1.7mum all-optical-fiber thulium-doped quartz optical-fiber laser based on two-directional pumping structure

Abstract

The invention relates to an optical-fiber laser, in particular to a 1.7mum all-optical-fiber thulium-doped quartz optical-fiber laser based on a two-directional pumping structure. The 1.7mum all-optical-fiber thulium-doped quartz optical-fiber laser comprises a pumping source, an isolator and a laser resonance cavity, wherein the laser resonance cavity comprises an optical-fiber Bragg grating A, an optical-fiber Bragg grating B, an optical-fiber Bragg grating C, a wavelength division multiplexer and a thulium-doped quartz optical fiber. The 1.7mum all-optical-fiber thulium-doped quartz optical-fiber laser has the advantages that high-reflectivity optical-fiber grating at the wavelength position of the pumping source to reflect forward pumping light which cannot be completely absorbed back into the laser resonance cavity so as to form a simple and ingenious two-directional pumping structure. Due to the structure, the problem of low pumping-light absorbing efficiency caused by low doping concentration and short length of thulium-doped gain optical fiber can be effectively solved.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a 1.7 μm all-fiber thulium-doped quartz fiber laser based on a bidirectional pumping structure. Background technique [0002] The emission spectrum of thulium-doped quartz fiber laser can cover the 1.65-2.1 μm band, but the research on it is mainly concentrated around the 2-micron band. In recent years, with the application of the 1.7 micron wave band being developed, people have gradually increased the research on the short wavelength region (1.65-1.75 μm) of thulium-doped silica fiber lasers. However, the reabsorption of short-wavelength signal light in the quasi-three-level system and the gain saturation effect at short wavelengths easily caused by ASE at the central wavelength of the fluorescence seriously hinder the short-wavelength laser output of thulium-doped silica fiber lasers. [0003] At present, the short-wavelength laser output is mainly realized by using a short-length low-doping ...

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Problems solved by technology

[0004] In order to solve the technical problem of the existing 1.7 μm thulium-doped silica fiber laser due to the short length of the gain fiber and the low doping concentration, the technical problem of incomplete pump light absorption, the present invention provides a 1.7 μm all-fiber based on a bidirectional pumping structure Thulium-doped silica fiber laser

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