High-power column vector fiber laser based on linear pseudolaser cavity

Abstract

The invention discloses a high-power column vector fiber laser based on a linear pseudolaser cavity. The high-power column vector fiber laser comprises a pumping source, a signal / pumping light beam combiner, a double-cladding ytterbium-doped fiber, a few-mode fiber carved with a raster, a first polarization controller and a second polarization controller. The output end of the pumping source is connected with the pumping input end of the signal / pumping light beam combiner, the few-mode fiber and the signal input end of the signal / pumping light beam combiner are welded in a staggered mode, a stagger point is formed at the welded position, the first polarization controller is arranged on a tail fiber of the few-mode raster on the left side of the staggered point, and the second polarization controller is arranged between the signal input end of the signal / pumping light beam combiner and the staggered point. The output end of the signal / pumping light beam combiner is connected with the double-cladding ytterbium-doped fiber, the output end of the double-cladding ytterbium-doped fiber is a vertical cutting end face and serves as a reflector, resonance is formed by the double-cladding ytterbium-doped fiber and the rasters, and therefore the linear pseudolaser cavity is formed. The high-power column vector fiber laser is simple in structure, high in output column vector laser power and good in polarization purity.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a high-power column vector fiber laser based on a linear pseudo-laser cavity. Background technique [0002] Cylindrical vector light is widely used in high-resolution microscopy imaging, electron acceleration, optical trapping, material processing and other fields due to its axisymmetric or rotationally symmetric polarization characteristics and the resulting intensity characteristics after tight focusing, attracting more and more people. much interest. The methods of generating cylindrical vector beams can be divided into active and passive methods. The active method usually uses an axial birefringent device in the laser cavity to force the laser to oscillate in the cylindrical vector mode; the passive method is to spatially uniformly polarize the light outside the laser cavity ( Such as linear polarization or circular polarization) into spatially non-uniformly polarized cylindrical...

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Problems solved by technology

A fiber laser based on a few-mode fiber Bragg grating is used to separate the fundamental mode and the higher-order mode, and it is also used to generate columnar vector light, but how to realize a high-power columnar vector fiber laser to obtain high-order mode columns with high polarization purity and good stability Vector light output remains a challenge

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