Fractal-based coherent optical fiber laser array and generation system thereof

Abstract

Disclosed are a fractal-based coherent optical fiber laser array and a generation system thereof. The coherent optical fiber laser array comprises N circles of light beams annularly arranged around the center of an array optical fiber from inside to outside, each circle of light beams comprises the same number of sub-light beams, and the sub-light beams in the same circle of light beams have the same optical parameters and are uniformly arranged in the angular direction. At least two or more continuous circles of light beams in the N circles of light beams form a fractal arrangement laser array; any two adjacent circles of light beams in the fractal arrangement laser array are separated from each other; and the beam waist radius, the beam caliber and the distance between the beam center and the center of the array optical fiber of each sub-beam in the circle of light beams close to the inner side are reduced in an equal ratio relative to the beam waist radius, the beam caliber and thedistance between the beam center and the center of the array optical fiber of each sub-beam in the circle of light beams close to the outer side. According to the invention, the array filling mode ofthe system can be expanded, and the optical parameter regulation and control capability of the laser array is improved, so that the synthesis efficiency and mode purity of structured light generated by the coherent optical fiber laser array are improved.

Description

technical field [0001] The invention relates to the technical field of fiber laser coherent combination, in particular to a fractal-based coherent fiber laser array and a generation system thereof. Background technique [0002] Fiber laser coherent combination is one of the important methods to obtain high-brightness laser coherent combination. It has broad application prospects in space optical communication, scientific research, national defense and other fields, and is a research hotspot in the field of laser technology. Fiber laser coherent combining is an effective way to achieve high average power and high beam quality laser output, and has broad application prospects in medical and health care, industrial processing, scientific research, and national defense security. In recent years, with the rapid development of laser technology, not only high-power lasers are needed in the fields of long-distance space optical communication, nonlinear frequency conversion, laser ab...

AI Technical Summary

Problems solved by technology

[0004] However, the existing array beam construction method limits the filling method of the array beam in the traditional coherent combination field, which makes it difficult to further eliminate the side lobes of the combined beam, thus affecting the improvement of the energy concentration of the combined beam

This problem is more obvious in the field of high-power structured light generated by fiber laser arrays, such as vortex beams. The existing array beam construction methods make it difficult to further eliminate the side lobes of the combined beams, which not only affects the limited power improvement, but also affects the generation. Mode purity of vortex beams

Therefore, the existing array beam construction method brings difficulties to the further optimization of the fiber laser array coherent combining system

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