Gas laser oscillator.

摘要

A gas laser oscillator has at least a partial reflection unit (21) and a total reflection unit (24), each of which comprises an extension unit for connecting between a gas introducing unit and a fixed block unit. The gas introducing unit has a gas inlet port (28) for circulating laser gas in a laser tube (25), and the fixed block unit is provided for fixing a reflector (in 21 or 24). A gas inlet port (28) of the gas introducing unit is arranged with a predetermined interval of 120 mm or more so that the reflectors (in 21 or 24) are free from contamination by floating powders and deterioration by ultraviolet lays.