Light beam quality evaluation method based on vortex light beams generated by fiber laser array

A vortex beam and fiber laser technology, applied in optics, optical components, instruments, etc., can solve the problems of inapplicability, difficulty in reflecting the mode purity, unsuitable beam quality evaluation method, etc., and achieve the effect of mature measurement technology and convenient application
CN112180591AActive Publication Date: 2021-01-05NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2021-01-05

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Abstract

A light beam quality evaluation method based on vortex light beams generated by an optical fiber laser array comprises the following steps: generating vortex light beams with topological charges m based on the optical fiber laser array, and obtaining light intensity distribution of target plane synthetic vortex light beams at a distance z = L from an emitting surface; obtaining m-order orbital angular momentum mode purity in a circular domain of the target plane synthetic vortex light beam at the distance of z = L from the emitting surface; calculating a high-order light beam transmission factor; and determining that when the closer the high-order light beam transmission factor is to 1, the better the light beam quality of the vortex light beam with the topological charge number of m generated based on the fiber laser array is. The high-order light beam transmission factor can effectively describe the energy concentration degree of the synthesized vortex light beam, considers the modepurity of the synthesized vortex light beam, and can accurately evaluate the light beam quality of the synthesized vortex light beam.
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Description

technical field

[0001] The invention belongs to the technical field of fiber laser quality evaluation, and in particular relates to a beam quality evaluation method based on a fiber laser array generating vortex beams. Background technique

[0002] Beam quality is an extremely important parameter in the application of laser technology and a performance index for evaluating laser characteristics. It is of great significance to guide the design, manufacture, detection and application of lasers and laser systems. Coherent combination of fiber laser array is one of the important methods to obtain high-brightness laser. It has broad application prospects in the fields of medical health, industrial processing, scientific research and national defense security. At present, there are many methods for coherent combination of fiber laser array to generate The beam quality of the beam is evaluated, such as M2 factor, Strehl ratio, power in the barrel, beam propagation factor (BPF), etc...

Claims

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