Laser light beam uniformity attenuator

Abstract

The invention provides a laser light beam uniformity attenuator. The laser light beam uniformity attenuator comprises an attenuation chamber; the attenuation chamber is a hollow seal chamber, diffusereflection surface treatment is applied on the inner wall of the attenuation chamber, and thus a diffuse reflection layer is formed; a sampling in-emit hole and out-emit hole are coaxially formed in the attenuator relative to the two ends, a transmission body capable of highly transmitting a laser light is fixed to the end, close to the out-emit hole, of the inner part of the attenuation chamber,a diffuse reflection film applying high reflectance to the laser light is arranged on the position, directly opposite to the sampling in-emit hole, on the surface of the transmission body, and the diameter of the diffuse reflection film is larger than the diameter of the sampling in-emit hole. The laser light beam uniformity attenuator has characteristics that the structure is compact, processingis convenient, and attenuation coefficient uniformity of different attenuators is good, and the problems that the spatial size of a traditional integrating sphere body is large, and laser light parameter measuring of high spatial resolution cannot be achieved when a two-dimensional array is configured are solved.

Description

technical field [0001] The invention relates to a high-energy laser beam homogenization attenuator, in particular to a high-power laser power density large multiple quantitative attenuation sampler. Background technique [0002] In the measurement of high-energy laser parameters, it is necessary to obtain the spatiotemporal distribution of laser light intensity. Since the laser power density at the test position is generally high, reasonable attenuation is required to detect it with a photodetector array arranged in an area array. [0003] At present, the commonly used optical attenuation methods mainly include the filter attenuation method and the integrating sphere attenuation method, that is, an optical attenuator is added in front of each detector to attenuate the power of the laser to within the detectable range of the detector. Because the attenuation coefficient of the filter is difficult to accurately calibrate when the filter is attenuated by a large multiple, the r...

AI Technical Summary

Problems solved by technology

The disadvantage of the above-mentioned integrating sphere structure attenuator is that since the integrating sphere attenuator has an asymmetric structure, the sampling entrance hole and the exit hole are located on both sides of the integrating sphere. Large-angle laser attenuation can only be achieved with an included angle between positions, and the attenuator adopts a spherical or hemispherical shape, and the structure is not compact, so it is difficult to meet the attenuation requirements of high spatial resolution array detection

[0005] Authorized patent ZL 201410279528.7 discloses an attenuation sampling device for high-energy laser incident at a large angle, including a straight sampling hole, an exit hole and a cylindrical cavity. The cylindrical cavity is filled with granular optical body scattering materials, which can realize Large-angle attenuation sampling, but the problem is that when filling the cavity with optical body scattering material, the filling density is prone to inconsistency, resulting in a large difference in the attenuation coefficients of different attenuators on the same measurement target board, which affects the consistency of laser measurement. sex

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