Gain optical fiber for outputting specific single-mode lasers

Abstract

The invention discloses a gain optical fiber for outputting specific single-mode lasers. The gain optical fiber comprises a fiber core, a wrapping layer and a coating layer, wherein the fiber core, the wrapping layer and the coating layer are sequentially arranged from inside to outside. A rare earth ion doping area is contained in the fiber core of the gain optical fiber, a corresponding relationship exists between a distribution area of the rare earth ion doping area in the fiber core and light strength distribution of the specific single-mode lasers output by the gain optical fiber in advance, and the corresponding relationship refers that an area scope of distribution of the rare earth ion doping area in the fiber core is an area scope of I>(1 / 2)Imax in the light strength distribution of the specific single-mode lasers in the fiber core, wherein the I is the light strength of the specific single-mode lasers at any point in the fiber core, the Imax is the maximum value of the light strength, and the number of the Imax is larger than or equal to one. The gain optical fiber can achieve fundamental mode output of an optical fiber laser, can further achieve output of a specific single high-order mode of the optical fiber laser, and has actual guiding significance on mode control of the optical fiber laser.

Description

technical field [0001] The invention relates to the field of fiber lasers, including fiber oscillators and fiber amplifiers, in particular to a gain fiber for outputting specific single-mode lasers. Background technique [0002] Fiber laser is a laser that uses optical fiber as the gain medium. By doping different rare earth ions in the fiber matrix material, the laser output of the corresponding band is obtained. In recent years, with the development of high brightness laser diode pumping technology and large mode field double-clad doped fiber manufacturing process, the output power of a single double-clad fiber laser has increased rapidly. In 2003, Limpert et al. of Jena University in Germany obtained a 500W continuous laser. In 2004, Jeong of Southampton University in the UK achieved a laser output of 1.36kW. Jeong increased the output power of the laser to 2.1kW by improving the gain fiber parameters and increasing the pump power. In June 2009, the American IPG compan...

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Problems solved by technology

The Chinese patent document with the publication number CN101688948A mentions segmental gain doping of optical fibers, but the scheme in this patent also designs the doping distribution in the inner cladding, and utilizes a long-period grating to realize the transition from the fundamental mode to the higher-order mode. Conversion, the scheme is relatively complicated, which is not conducive to actual implementation

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