Measuring device and testing method for measuring beam divergence angle and laser quality factor
A technology for measuring light beams and quality factors, applied in measuring devices, using optical devices, testing optical properties, etc., can solve the problems of complex measurement structure, high adjustment accuracy, and low test accuracy, and achieve accurate calculation methods, solve complexity, highly selective effect
Active Publication Date: 2021-08-10
NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE
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Problems solved by technology
[0004] In view of the existing beam divergence angle measurement technology, there are complex measurement structures, high adjustment accuracy and low test accuracy. The object of the present invention is to provide a measuring device for measuring beam divergence angle and laser quality factor, which is A portable and simple device and method for measuring beam divergence angle. For different beams to be measured, the beam divergence angle is measured by changing the corresponding measurement structure, and then the propagation parameter properties of the beam are obtained.
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Embodiment 1
[0045] Embodiment 1, based on the new device and test method of measuring beam divergence angle and laser quality factor, its device for measuring optical fiber focal ratio degradation (beam divergence angle) is as figure 1 As shown, the device for measuring the laser quality factor is as figure 2 shown. The basic device mainly includes an attenuation module 2, a spectroscopic element 3, a photosensitive element 4, a computer 5, an optical fiber 1 used for detecting the divergence angle of the optical fiber, and a lens 6 used for detecting the laser quality factor. Among them, the attenuation module 2 is mainly used to adjust the intensity of the light beam to be measured, the light splitting element 3 is mainly used to split the light beam to be measured into two or more light beams with known optical path differences, and the photosensitive device 4 is mainly used for the generated two beams. The computer 5 is mainly used to measure and calculate the radius of the light sp...
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Measuring device and testing method for measuring beam divergence angle and laser quality factor, a lens and an optical fiber to be tested are arranged on the optical path, and an attenuation module, a spectroscopic element, and a photosensitive element are sequentially arranged behind the lens on the optical path; the light spot output by the photosensitive element The image is connected to the computer. The attenuation module adopts attenuation sheets. The beam splitting element splits the beam to be measured into two or more beams with known optical path difference. The beam splitting element is a double beam splitting element composed of a three-dimensional beam splitting prism and a right-angle prism, or a rhomboid prism and a right-angle prism. A dual-beam beamsplitter is formed or a single laterally shifted beamsplitter. The invention effectively compensates for the complex defect of the optical path caused by the need to move the beam in the traditional beam measuring device, improves the testing accuracy, optimizes the design of the testing system, and can measure the pulse laser at the same time. The structure and the corresponding test method steps can be applied in related fields such as laser processing, detection and optical fiber quality detection.
Description
technical field [0001] The invention relates to a measuring device, in particular to a measuring device for measuring beam divergence angle and laser quality factor. It is mainly used in the performance measurement of freely propagating light sources such as lasers, diverging light or converging light, or the measurement based on the degradation of the focal ratio of optical fibers. Mainly by measuring the diameter or radius of the spot at different positions of the beam, the divergence angle of the spot is calculated and obtained, and then the propagation parameters of the beam are obtained according to the transmission properties of the beam. The structure is mainly used in the field of beam measurement and detection. The invention also relates to a method of testing such devices. Background technique [0002] The beam divergence angle refers to the degree to which the beam width or beam diameter increases with the increase of the beam propagation distance, reflecting th...
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IPC IPC(8): G01B11/26G01M11/02
Inventor 韩建肖东叶慧琪唐靓翟洋郝志博徐韦佳
Owner NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE