A gas mixture that prolongs the service life of CO2 lasers

Abstract

The invention discloses a mixed gas for prolonging a service life of a carbon dioxide laser. The gas comprises nitrogen, carbon dioxide, carbon monoxide, oxygen, xenon and helium. A volume fraction inlcudes nitrogen 5-20%, carbon dioxide 5-20%, carbon monoxide 0-10%, oxygen 0-4%, xenon 3-10%, and the balance helium. The mixed gas can prevent decomposition of a CO2 gas, maintain stability of a CO2 component, and then ensure stability of laser output power of the carbon dioxide laser. The mixed gas can greatly improve the service life of the carbon dioxide laser and prolong the service life of more than 20%. In the invention, cost is low, the cost of the laser is greatly reduced, and optical damages of a mirror surface, which are caused by other surface treatment methods, are avoided.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a mixed gas applied to lasers. Background technique [0002] Carbon dioxide laser occupies an important position in the laser family because of its superior beam quality and high cost performance, and it has the widest application in the material processing industry. [0003] At present, traditional DC glass tube lasers are being replaced by a new generation of RF-excited sealed carbon dioxide lasers. For this new type of carbon dioxide laser, since the gas is sealed in the laser cavity, its stability directly affects the performance and service life of the laser. Usually, the gas medium in the carbon dioxide laser cavity is not pure carbon dioxide gas, but mainly composed of carbon dioxide, nitrogen and helium and a small amount of auxiliary gas mixed in a certain proportion. Yan Jixiang, Laser Principles and Technology, Higher Education Press, 2004. [0004] Adam et al. gave a typical ...

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Problems solved by technology

[0013] However, these treatment measures will not only increase the cost of the laser, but also, when the laser works in an environment with continuous switching and strong temperature changes, the protective layer on the aluminum alloy surface will be destroyed due to thermal fatigue, which will cause CO on the one hand. 2 The decomposition of gas; on the other hand, the cracked surface layer will produce a large number of fine oxide particles, which will move in the cavity and attach to the optical mirror surface, causing optical damage to the mirror surface

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