Novel sodium guide star laser generating device
A technology for generating devices and sodium guide stars, which is applied in the field of lasers, can solve problems such as output power limitations, and achieve the effects of increasing interaction distance, high gain coefficient, and multiple types of media
Pending Publication Date: 2020-10-30
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to overcome the limitation of the output power of the existing fiber Raman laser that produces sodium guide stars due to stimulated Brillouin scattering
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Embodiment 1
[0030] figure 1It is a structural schematic diagram of a novel sodium guide star laser generating device provided by Embodiment 1 of the present invention, including a pump source 1, an input fiber Bragg grating 2, a π-phase-shift fiber grating 3, an input fusion splicing point 4, and a hollow-core fiber 5 , output fusion splicing point 6, output fiber Bragg grating 7, cladding light filter 8, chirped tilted fiber grating 9, frequency doubling system 10. A continuous fiber laser or amplifier in the 1 μm band is used as the pumping source 1, and the pumping laser is coupled into the hollow-core fiber 5 through a small gas cavity. The interaction with the pump laser provides the ideal environment. The hollow-core optical fiber 5 is a hollow-core photonic crystal fiber, and the working gas filled into the hollow-core photonic crystal fiber is propane (C 3 h 8 ), n-butane (C 4 h 10 ) or isobutane (C 4 h 10 ) One of the three gases can shift the pump laser frequency to 1178n...
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The invention discloses a novel sodium guide star laser generating device. The device comprises a pumping source, an input end grating, a hollow-core fiber, an output end grating and a frequency multiplication system, wherein the pumping source is used for generating pumping laser with the waveband of 1 micron, an input end optical grating, a hollow-core optical fiber, an output end optical grating and a frequency doubling system are sequentially arranged on a transmission light path of pumping laser outputted by the pumping source, an input end grating and an output end grating form a resonant cavity structure, the pump laser is coupled into the hollow-core optical fiber, a fiber core of the hollow-core optical fiber is filled with working gas capable of shifting the frequency of the pumplaser to 1178nm, and the frequency doubling system is used for doubling the frequency of the 1178nm laser to obtain 589nm sodium guide star laser resonating with a sodium atom absorption spectral line. According to the device, the optical fiber gas laser is built, and gas stimulated Raman scattering in the hollow-core optical fiber is utilized, so operation of the laser is not limited by stimulated Brillouin scattering, and the output power is greatly improved.
Description
technical field [0001] The invention belongs to the technical field of lasers and relates to a novel sodium guide star laser generating device. Background technique [0002] For ground-based astronomical telescope systems, the wavefront distortion produced by the earth's atmosphere on the light waves from distant stars is a key issue affecting the imaging resolution and detection sensitivity of the telescope system, because the sodium atomic layer in the middle layer of the atmosphere will interact with the 589nm laser (the sodium atom D. 2 line) resonance and backscatter fluorescence, using 589nm sodium guide star laser as a beacon laser to control the deformable mirror to compensate the atmospheric wavefront distortion adaptive optics is the key technology to solve this problem. [0003] At present, the lasers used to produce sodium guide stars mainly include dye lasers, all-solid-state lasers and fiber lasers. Dye lasers can directly radiate 589nm laser light, but they ...
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IPC IPC(8): H01S3/08H01S3/094H01S3/109H01S3/22H01S3/30
CPCH01S3/08013H01S3/094042H01S3/109H01S3/22H01S3/305
Inventor 王泽锋黄威李昊周智越崔宇龙李智贤裴闻喜王蒙陈子伦李霄陈金宝
Owner NAT UNIV OF DEFENSE TECH