Patent ID: 7809033

Claim:
A laser oscillator in which an optical element comprising a mirror or a lens abuts on a cooling flange so that the optical element is cooled, and the cooling flange is flanked with a flange presser and a base so that the cooling flange is fixed, wherein opposing sides of the flange presser and the cooling flange make contact with each other by the intermediary of three protrusions provided in either one of the flange presser and the cooling flange, and the three protrusions are arranged at the vertexes of an equilateral triangle; opposing sides of the cooling flange and the base make contact with each other by the intermediary of three protrusions provided in either one of the cooling flange and the base; the three points at which the flange presser and the cooling flange make contact with each other by the intermediary of the protrusions and the three points at which the cooling flange and the base make contact with each other by the intermediary of the protrusions are arranged in such a way as to face respective corresponding points; the flange presser and the base that flank the cooling flange are fixed fastened with a fastening member; and the respective sides with which the six protrusions make contact are situated in such a way as to be perpendicular to the direction of fastening force produced by the fastening member.