A fiber coupler for high-efficiency coupling of high-power pump light

Abstract

The invention relates to an optical fiber coupler for realizing high-efficiency coupling of high-power pump light, and belongs to the technical field of optics and laser optoelectronics. Its characteristic is that in the application of using fiber coupler to pump fiber laser, the pump light emitted by the laser pump source passes through the action of optical coupling components, directly enters the fiber input end of the fiber coupler, and then passes through the multi-branch The transmission of the pump fiber is injected into the main fiber of the fiber coupler at the output end of the pump fiber. The pump light is transmitted along a certain direction inside the main fiber, and finally output at one end of the main fiber for pumping the fiber laser. Since the multi-branch pumping fiber of the fiber coupler proposed by the present invention has only one fiber input end, and because the end face shape of the fiber input end can be arbitrary, it does not need a complex shaping coupling system, and can be directly connected to various forms of The laser pump source is matched, and the fiber insertion efficiency is high, which avoids the complex optical shaping system.

Description

technical field [0001] The invention relates to an optical fiber coupler, which belongs to the technical field of optics and laser optoelectronics. Background technique [0002] Fiber lasers have attracted widespread attention due to their high efficiency, low threshold, high beam quality, compactness, and high performance / price ratio, and have been developed by leaps and bounds. In recent years, due to the maturity of high-power pump source technology and the application of cladding pump technology, the output power of fiber lasers and fiber amplifiers has been significantly improved, showing broad application prospects in military, medical and industrial processing fields. [0003] At present, the most critical issue limiting the increase in the output power of double-clad fiber lasers is how to obtain more pump power from the gain fiber, so improving the pump coupling method between the pump source and the fiber and increasing the optical power into the fiber has become a...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a fiber coupler that realizes high-efficiency coupling of high-power pump light. Since the multi-branch pump fiber has only one fiber input end, it overcomes the problems of complex structure and difficult installation and adjustment in the prior art. Disadvantages: Since the shape of the fiber input end can be any shape such as rectangle, ellipse, circle, triangle, etc., there is no need for a complex shaping coupling system, and it can be directly matched with various forms of laser pump sources, and the fiber entry efficiency is high, so It overcomes the disadvantages of low pumping efficiency, low optical power into the fiber, and difficult coupling between the laser pump source and a single small-diameter pump fiber in the prior art.

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