| 摘要 |
PURPOSE:To reduce noise due to a temperature change of light output of the title device by a method wherein a holder holding a solid state laser medium, an output mirror and a nonlinear optical element, and a box body fixing the holder are made of invar. CONSTITUTION:A resonator consisting of a semiconductor laser 11, a solid laser medium 13 and an output mirror 15 as well as a nonlinear optical element 14 arranged inside this resonator are provided. Especially, the holders 21 holding a solid laser medium 13, a nonlinear optical element 14 and an output mirror 15, and a box body 22 fixing these holders 21 are of invar. This invar has the constitution of iron 63.5%, nickel 36.5%. The linear expansion coefficient at 20 deg.C is 0.13X10<-6> while having small value such as 1/113 to 1/177 to the linear expansion coefficients of stainless steel, bronze and aluminum. Thereby, a low noise level can be maintained even if changes are caused in temperature of the holders 21 and the box body 22 fixing the holders 21. |
