Patent ID: 8018646
Filing Date: 2011-09-13
Classification: C30B,G02F

Abstract:
1. A wavelength conversion element for performing a wavelength conversion, the wavelength conversion element comprising a substrate including a nonlinear optical single crystal having a periodically poled structure, wherein: the substrate comprises lithium niobate; the lithium niobate is Mg-doped has a congruent composition, such that the Mg-doped lithium niobate has a Mg concentration of 5.1 mol % to 5.7 mol %; a depth of the periodically poled structure is 20% or more of a thickness of the substrate; a visible light transmittance of the substrate is 85% or higher when ultraviolet light is irradiated to the substrate; and the wavelength conversion element performs the wavelength conversion by outputting laser light having an average output of 1 W or more by shortening a wavelength of input laser light emitted from a light source, the wavelength of the input laser light emitted from the light source being 640 nm to 2000 nm.