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

Active Publication Date: 2021-01-05
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, for the vortex beam produced by coherent combination of fiber laser array, the optical intensity on the axis is 0, and the light intensity distribution is ring-shaped. The mode purity is related to the helical phase structure of vortex beams, so BPF is not suitable as a beam quality evaluation method for vortex beams generated by fiber laser arrays

Method used

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

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Experimental program
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Embodiment 1

[0054] refer to figure 1 , the beam quality measurement system built for this embodiment can be used to measure some parameters that need to be used in the beam quality evaluation method based on the vortex beam generated by the fiber laser array.

[0055] Such as figure 1 As shown, the beam quality measurement system includes laser system 1, 4-f system 2, beam splitter 3, 1# optical power meter 4, spatial optical phase modulator 5 and 2# optical power meter for generating vortex beam by fiber laser array 6. 4-f system 2 includes 1# lens 201 , circular diaphragm 202 and 2# lens 203 . The laser system 1 that generates the vortex beam with the fiber laser array produces a vortex beam with a topological charge m that is spatially filtered by the 4-f system 2, and the output beam passes through the beam splitter 3, and the transmitted part of the beam is used to measure the vortex beam in the circular field Power ratio, reflected part of the beam is used to measure the power spe...

Embodiment 2

[0066] The second way to evaluate the beam quality of the target plane synthetic vortex beam, using numerical calculation, can be used for the optimal design of experimental system parameters. According to the numerical calculation to obtain the light intensity distribution I combined (ρ,ψ,,L), and then calculate the power ratio of the vortex beam in the circular domain.

[0067] Specifically, the beam quality evaluation method based on the fiber laser array to generate the vortex beam includes:

[0068] (1) Generate a vortex beam whose topological charge is m based on the fiber laser array, and obtain the light intensity distribution I of the synthetic vortex beam on the target plane at the distance z=L combined (ρ,ψ,L).

[0069] For a fiber laser array with a total aperture of D on the emitting surface, it is expected that the topological charge of the vortex beam generated is m, and the fiber laser array on the emitting surface is constructed as figure 2 As shown, its l...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G02B27/09
CPCG02B27/0012G02B27/0994G02B27/0927
Inventor 周朴侯天悦马鹏飞马阎星粟荣涛吴坚李灿刘伟姜曼张雨秋常琦常洪祥王涛张嵩司磊许晓军陈金宝
Owner NAT UNIV OF DEFENSE TECH
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