MIRROR MEANS FOR LASER STRUCTURES

摘要

A mirror means used in a gas laser structure for permitting an infra-red laser beam to pass therethrough comprising a substrate plate made of an infra-red transparent material and secured air-tightly to the one end of the laser tube, the central portion of the substrate plate being made thinner than the remaining portion and sized substantially larger than the sectional area of the output laser beam, and a reflective metal film coated on the inner surface of the remaining portion. The mirror means is free from being destroyed by a high temperature increase and has a light absorption reduced to a minimum at the central recessed portion, thus providing an utmost high output power.