All-fiber polarizer and preparation method thereof

Abstract

The invention discloses an all-fiber polarizer and a preparation method. According to the polarizer, acting surfaces and a metal film are designed on a double-clad fiber, a stripping area is arranged in the middle of a coating layer of the fiber, two acting surfaces are processed on a cladding corresponding to the stripping area, the acting surfaces are symmetrically distributed on the two sides of a fiber core and are parallel to each other, and a layer of metal film is plated on each acting surface. The preparation method disclosed by the invention comprises the steps of firstly, stripping part of the coating on the coating layer; then grinding the cladding to obtain two acting surfaces which are symmetrical and parallel to each other; secondly, plating a layer of metal film on the two acting surfaces; and finally, packaging a coating layer stripping area by using a glass tube. The all-fiber polarizer provided by the invention can be directly welded with the output end of a polarization-maintaining fiber laser, greatly improves the extinction ratio of polarization-maintaining laser while ensuring the transmission efficiency, can realize laser single-mode transmission, ensures that the light beam quality is not degraded, and has the advantages of simple structure, low cost, capability of realizing all-fiber and the like.

Description

technical field [0001] The invention belongs to the field of lasers, in particular to an all-fiber polarizer and a preparation method. Background technique [0002] Polarization-maintaining fiber laser has important application value in coherent communication, laser radar, beam synthesis, nonlinear frequency conversion, gravitational wave detection, and generation of cylindrical vector light. The polarization purity of polarization-maintaining laser is the polarization The extinction ratio directly determines the performance of the polarization maintaining laser, which is mainly reflected in the detection sensitivity, synthesis efficiency, conversion efficiency and other aspects. [0003] There are two main ways to generate polarization-maintaining fiber lasers. One is to generate polarization-maintaining fiber lasers composed of polarization-maintaining fibers and polarization-maintaining devices. The polarization extinction ratio of the laser will degrade, and its extinct...

AI Technical Summary

Problems solved by technology

[0003] There are two main ways to generate polarization-maintaining fiber lasers. One is to generate polarization-maintaining fiber lasers composed of polarization-maintaining fibers and polarization-maintaining devices. The polarization extinction ratio of the laser will degrade, and its extinction ratio generally does not exceed 15dB, and in applications, birefringent crystals or polarizers are usually used for polarization, and the structure is relatively complicated; the other is to use active polarization control technology to Non-PM fiber lasers are used for polarization control to generate polarization-maintaining laser light, which requires the introduction of complex polarization feedback control systems

Therefore, whether it is the first way to introduce birefringent crystals or polarizers to polarize, or the second way to introduce a polarization feedback control system to control the polarization state of the laser, it will greatly increase the cost and make the optical path more complicated. , not easy to maintain

[0004] Therefore, in order to overcome the problems of high system cost and complicated optical path in the prior art for producing polarization-maintaining fiber laser, the present invention provides an all-fiber polarizer and its preparation method

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