An upconversion single-frequency blue-green light fiber laser

Abstract

The invention discloses an upconversion single-frequency blue-green optical fiber laser, which comprises a broadband optical fiber Bragg grating, a highly doped fluoride optical fiber, a narrow-band optical fiber Bragg grating, a resonant cavity temperature control module, a wavelength division multiplexer, a pump source and an optical isolator. High-doped fluoride fiber is used as laser gain medium, which is connected with broadband fiber Bragg grating and narrow-band fiber Bragg grating respectively to form single-frequency laser short cavity. Combined with the upconversion luminescence process of high-doped fluoride fiber, the single-frequency blue-green fiber laser output is realized from the resonant cavity. Compared with the traditional semiconductor blue-green laser and the blue-green laser obtained by nonlinear frequency conversion, The invention has the advantages of all optical fiber connection, simple structure, easy maintenance, low cost and high stability, and can be usedfor laser display, underwater communication and optical data storage, and has important application value in the fields of atomic detection, laser spectroscopy, biomedical treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, in particular to a single-frequency blue-green fiber laser with a short-line cavity structure. Background technique [0002] Visible light lasers, especially single-frequency blue-green lasers, have important application value in coherent light detection, optical data storage, laser display, biological and medical diagnosis and other fields. At present, there are three commonly used methods to obtain blue-green laser: (1) use infrared band laser as the fundamental frequency light source, and obtain blue-green laser through nonlinear frequency conversion process; (2) use gallium nitride and zinc selenide After the blue-green semiconductor laser undergoes beam shaping, it outputs blue-green laser; (3) uses fluoride fiber or crystal as the laser up-conversion gain medium, and directly outputs blue-green laser under the pumping source. [0003] However, for the nonlinear frequency conversion pr...

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Problems solved by technology

However, the blue-green laser required by the above-mentioned patents does not have typical characteristics such as single longitudinal mode (single frequency) operation and full fiber optics.

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