Coherent laser synthesis system

Abstract

The invention discloses a coherent laser synthesis system, which comprises a laser source and a lens array, and is characterized in that the lens array comprises a plurality of lenses, and the lenses are arranged according to a preset non-equal-period non-uniform spatial density Fermat spiral array, wherein the laser source is used for generating a plurality of laser beams, the laser beams meet coherence conditions, and the plurality of laser beams are in one-to-one correspondence with the plurality of lenses; and the lens is used for receiving the multiple laser beams and collimating the multiple laser beams, so that the laser beams emitted by the lens are coherently superposed in a far field to obtain a combined beam. According to the invention, the lenses are arranged according to the Fermat spiral array with non-equal period and non-uniform space density, so that the lens array is arranged in a manner of compact center and sparse edge, and the sidelobe intensity of the coherent combination far field is weakened while the power ratio in the barrel of the coherent combination far field is improved.

Description

technical field [0001] The invention belongs to the technical field of coherent lasers, and in particular relates to a coherent laser synthesis system. Background technique [0002] Continuously obtaining high-power, high-beam-quality laser output has always been the goal of national defense, industry and other fields. Fiber lasers have many advantages such as high output beam quality, high power, and compact structure. However, due to factors such as nonlinear effects, thermal effects, and mode instability, the output optical power or energy of a single fiber laser is limited. [0003] In order to obtain a laser with higher power and higher beam quality, it is necessary to obtain a higher power and better beam quality laser output through coherent combination of multiple lasers. In the array fiber laser coherent combination technology, the aperture of the multi-channel fiber laser The filling method is especially important. At present, the aperture-filling array commonly ...

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Problems solved by technology

[0004] However, the regular hexagonal array arrangement with equal periodic distribution above will make the far-field output of the array laser coherently combined have side lobes that are easily detected, that is, the energy of the array laser will be partially dispersed to the side lobes, which is not conducive to improving the concentration in the far field. The proportion of energy within the main lobe of the field reduces the quality of the laser beam

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