Patent ID: 7903325
Filing Date: 2011-03-08
Classification: G02F,H01S,H04N

Abstract:
1. A wavelength converter, comprising: a laser resonator including a fiber containing a laser active material and formed with a fiber grating; a laser light source for emitting an excitation light to the fiber; and a wavelength conversion element for converting a fundamental wave of a laser light emerging from the laser resonator into a harmonic, wherein: the laser resonator includes a first reflection surface arranged near the fiber grating and a second reflection surface arranged near the laser light source; the fundamental wave of the laser light emerging from the laser resonator reciprocates between the fiber grating and the second reflection surface, the excitation light emitted from the laser light source makes a round trip between the second and first reflection surfaces by being reflected by the first reflection surface after being incident through the second reflection surface, and the reflectances of the fiber grating and the first reflection surface satisfy a relationship that the reflectance of the fiber grating is larger than that of the first reflection surface for the wavelength of the fundamental wave and satisfy a relationship that the reflectance of the fiber grating is smaller than that of the first reflection surface for the wavelength of the excitation light.