Optical isolation system and optical isolator

Abstract

An optical isolation system used for isolating reflection lasers of a laser comprises a film absorption reflector and a 90-degree phase delay mirror, wherein the linearly polarized light is reflected at a 45-degree angle, the included angle between the polarized direction of the linearly polarized light and the reference surface is 45 degrees, and S polarized light is emitted out; the 90-degree phase delay mirror and the film absorption reflector are oppositely arranged in parallel, the 90-degree phase delay mirror can convert the S polarized light into circularly polarized light emitted out at a 45-degree reflection angle, and the circularly polarized light is used for processing a workpiece. An optical isolator converts the linearly polarized light into the circularly polarized light through the film absorption reflector and the 90-degree phase delay mirror. The circularly polarized light reflected by the workpiece is converted into P polarized light and is absorbed by the film absorption reflector finally, and therefore the lasers are prevented from being reflected into the laser, and the isolation purpose is achieved. The invention further provides the optical isolator comprising the optical isolation system.

Description

technical field [0001] The invention relates to an optical element, in particular to an optical isolation system and an optical isolator. Background technique [0002] In terms of industrial production, laser processing is a method of processing materials using the interaction characteristics of laser beams and substances. Laser processing methods mainly include laser cutting, laser welding, laser drilling, laser marking, laser surface treatment, rapid prototyping of parts and other application processes, and have been widely used in automotive, electronics, aerospace, metallurgy, machinery manufacturing and other industrial fields . It plays an increasingly important role in realizing production automation, improving product quality and labor productivity, reducing material consumption, and reducing environmental pollution. [0003] Carbon dioxide laser is a gas laser with carbon dioxide gas as the working substance, which emits a laser beam with a wavelength of 10.6 micr...

AI Technical Summary

Problems solved by technology

When using a high-power carbon dioxide laser for processing, when the high-energy laser beam irradiates materials with low absorption rate at 10.6 microns or materials with high surface finish, a large amount of laser energy will be reflected, and part of the reflected light will be along the original The optical path returns to the carbon dioxide laser oscillation cavity. Due to the high energy density of the laser beam, a large amount of heat will be generated, resulting in a decrease in the output power of the laser, resulting in a decrease in the service life of the carbon dioxide laser. In severe cases, the carbon dioxide laser will be burned

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