based on tm 01 Method for generating vortex laser by mode light conversion and vortex laser

Abstract

The invention discloses a TM-based 01 The vortex laser generation method of mode light conversion, using the laser light emitted by the laser source to generate TM through the few-mode doped gain fiber 01 pattern light, and then utilize TM 01 Mode light passes through the optical axis perpendicular to the TM 01 The λ / 4 fiber wave plate in the incident direction of the mode light is converted into vortex light, and then the vortex laser output is formed through the resonance of the vortex light, which provides a new solution for the generation of vortex laser; in addition, the present invention is also based on the vortex laser generation method that provides a TM-based 01 Mode light conversion vortex laser design scheme, simple structure design, stable and reliable operation, can better take into account the low cost and operational reliability of vortex lasers, and can further control the optical path to achieve controllable selection of output lines Polarized vortex light or left-handed circularly polarized vortex light provides a new solution for outputting vortex lasers with different polarization states.

Description

Technical field [0001] The present invention relates to the field of fiber laser technology, particularly relates based TM 01 Swirl pattern converted laser light generating method, and a scroll method is based on the laser. Background technique [0002] In the optical communication system, the selection of the beam is particularly important, in the past it before the main beam having a uniform phase front or polarization uniformity. But in recent years, some of which have the form of polarization, optical fields at a specific amplitude or phase of people's attention, which is typically light beam as a column vector with vortex beams. [0003] Helical vortex beams having the phase distribution, the center of the annular hollow beam intensity is zero, the optical field distribution expression containing phase factor exp (± ilφ), wherein the azimuth angle φ, l is the topological charge. Orbital angular momentum mode, the number of different topological charges are orthogonal, is a n...

AI Technical Summary

Problems solved by technology

For example, the hologram method has extremely high requirements on the quality of the photosensitive grating sheet, so the low diffraction efficiency of the photosensitive sheet determines that the quality of the vortex beam produced by this method is not good

Computational holography can only generate low-order vortex beams in practical applications, and the generation efficiency is low. It cannot generate a single mode of vortex light

The spatial light modulator method, although flexible, cannot be used to generate high power vortex beams

The spiral phase plate method is not flexible enough, and there are also complex manufacturing processes, fixed output modes, and a single vortex light mode generated.

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