Patent ID: 8792529

Claim:
A gas laser oscillator comprising: a discharge section for exciting laser gas; a blowing section for transmitting the laser gas; and a laser gas flowing path for forming a circulation route of the laser gas between the discharge section and the blowing section, the blowing section comprises: a rotary part to be rotated by a shaft driver; and a non-rotary part not to be rotated; the rotary part includes: a rotary shaft to which an impeller is mounted at an end; a motor-rotor of the shaft driver is coupled to the rotary shaft; and an upper bearing and a lower bearing coupled to the rotary shaft, wherein the rotary part is detachable from the non-rotary part, and wherein contact of the lower bearing between the rotary part and the non-rotary part is less rigid than contact of the upper bearing between the rotary part and the non-rotary part.