Patent ID: 8121156

Claim:
A solid-state laser device, comprising: a semiconductor laser light source for emitting a laser beam for pumping; an optical resonator including (i) a solid laser crystal for oscillating a fundamental wave by being excited by incidence of a laser beam to oscillate the fundamental wave, and (ii) a pair of mirrors arranged at opposite sides of the solid laser crystal; and a wavelength conversion element for converting the fundamental wave into harmonics, wherein a reflective coat for reflecting the harmonics is formed on an end surface of the wavelength conversion element toward the solid laser crystal, wherein the end surface of the wavelength conversion element, having the reflective coat formed thereon, is inclined at a specified angle with respect to a plane perpendicular to an optical axis of the fundamental wave, wherein the wavelength conversion element is arranged in the optical resonator so that (i) an optical axis of a harmonic propagating toward the solid laser crystal is made different from the optical axis of the fundamental wave, and (ii) the harmonic, having the optical axis different from the optical axis of the fundamental wave, is output substantially in the same direction as another harmonic, wherein the end surface of the wavelength conversion element, having the reflective coat formed thereon, is ground obliquely with respect to a Z axis of a substrate material so as not to be parallel with another end surface of the wavelength conversion element through which the fundamental wave passes, and wherein a grinding angle of the end surface of the wavelength conversion element, having the reflective coat formed thereon, with respect to the plane perpendicular to the optical axis of the fundamental wave is 0.4 to 2°.