Optical fiber end face pumping coupler preparation method based on casing pipe method

Abstract

The invention discloses an optical fiber end face pumping coupler preparation method based on a casing pipe method. An input signal optical fiber is prepared through a corrosion method, then a pumpingoptical fiber is prepared based on a tapering method, and an input signal optical fiber and all the pumping optical fibers are combined through the casing pipe method to form an optical fiber bundle.The optical fiber bundle is subjected to weak tapering, and the size of the fiber core of the input signal optical fiber is not changed in the whole weak tapering process. The end face of the opticalfiber bundle is cut to be flat and then is in low-loss welding with an output signal optical fiber. According to the invention, the pumping coupler based on any signal optical fiber and pumping optical fiber size can be realized, and the practical value of the pumping coupler is improved.

Description

technical field [0001] The invention relates to the field of fiber laser technology, in particular to a method for preparing a fiber end pump coupler. Background technique [0002] Due to the advantages of high conversion efficiency, good beam quality, easy heat dissipation and good working stability, fiber lasers have been widely used in fields including industrial processing, medical treatment and national defense technology. As the power of fiber laser continues to increase, insufficient pumping capacity has become one of the key factors limiting its power increase. Therefore, it is very important to develop a pump beam combiner that can efficiently couple the pump power and ensure the quality of the signal light transmission beam. [0003] According to different coupling mechanisms, fiber pump couplers can be divided into two types: end pump couplers and side pump couplers. The pump coupler injects the pump power through the side of the signal fiber. [0004] At prese...

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Problems solved by technology

[0006] For the traditional (N+1)×1 optical fiber end-face coupler with signal fiber production scheme, the increase in transmission loss and mode degradation caused by the need to taper the input fiber and the mismatch with the core mode field of the output fiber Problem, the present invention proposes a method for preparing an optical fiber end-pumped coupler based on the casing method, which can produce a scheme of (N+1)×1 optical fiber end-pumped coupler according to any output fiber size. Lower device signal insertion loss while maintaining beam quality, enabling higher power, higher beam quality fiber laser systems

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