Patent ID: 8331415

Claim:
A laser light source device comprising: a pump light source which emits transverse-multimode light; a plurality of resonator mirrors which define a resonator, at least part of the resonator mirrors outputting light, the output light having plural wavelengths; a laser medium arranged in the resonator, the laser medium being pumped with the transverse-multimode light emitted from the pump light source; and a wavelength conversion element arranged in the resonator, the wavelength conversion element being irradiated with a transverse-multimode line beam of fundamental wave obtained by oscillation at the laser medium and outputting a line beam of converted wave and further wherein the fundamental wave and the converted wave are simultaneously output and light having wavelengths different from the fundamental wave and the converted wave and/or second harmonic or third harmonic such that spatial intensity modulation is substantially eliminated, and further wherein output light is transverse-multimode light with low coherency and wherein one of the resonator mirrors has a reduced reflectance so that a transmittance is in a range of from 0.5% to 1% for the fundamental wave which is output for annealing.