Method and system for generating vector beams and realizing customization of focal field
A beam and vector technology, applied in optics, optical components, instruments, etc., can solve the problems of nonlinear effect of output power, low conversion efficiency, mode instability, etc., achieve high conversion efficiency, and realize the effect of flexible customization of focal field.
Active Publication Date: 2022-03-04
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
Among them, the complexity of the output mode of the active generation method is limited by the laser resonator; while the passive generation method requires large optical components and complex optical paths, and the output power is affected by nonlinear effects, mode instability and optical components. power, and its conversion efficiency is low
However, there are no related reports on the use of fiber laser coherent combining system to generate high output power columnar vector beams
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[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0043] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.
[0044] In addition, in t...
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The invention provides a method and system for generating vector beams and realizing focal field customization. The fiber laser array generation system is used to generate a fiber laser array, and a small part of the fiber laser array is collected for piston phase control; The polarization of each sub-beam is adjusted to make it a vector beam with a set polarization distribution; the vector beam is emitted after being tightly focused by a high numerical aperture lens, and the tightly focused field distribution of the vector beam near the focal plane is obtained; each sub-beam in the vector beam is changed The initial polarization azimuth and azimuth angle can change the tight focus field distribution of the vector beam near the focal plane, and realize the focal field customization of the vector beam. The invention is expected to obtain a high-power tightly focused vector light field, and realizes flexible control of the vector light beam focus field by controlling the polarization of each sub-beam.
Description
technical field [0001] The invention relates to the technical field of fiber laser coherent combining, in particular to a method and system for generating vector beams and realizing focal field customization. Background technique [0002] Polarization state is one of the important vector properties of light. Different from spatially uniformly polarized light beams (such as: linearly polarized light, circularly polarized light, elliptically polarized light), vector beams have a spatially non-uniform distribution. Among many vector beams, a beam with axisymmetric distribution of polarization state and hollow intensity distribution is called cylindrical vector beam. [0003] In recent years, cylindrical vector beams have attracted extensive attention from researchers at home and abroad due to their unique tight focusing characteristics. For example, a radially polarized vector beam produces an extremely strong axial light field compared to linearly polarized light, resulting ...
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IPC IPC(8): G02B27/28G02B27/00
CPCG02B27/286G02B27/0012
Inventor 周朴张雨秋侯天悦常琦常洪祥马鹏飞粟荣涛吴坚马阎星司磊许晓军陈金宝
Owner NAT UNIV OF DEFENSE TECH