Unstable resonator automatic cavity-adjusting system and method using self-collimation feedback light path

Abstract

The invention discloses an instable chamber automatic chamber adjusting system based on auto-collimating feedback optical path, and a relative adjusting method, for using an aberration detecting system, an instable chamber, and a feedback mirror to build an auto-collimating system for automatically adjusting instable chamber. The invention uses the aberration detecting system to obtain the optical aberration of reflected beam, according to Zernike aberration factors and system sensitivity matrix to calculate out the position bias of chamber mirror, thereby outputting a drive signal according to the position bias, to correct the position bias. The invention has the advantages that (1), the invention can detect the high-order aberration of chamber adjusting signal light, to make instable chamber adjustment more stable and accurate, (2), the invention can calculate the position bias of chamber mirror according to aberration directly, to adjust the instable chamber with fewer operation and high speed.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to an unstable cavity automatic cavity adjustment system and a cavity adjustment method. Background technique [0002] The unstable cavity is the key device to realize laser energy extraction and output in high-energy lasers. Whether the collimation of the unstable cavity will directly affect the output beam quality and output power stability of the laser, so the laser must be checked during installation or operation. The adjustment of the resonant cavity mirror makes the position of the cavity mirror meet the design requirements to achieve the predetermined output index. [0003] At present, the cavity adjustment method of the unstable cavity of the high-energy laser generally adopts the Gaussian beam output by the He-Ne laser 22 as the guiding light (as shown in FIG. 1 ) and injects it into the unstable cavity through the small hole on the concave mirror 23, guiding In the resonan...

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Problems solved by technology

[0004] (1) The spot on the focal plane is a multi-beam interference fringe formed by superposition of multiple beams. The distribution of the light field is complex, and the aberration of the output beam cannot be quantitatively judged. Only the tilt information of the output beam of the unstable cavity can be obtained. High-order aberrations such as spherical aberration and coma cannot be judged, so the tuning accuracy is not high;

[0005] (2) It is necessary to judge which mirror positions are offset based on experience, and multiple mirrors need to be adjusted repeatedly, so the adjustment is cumbersome and the adjustment speed is slow

[0006] (3) The method of opening small holes on the concave mirror not only increases the difficulty of mirror processing and the risk of thermal damage to the mirror, but also destroys the formation of the Fresnel diffraction nucleus of the unstable cavity, which is not conducive to the quality of the output beam of the unstable cavity improve

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