Patent ID: 8416827

Claim:
A gas laser oscillator comprising an oscillator housing formed of a metallic material; a pair of optical bases arranged on two sides of the oscillator housing, connected in parallel by at least three support poles extending in an optical axis direction, and each supporting optical components that form an optical resonator; and a pair of bellows and resilient members that connect the pair of optical bases to the oscillator housing, wherein: in a case in which an optical axis direction of the optical resonator is X-axis, a height direction perpendicular to the optical axis direction is Z-axis, and a direction perpendicular to the X-axis and the Z-axis is Y-axis, the oscillator housing comprises: a main body unit that is formed of a metallic material, shaped into a frame, and has a pair of side panels arranged and spaced apart in the X-axis direction and a top panel and a bottom panel that extend in the X-axis direction to connect the side panels at top ends and bottom ends thereof in the Z-axis direction; and a cover unit that is formed of a metallic material to cover openings of the main body unit, has an arc cross section perpendicular to the X-axis, and includes an outer wall extending in the X-axis direction and side walls connected to both ends of the outer wall in the X-axis direction, and the outer wall is configured to have an arc shape so that force is generated in the Z-axis direction toward outside of the oscillator housing on a connecting portion of the cover unit with the main body unit when the cover unit is fixed to the main body unit with a fixing member.