High-energy laser homogenizing cavity attenuator

Abstract

The invention discloses a high-energy laser homogenizing cavity attenuator which comprises a front panel, a small-hole sample plate, an attenuation plate, an output panel and a plurality of scattering attenuation units. Each attenuation unit includes a large-angle sampling taper hole arranged on the small-hole sample plate, a homogenizing cavity and a light transmission channel which are arranged on the attenuation plate, and a homogenizing cavity and a laser output hole which are arranged on the output panel, wherein the light transmission channel is of a circular symmetric structure, which enables the angle characteristic of the attenuator to have circular symmetry. The attenuator has a multi-layer plate structure, which can effectively reduce the influence of high temperature generated due to long-time irradiation of high-energy laser on the front panel to a subsequent measurement unit. According to the attenuator of the invention, laser is output from the output hole after being homogenized for multiple times, substantial attenuation of the laser power density is achieved, and the attenuator has better attenuation angle characteristics.

Description

technical field [0001] The invention relates to an attenuator for high-energy laser beams, in particular to an array attenuator for measuring high-energy laser beams. 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 it is attenuated by a large multiple, and the power meter for calibration is high, ...

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 entrance hole and the exit hole are located on both sides of the integrating sphere. In order to achieve large-angle laser attenuation, and the incident angle of the laser that can be attenuated is limited; in addition, in order to achieve a larger multiple of light intensity attenuation, it is difficult to achieve a smaller size of the integrating sphere, which limits the use of array attenuators in high spatial resolution laser Application in Beam Parameter Measurement

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