Coherent combining device of self-adaption high-order transverse mode lasers

Abstract

The invention relates to a coherent combining device of self-adaption high-order transverse mode lasers, which comprises a solid laser, a deformable mirror, a beam matching system, a CCD camera, a beam splitting reflector, a high-pressure amplifier, a focusing lens, an attenuation system and a computer. High-order transverse mode lasers output by the solid laser are irradiated to the deformable mirror after being expanded by the beam matching system; laser beams reflected by the deformable mirror are gathered on the CCD camera at a focal position after passing through the beam splitting reflector, the attenuation system and the focusing lens in sequence; an optimization algorithm placed in the computer iterates along the direction enabling the strength of the peak value of a focal spot on the CCD camera to work out a voltage signal; the voltage signal is loaded to each driver of the deformable mirror after being amplified by the high-pressure amplifier to drive the deformable mirror to generate corresponding deformation so as to compensate the distortion in the whole wavefront phases of the high-order transverse mode lasers, compensate the pi-phase step of sidelobes of both sides of each nodel line of the high-order transverse mode lasers and improve the coherent feature and the focusable capability of the high-order transverse mode lasers. The invention can improve the coherent performance and the focusable capability among high-order transverse mode beams.

Description

technical field [0001] The invention relates to a laser coherent combining device, in particular to a single laser coherent combining device which uses adaptive optics technology to improve the coherent characteristics of high-order transverse mode lasers. Background technique [0002] High power (>1kW) and high beam quality near the diffraction limit have been one of the main research and development directions of laser technology. In many laser application fields, people hope that the laser has high power, high beam quality and high focusing strength, especially in such fields as inertial confinement fusion, high energy density physics, precision laser processing, laser communication, biophoton research, laser coherence Fields such as synthesis require that the laser has a good mode and a high focusing power density. Compared with the high-order transverse mode beam, the fundamental mode beam has a smaller divergence angle, better beam quality and higher focusable powe...

AI Technical Summary

Problems solved by technology

The method based on multiple plane mirrors needs to design different optical paths for different modes. When applied to high-order transverse modes, multiple beamsplitters must be used to combine beams at the same time, so the optical path will become very complicated and the reliability will deteriorate; based on interference The method of device and transmissive phase device needs to design different devices for different modes of beams, which brings great inconvenience to the laser system

At the same time, these methods require the laser beam to be strictly aligned with the optical device, otherwise the method based on multiple plane mirrors and interference devices cannot achieve the equal sharing of the beam, and the method based on the transmission phase device cannot fully compensate for the jump of the π phase

In addition, it must be noted that these methods only compensate for the π phase jump on both sides of the high-order mode beam nodal line, and have not studied how to correct the spherical wavefront of the high-order transverse mode, nor can they correct the laser itself. The static and dynamic distortion caused by distortion and other factors are compensated, so although the approximate unimodal distribution of the focused spot can be achieved to a certain extent, the focused peak intensity has not been effectively improved

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