All-fiber structure sodium guide star laser generating device

Abstract

The invention discloses a sodium guide star laser generating device with an all-fiber structure. The laser comprises a pumping source, a secondary input end grating, a primary input end grating, a hollow-core optical fiber, a primary output end grating and a secondary output end grating, wherein the pumping source is used for generating pumping laser with the wave band of 1154 nm, the secondary input end grating, the primary input end grating, the hollow-core optical fiber, the primary output end grating and the secondary output end grating are sequentially arranged on a transmission light path of pumping laser outputted by the pumping source, the primary input end grating and the primary output end grating form a primary resonant cavity, and the secondary input end grating and the secondary output end grating form a secondary resonant cavity, the pumping laser is coupled into the hollow-core optical fiber, a fiber core of the hollow-core optical fiber is filled with working gas, and the working gas is hydrogen. According to the laser, the 589nm laser outputted with high beam quality, high power and narrow linewidth is obtained by utilizing the secondary cascade anti-Stokes stimulated Raman scattering of hydrogen, and the method plays an important role in the adaptive optics field of laser sodium guide star application.

Description

Technical field [0001] The invention belongs to the technical field of lasers, and relates to a new sodium guide star laser generator. Background technique [0002] For ground-based astronomical telescope systems, the wavefront distortion of the earth’s atmosphere on light waves from distant stars is a key issue that affects the imaging resolution and detection sensitivity of the telescope system. Because the sodium atom layer in the middle layer of the atmosphere will interact with the 589nm laser (sodium atom D 2 Line) resonance and backscattering fluorescence, using 589nm sodium guide star laser as a beacon laser to control the deformable mirror to compensate for atmospheric wavefront distortion is the key technology to solve this problem. [0003] The lasers currently used to generate sodium guide stars mainly include dye lasers, all-solid-state lasers, and fiber lasers. Dye lasers can directly radiate 589nm lasers, but they have the disadvantages of huge volume and difficult ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the limitation of stimulated Brillouin scattering on the output power of the existing fiber Raman laser that produces sodium guide stars, and its output performance cannot be further improved

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