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

A phase-shift grating, fluoride technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of lack of infrared random fiber lasers, low conversion efficiency, high threshold power, and improve utilization and conversion efficiency. , the effect of shortening the fiber length and reducing the laser threshold power

CN110048296APending Publication Date: 2019-07-23CHINA JILIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-07-23

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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.
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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...

Examples

Embodiment

[0019] figure 1 It is a structural schematic diagram of a 3 μm fiber laser based on doped fluoride phase-shift grating feedback in the present invention. Among them, the laser wavelength of the LD pump laser source group 1 is 1150nm, the fiber combiner 2 is (6+1)×1, the working wavelength is 1150nm / 2860nm, and the center wavelength of the optical isolator 3 is 1150nm. The concentration of the first highly germanium-doped optical fiber 4 and the second highly germanium-doped optical fiber 7 is 75wt.%, and the length is 10cm. Double-clad Ho-doped 3+ The fluoride optical fiber 5 is 2m in length, the random phase shift grating 6 is doped with Ho in the double cladding 3+ Write on the fluoride optical fiber 5, the reflectivity is 50%-95%, and the length is 5cm. The fiber grating 8 is written by high germanium-doped fiber, the length is 2cm, the reflectivity is 95%-99%, and the center wavelength is 1150nm. The LD pump laser source group 1 is connected to one end of the fiber com...