Patent ID: 8135051

Claim:
A gas laser oscillator comprising: a plurality of discharge tube arrays, each discharge tube array including a plurality of electrical discharge tubes aligning in an axial direction thereof; a support mechanism supporting said plurality of discharge tube arrays with axes of said discharge tube arrays extending in directions parallel to or intersecting with each other; and an optical part optically connecting said plurality of discharge tube arrays to each other with all of said plurality of electrical discharge tubes of said discharge tube arrays being arranged optically in series; wherein said optical part comprises: an output minor and a rear mirror, disposed at respective one ends of a pair of electrical discharge tubes located at opposite ends of an optically serial arrangement of all of said plurality of electrical discharge tubes of said discharge tube arrays supported by said support mechanism; and a returning minor disposed at an optical connection between said discharge tube arrays supported by said support mechanism; and wherein said support mechanism comprises: a discharge tube linking holder mutually linking and supporting said plurality of electrical discharge tubes of said each discharge tube array with said electrical discharge tubes aligning in said axial direction; a pair of end plates disposed at axially opposite ends of said each discharge tube array, said end plates supporting said plurality of discharge tube arrays with said axes extending in directions parallel to or intersecting with each other; a plurality of support rods fixed at opposite ends thereof to and extending between said pair of end plates; an elastic member joining said discharge tube linking holder to a first support rod arranged at an upper side as seen in a direction of gravity; and a rigid member securing said discharge tube linking holder to a second support rod arranged at a lower side as seen in a direction of gravity.