All-fiber Q-switched fiber laser based on stimulated Brillouin scattering

Abstract

The invention discloses an all-fiber Q-switched fiber laser based on stimulated Brillouin scattering, which comprises a low-reflectivity fiber Bragg grating, a laser beam combiner, ytterbium-doped doubly-clad active optical fibers, Sm3+-doped single-mode optical fibers, a high-reflectively fiber Bragg grating and a plurality of pumping sources. The core diameter of the Sm3+-doped single-mode optical fibers is smaller than the core diameter of the ytterbium-doped doubly-clad active optical fibers. The laser beam combiner is provided with a first beam combining connecting end, a second beam combining connecting end and a pumping input end. The first beam combining connecting end is connected with the low-reflectivity fiber Bragg grating. The pumping input end is respectively connected with the input ends of the plurality of pumping sources. The second beam combining connecting end is connected with one end of the ytterbium-doped doubly-clad active optical fibers. The other end of the ytterbium-doped doubly-clad active optical fibers is fused with one end of the Sm3+-doped single-mode optical fibers. The other end of the Sm3+-doped single-mode optical fibers is connected with the high-reflectively fiber Bragg grating. The all-fiber Q-switched fiber laser based on stimulated Brillouin scattering has a passive Q switching function, the automatic Q switching stability is good, the pulse peak power is improved and the pulse width is reduced.

Description

technical field [0001] The invention relates to an all-fiber Q-switched fiber laser based on stimulated Brillouin scattering, which belongs to the field of laser technology. Background technique [0002] At present, the cladding pumping technology appeared in the late 1980s. The emergence of this technology has greatly improved the power level of fiber lasers. At present, the continuous laser power has reached a maximum of 10 kW (IPG company). The fiber laser composed of cladding pumping technology has compact structure and high efficiency, and can be widely used in medicine, laser ranging, remote sensing technology, industrial processing and parametric oscillation, etc., especially in many fields that require the use of high-power light sources. Therefore, fiber lasers have been favored in recent years. [0003] For many applications, a pulsed light source with high peak power is required, and Q-switching technology is an effective way to obtain high peak power. In a typi...

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Problems solved by technology

However, self-Q adjustment also has some disadvantages, such as poor running stability

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