Polarization coupling device

Abstract

The invention provides a polarization coupling device. The polarization coupling device comprises a rectangular prism, a rhombic prism and a 1 / 2 wave plate. A first right angle plane of the rectangular prism faces towards the direction of an incident laser. The length of a first long edge plane of the rhombic prism is equal to the length of an bevel edge plane of the rectangular prism, either the first long edge plane or the bevel edge plane or both the first long edge plane and the bevel edge plane are plated by a polarization spectroscopic film layer and are closely attached to the polarization spectroscopic film layer to form a polarizing beamsplitting interface. A second long edge plane of the rhombic prism is plated by a laser all reflective film, a first short edge plane of the rhombic prism faces the direction of the incident laser, and a second short edge plane of the rhombic prism serves as a laser sending plane. The 1 / 2 wave plate is located at the front end of a light path of the first right angle plane of the rectangular prism when the polarization spectroscopic film layer is an S polarized light high permeability P polarized light high reflective film, and the 1 / 2 wave plate is located at the front end of a light path of the first short edge plane of the rhombic prism when the polarization spectroscopic film layer is a P polarized light high permeability S polarized light high reflective film. According to the polarization coupling device, the size of a light beam of a single laser light source can be compressed.

Description

technical field [0001] The invention relates to the technical field of semiconductor lasers, in particular to a high damage threshold polarization coupling device for high-power semiconductor lasers. Background technique [0002] Semiconductor lasers have the advantages of high photoelectric conversion efficiency, small size, and long life. They are widely used in various fields, especially kilowatt-level high-power semiconductor lasers with high beam quality and high brightness. Medical and other fields have a wide range of applications and good development prospects. [0003] However, the output light of semiconductor lasers is incoherent in space. High-power semiconductor lasers have more light-emitting units, and the defects of poor beam quality and low brightness of the output light greatly limit its application and promotion. Therefore, improving beam quality and luminous brightness has become the key to the further development of high-power semiconductor lasers. [...

AI Technical Summary

Problems solved by technology

[0006] However, for the above-mentioned polarization coupling device, it can only compress the beam size of two laser light sources, but cannot compress the beam size of one laser light source

In addition, there are strict requirements on the space placement of the laser light source, the structure of the whole system is not compact enough, it takes up a lot of space, and it is inconvenient to move

In addition, the polarization cube splitting interface of the polarization coupling device is generally connected by ordinary glue, and the ability to resist laser damage is poor

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