Patent ID: 9172201
Filing Date: 2015-10-27
Classification: G02B,G02F,G03B,H01S

Abstract:
1. A wavelength conversion laser light source, comprising: a pump light source; a solid laser medium to which pump light from the pump light source is input and which generates a fundamental light wave; a wavelength conversion element which converts the fundamental light wave into a second harmonic light wave having a higher frequency than the frequency of the fundamental light wave; a concave mirror on which a first reflecting surface reflecting the fundamental light wave and the second harmonic light wave is formed; and a wavelength plate on which an optical film is formed, wherein the optical film includes a second reflecting surface reflecting the fundamental light wave and transmitting the second harmonic light wave; a laser resonator is constituted by the first reflecting surface and the second reflecting surface; the solid laser medium is arranged on the first reflecting surface side of the laser resonator, the wavelength plate is arranged on the second reflecting surface side of the laser resonator, and the wavelength conversion element is arranged between the solid laser medium and the wavelength plate; the solid laser medium outputs light other than linearly polarized light as the fundamental light wave; the light other than linearly polarized light is directly input from the solid laser medium to the wavelength conversion element; and the wavelength plate outputs the second harmonic wave converted by the wavelength conversion element to an exterior of the laser resonator via the second reflecting surface.