Semiconductor laser processing machine with light-feedback-proof device

Abstract

The invention relates to a semiconductor laser processing machine with a light-feedback-proof device. The semiconductor laser processing machine comprises two semiconductor laser stack arrays, wherein the two semiconductor laser stack arrays are in parallel arrangement in the same direction and have two different wavelengths and the same polarization state, the two semiconductor laser stack arrays respectively send out P or S polarization state laser beams with the wavelengths being Lambda 1 and Lambda 2, a reflecting prism in arrangement of forming a 45-degree angle with a light path is arranged in front of one semiconductor laser stack array, and a wavelength beam gathering prism and a polarization beam splitting prism in arrangement of forming a 45-degree angle with the light path and a quarter wave plate and a focusing lens in arrangement vertical to the light path are respectively and sequentially arranged in front of the other semiconductor laser stack array. The semiconductor laser processing machine with the light-feedback-proof device has the advantages that the quarter wave plate is combined with the polarization beam splitting prism at the inside, reflecting light on the surface of workpieces during the high-power laser processing can be effectively prevented from returning to the inside of a cavity of the semiconductor laser, the damage to the inside of the laser and the cavity surface film is reduced, and further, the service life of the laser is improved.

Description

technical field [0001] The invention relates to a semiconductor laser processing machine, in particular to a semiconductor laser processing machine with an anti-light feedback device. Background technique [0002] Due to the continuous improvement and improvement of semiconductor lasers in terms of output power, electro-optical conversion efficiency, reliability and cost, the use of high-power semiconductor lasers for material processing has become an international hotspot. As an advanced manufacturing technology, high-power semiconductor laser processing technology has great advantages in improving product productivity, processing automation, environmental pollution and reducing cost consumption. In laser processing applications, the optical power of a single semiconductor laser stack can no longer meet the actual needs. In order to increase the output power of high-power semiconductor lasers, it is required to combine the light emitted by multiple semiconductor laser stack...

AI Technical Summary

Problems solved by technology

However, when the laser processing is performed on the surface of a metal workpiece at such a high power, part of the reflected light on the surface of the workpiece will return to the cavity of the semiconductor laser along the original optical path, which will cause damage to the inside of the semiconductor laser and its cavity film, and then make the laser. Decreased output power and shortened life

Since the current semiconductor laser processing machines use polarization beam combining and wavelength beam combining, and the reflected beam has the same wavelength as the light emitted by the laser, and returns along the original optical path, it is difficult to pass through the optical path in the optical system. The traditional method of processing its reflected light

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