W-stage 980nm single-mode ytterbium-doping optical fiber laser and frequency-doubling system combination thereof

Abstract

The invention provides a watt-level 980 nm single-mode ytterbium-doped fiber laser and a frequency doubling system thereof. An Nd:YAG solid-state laser pumping source is radiated into single-mode ytterbium-doped optical fiber in a folded-type pumping mode; a resonant cavity of the fiber laser is the whole single-mode ytterbium-doped optical fiber; two 0-degree angle optical fiber end faces of the single-mode ytterbium-doped optical fiber are used as cavity mirrors of the resonant cavity; by reasonably choosing the length of the optical fiber, four-energy-level oscillation starting is inhibited and the maximum output of 980 nm laser is realized; frequency doubling is carried out to the 980 nm laser by use of a frequency doubling crystal BIBO so as to obtain 490.8 nm blue light. The output of watt-level single-mode 980 nm laser is realized through the system with simple structure and convenient operation, and 15 mW of the 490.8 nm blue light is obtained after frequency doubling. The 980nmsingle-mode ytterbium-doped fiber laser can be used as a pump light source of an ytterbium-doped fiber amplifier and be widely applied to communication. The 490.8 nm blue light obtained after frequency doubling can be applied to submarine communication and marine resource detection.

Description

technical field [0001] The invention relates to a combination device of a watt-level 980nm single-mode ytterbium-doped fiber laser and its frequency doubling system, which belongs to the field of laser technology. Background technique [0002] Fiber laser is a laser with fiber doped with rare earth ions as the gain medium. With the continuous development of doping technology, the level of design and manufacturing of doped fiber is gradually improving, coupled with the rapid development of high-power semiconductor lasers, making fiber The advantages and characteristics of lasers have been fully utilized in the application fields of laser processing, laser medical treatment, optical communication and national defense. They compete with traditional solid-state lasers and become one of the fastest-growing laser technologies in the current laser field. [0003] Among the numerous doped fiber lasers, Ytterbium-doped fiber lasers are developing most rapidly. The current high-power...

AI Technical Summary

Problems solved by technology

The all-fiber laser uses the grating as the feedback cavity mirror and the output mirror to experiment with 980nm low-power output. This simple and convenient structure is the development trend of the quasi-three-level ytterbium-doped fiber laser, but the output power of this laser is small and cannot meet some requirements. application requirements

Using a general flat mirror as a cavity mirror to experiment with a 2W978nm output fiber laser has a complex structure and poor stability, and because the frequency-doubling crystal PPLN has a small acceptance wavelength and temperature bandwidth, and the thickness direction of the periodically polarized crystal is very small, this There are high requirements on the output beam quality and focusing system of 980nm

Images