second beam splitter prism 6. The testing equipment includes a power meter 10, an M2 tester 11, a spectrum analyzer 7, a pulse width measurement module 8, and a spectrum analyzer 9.

[0023] The working principle of this laser parameter synchronous measurement system is as follows:

[0024] The output fiber APC head of the laser under test 1 is inserted into the flange connector of the collimating lens 2. The laser signal output by the laser under test 1 is collimated by the collimating lens 2 and then passes through the first reflecting mirror 3. A portion of the laser is transmitted through the first reflecting mirror 3 to form the first transmitted light. The first transmitted light then passes through the first beam splitter prism 4 and is split into two laser beams, which are output to the spectrum analyzer 7 and the pulse width measurement module 8, respectively.

[0025] The laser light output from the laser under test 1 passes through the first reflector 3, and another portion of the light is reflected by the first reflector 3 to form a first reflected light that is incident on the second reflector 5. A portion of the first reflected light is transmitted through the second reflector 5 to form a second transmitted light, which is output to the power meter 10. The other portion of the first reflected light is reflected by the second reflector 5 to form a second reflected light, which is then passed through the second beam splitter 6 and split into two laser beams, which are output to M respectively. 2 In the tester 11 and the spectrum analyzer 9.

[0026] After the system is powered on and the laser under test 1 outputs laser light, the power meter 10 and M are simultaneously triggered. 2 The tester 11, the spectrum analyzer 7, the pulse width measurement module 8, and the spectrum analyzer 9 detect the laser parameters output by the laser under test 1. The data integration device 12 integrates the detected laser parameters and generates a laser test report.

[0027] The first reflecting mirror 3 has a special film coating that matches the wavelength of the output signal light of the test laser and has partial reflection and partial transmission effects on the signal laser.

[0028] The lens of the second reflecting mirror 5 has a special coating. This coating has the same wavelength as the output signal light of the test laser and has a partial reflection and partial transmission effect on the signal laser.

[0029] The first beam splitter prism 4 and the second beam splitter prism 4 have a beam splitting function, and have a certain proportion of beam splitting function for the signal laser, so that it is output in different directions.

[0030] In the laser parameter synchronous measurement system, the pulse width measurement module 8 includes a photodetector and an oscilloscope. The pulse width measurement module 8 has a bandwidth of 1 GHz and is used to measure the time-domain width of the laser pulse output by the laser under test 1. The power meter 10 is used to monitor the laser power of the laser signal output by the laser under test 1. 2 The tester 11 is used to monitor the quality parameters of the laser signal output by the laser under test 1, the spectrum analyzer 9 is used to monitor the spectrum parameters of the laser signal output by the laser under test 1, and the spectrum analyzer 7 is used to monitor the spectrum parameters of the laser signal output by the laser under test 1.

[0031] See Figure 2 This diagram illustrates the attenuation of the laser parameter synchronous measurement system during laser parameter testing and the signal light transmission in the test module.

[0032] The laser parameter synchronous measurement system includes the laser under test (1), attenuation fixture, testing equipment, and data integration equipment. For example... Figure 1 and Figure 2 The specific structure within this attenuation fixture includes a collimating lens 2, a first reflecting mirror 3, a first beam splitter prism 4, a second reflecting mirror 5, and a second beam splitter prism 6. The testing equipment includes a spectrum analyzer 7, a pulse width testing module 8, a spectrum analyzer 9, a power meter 10, and an M... 2Test instrument 11. The pulse width testing module 8 includes a photodetector and an oscilloscope, with a bandwidth set to 1 GHz. An AQ3670D spectrometer 7 is selected, with a scan width of 10 nm, a resolution of 0.02 nm, and a center wavelength of 1064 nm, consistent with the laser under test. The power meter 10 is a Thorlabs unit, with power measured in W. After the test equipment is properly configured, pulse width and spectral parameters are acquired. Finally, the acquired data is integrated into a test report on the data integration device 12.

[0033] The output fiber APC head of the laser under test 1 is inserted into the flange connector of the collimating lens 2. After collimation by the collimating lens 2, the laser passes through the first reflecting mirror 3, whose reflectivity to transmittance ratio is 99:1. At this point, 1% of the transmitted laser light that passes through the first reflecting mirror 3 passes through the first beam splitter prism 4, whose reflectivity to transmittance ratio is 50:50. This portion of the laser light is then split into two beams, which are output to the spectrum analyzer 7 and the pulse width measurement module 8, respectively, to obtain the spectral data and waveform pulse width data of the laser under test. The measured pulse width of the laser is 105.2 ns, the repetition rate is 10 kHz, and the spectral SMSR is 60.2 dB. After obtaining these data and images, the data is transmitted to the data integration device 12 to await the generation of the test report.

[0034] At this point, the remaining 99% of the reflected laser light is reflected by the first reflector 3 to the second reflector 5. The reflectivity to transmittance ratio of the second reflector 5 is 1:99. Then, 1% of the laser light that has been transmitted through the second reflector 5 passes through the second beam splitter prism 6. The reflectivity to transmittance ratio of the second beam splitter prism 6 is 50:50. This portion of the laser light is then split into two beams again by the second beam splitter prism 6, and these beams are output to M respectively. 2 The M values ​​of the test laser were obtained from the test instrument 11 and the spectrum analyzer 9, respectively. 2 Based on the test conditions and other parameters such as line width, the laser M was tested and obtained. 2 The value is 1.12, and the linewidth is 1.9kHz.

[0035] At this point, the remaining 99% of the reflected laser light is reflected by the second reflector 5 and output to the power meter 10. Based on the obtained power or energy, the actual output power or energy of the laser under test can be calculated, and the output power of the laser can be estimated to be around 4.0W. After the output fiber APC head of the laser under test 1 is inserted into the attenuation fixture, the system is powered on, the data acquisition equipment is connected to each test device, and after the laser outputs laser light, the data measured by each test device will be collected and integrated to automatically generate a laser test report.

[0036] This invention provides a synchronous measurement system for laser parameters. After the system is powered on and the laser under test outputs laser light, it simultaneously triggers the power meter and M... 2 The tester, spectrometer, pulse width measurement module, and spectrum analyzer are used to detect the laser parameters output by the laser under test. This invention can simultaneously measure laser power, beam quality (M² factor), pulse characteristics (repetition frequency, pulse width), and other parameters, avoiding errors introduced by step-by-step measurements. Through synchronous triggering and data acquisition, it ensures that all parameters are measured under the same time reference, making it particularly suitable for dynamic laser systems or pulsed laser analysis. The integrated software can automatically integrate key parameters (such as peak power, average power, pulse width spectrum, etc.) and generate a laser parameter test report.

[0037] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0038] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0039] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A laser parameter synchronous measurement system based on an attenuation fixture, characterized in that, The system includes a laser under test, an attenuation fixture, and testing equipment. The attenuation fixture includes a beam collimator, a first reflecting mirror, a second reflecting mirror, a first beam splitter, and a second beam splitter. The testing equipment includes a power meter, an M2 meter, a spectrum analyzer, a pulse width measurement module, and a spectrum analyzer. The APC head of the output fiber of the laser under test is inserted into the flange connector of the beam collimator. The laser signal output by the laser under test is collimated by the beam collimator and then passes through the first reflector. A portion of the laser is transmitted through the first reflector to form the first transmitted light. The first transmitted light then passes through the first beam splitter and is split into two laser beams, which are output to the spectrum analyzer and the pulse width measurement module, respectively. The laser output from the laser under test passes through the first reflector, and another part of the light is reflected by the first reflector to form a first reflected light that is incident on the second reflector. A part of the first reflected light is transmitted through the second reflector to form a second transmitted light, which is output to the power meter. Another part of the first reflected light is reflected by the second reflector to form a second reflected light, which is then passed through the second beam splitter and split into two laser beams, which are output to the M2 tester and the spectrum analyzer, respectively. After the system is powered on and the laser under test outputs laser light, the power meter and M are simultaneously triggered. 2 The tester, spectrum analyzer, pulse width measurement module, and spectrum analyzer detect the laser parameters output by the laser under test, integrate the detected laser parameters, and generate a laser test report.

2. The laser parameter synchronous measurement system according to claim 1, characterized in that, The first reflector has a special film coating on its lens, which is consistent with the wavelength of the output laser signal of the laser under test. The first reflector has partial reflection and partial transmission functions, and the ratio of reflectivity to transmittance of the first reflector is 99:

1.

3. The laser parameter synchronous measurement system according to claim 1, characterized in that, The second reflector has a special film coating on its lens, which is consistent with the wavelength of the output laser signal of the laser under test. The second reflector has partial reflection and partial transmission functions, and the ratio of reflectivity to transmittance of the second reflector is 1:

99.

4. The laser parameter synchronous measurement system according to claim 1, characterized in that, The beam splitting ratio of the first beam splitter prism and the second beam splitter prism is 50:

50.

5. The laser parameter synchronous measurement system according to claim 1, characterized in that, The spectral analyzer has a scanning width of 10 nm, a resolution of 0.02 nm, and a center wavelength that is consistent with the laser wavelength output by the laser under test, both being 1064 nm. It is used to test the spectral parameters of the laser signal output by the laser under test.

6. The laser parameter synchronous measurement system according to claim 1, characterized in that, The pulse width measurement module includes a photodetector and an oscilloscope. The bandwidth of the pulse width measurement module is 1 GHz, and it is used to measure the time domain width of the laser pulse output by the laser under test.

7. The laser parameter synchronous measurement system according to claim 1, characterized in that, The power meter is used to monitor the laser power of the laser signal output by the laser under test.

8. The laser parameter synchronous measurement system according to claim 1, characterized in that, The M 2 The tester is used to monitor the quality parameters of the laser signal output by the laser under test, and the spectrum analyzer is used to monitor the spectral parameters of the laser signal output by the laser under test.

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