Modularized manufacturing method of multi-core beam combiner

Abstract

The invention relates to a modularized manufacturing method of a multi-core beam combiner, and belongs to the manufacture field of optical passive devices for a fiber laser. The method comprises the following steps that 1) a primary module is prepared by inserting N bare fibers, arranged tightly and orderly, into a primary quartz bushing whose length is the same with that of the N bare fibers, pasting or plugging a sealing material resistant to strong acid corrosion to one or two ends of the primary quartz bushing in a sealing manner, placing the primary quartz bushing into a hydrofluoric acid for corrosion, and removing and cleaning the primary quartz bushing after that the outer wall of the primary quartz bushing reaches a set thickness by corrosion; and 2) multiple identical primary modules are prepared according to the step 1). Compared with a present manufacturing method, the method of the invention has the advantages that it is not required to bind and combine or accurately align multiple tail fibers input to the fiber laser, and the manufacturing technology of the beam combiner is simple, accurate, repeatable and highly integrated.

Description

technical field [0001] The invention relates to a modular manufacturing method of a multi-core beam combiner. This method can be used to make a single module, and can also integrate multiple modules to make a multi-core optical fiber combiner, which belongs to optical passive devices for fiber lasers. field. Background technique [0002] With the development of fiber lasers, on the one hand, the requirements for output power and output beam quality of fiber lasers are getting higher and higher. On the other hand, limited by the damage threshold of the fiber itself, thermal effects and nonlinear effects, the output of a single fiber Most and the beam quality are close to the theoretical limit. In order to further increase the output power of the fiber laser under the condition that the beam quality is close to the diffraction limit, a beam combiner is required. The input end of the beam combiner can be multiple fiber laser modules with high beam quality and high output powe...

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Problems solved by technology

[0004] The main disadvantages of the above-mentioned existing method for making a beam combiner are: 1. the binding of multiple optical fibers or inserting into a plurality of cylindrical holes after alignment requires that the accuracy and repeatability required for the operation in the process are all poor. Not ideal, and as the number of input fibers increases and the diameter decreases, the process difficulty will further increase, so it is difficult to make the number of input pigtails N greater than 19; 2. When the input fiber laser has the same polarization state and the same phase Conditions, when it is necessary to perform coherent beam combining through a beam combiner, the spacing between each fiber core is required to be reduced to obtain a larger duty cycle

Using the existing manufacturing methods, it is difficult to realize the bundling and combining of such a large number of diameter optical fibers or align them and insert them into the cylindrical holes;

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