Patent ID: 7830931

Claim:
A semiconductor laser excitation solid laser device, comprising: a semiconductor laser excitation solid laser with use of a non-linear optical crystal; and a control device for stabilizing a light quantity of an output light of the semiconductor laser excitation solid laser, wherein said control device comprises a beam splitter for branching a laser light, which is emitted from the semiconductor laser excitation solid laser and is converted into a harmonics wave with use of the non-linear optical crystal, into the output light and a control light, the ratio of the obtained minimum transmittance to the obtained maximum transmittance being 0.8 or higher and the ratio of the obtained minimum reflectivity to the obtained maximum reflectivity being 0.8 or higher when a light having the same wavelength as the laser light emitted from the semiconductor laser excitation solid laser is incident into said beam splitter by changing the polarization direction thereof to various directions; a light reception element for detecting the light quantity of the control light branched by said beam splitter; and control means for controlling the light quantity of the laser light emitted from said semiconductor laser excitation solid laser so that the light quantity detected by said light reception element will be constant.