Patent ID: 7386022

Claim:
A laser oscillator comprising: an excitation light source module in which a cooling water channel for cooling its excitation light source is formed; a light condensing block having a through-hole for housing a laser medium, and an aperture for introducing into the through-hole excitation light from the excitation light source module; an end plate fixed to an end of the light condensing block, in which a cooling water channel for leading cooling water to the light condensing block and a cooling water channel for leading cooling water to the excitation light source module are formed; and a flow tube, fixed and sealed by the end plate, for forming a cooling water passage for the laser medium; wherein an aperture of the cooling water channel on the excitation-light-source-module side of the end plate, communicating with the cooling water channel formed in the excitation light source module, is provided on a side face of the end plate, the excitation light source module is fixed to the end plate with a fixing means, and supply of cooling water into the light condensing block is fed through a front face of the end plate into the flow tube, and supply of cooling-water into the excitation light source module is fed bypassed from the front face of the end plate to the side face of the end plate.