3 mium fiber laser based on doped fluoride phase shift grating feedback

Abstract

The invention discloses a 3 mium fiber laser based on doped fluoride phase shift grating feedback, and belongs to the technical field of fiber lasers. The 3 mium fiber laser based on doped fluoride phase shift grating feedback is composed of an LD pumping laser source set, a fiber combiner, an optical isolator, a fiber grating, a first highly-germanium-doped fiber, a second highly-germanium-dopedfiber and a double-cladding Ho3+ fluoride fiber engraved with a random phase shift grating. According to the invention, the random phase shift grating is engraved on the double-cladding Ho3+ fluoridefiber, pumping light is absorbed by Ho3+ through a pumping source laser pump, stimulated radiation is generated, and when an output laser threshold value is reached, random laser output is generated;the pumping laser is reflected by the fiber grating to oscillate back and forth, pumping threshold power can be effectively reduced, pumping efficiency is improved, and the laser has the advantages ofbeing low in threshold power, high in conversion efficiency, compact in structure, capable of achieving all-fiber and the like.

Description

technical field [0001] The invention relates to a random fiber laser, in particular to a 3 μm fiber laser based on doped fluoride phase-shift grating feedback, and belongs to the technical field of fiber lasers. Background technique [0002] Random fiber laser is a new type of fiber laser. Unlike traditional lasers, it uses multiple scattering of disordered gain media to form coherent light. It does not have a general resonant cavity. It has no mirrors in its structure, and the feedback of light passes through the fiber It is realized by random feedback, and the interference effect of scattered light is used to generate a resonance mode of a specific frequency to realize random laser output. The lasing principle is based on random distribution Rayleigh scattering and Raman amplification effect. However, the Rayleigh scattering that forms the feedback is weak, and this kind of random fiber laser often needs a long-distance fiber (tens of kilometers) to meet the requirements o...

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Problems solved by technology

However, the Rayleigh scattering that forms the feedback is weak, and this kind of random fiber laser often needs a long-distance fiber (tens of kilometers) to meet the requirements of the working length of the gain medium and the feedback medium, and has high threshold power and low conversion efficiency.

At present, the random laser output wavelength has just begun to develop from the optical communication wavelength of 1.0-1.5 μm to the 2 μm wavelength, while the mid-infrared random fiber laser in the 3 μm band has not yet

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