Patent ID: 8531760
Filing Date: 2013-09-10
Classification: B82Y,G02F,H01S

Abstract:
1. A wavelength converting device generating an idler light having a wavelength of 5 to 10 μm from a pump light, said wavelength of said idler light being longer than that of said pump light, said wavelength converting device comprising: a wavelength converting layer comprising a semiconductor non-linear optical crystal and having a thickness of 50 μm or smaller, said wavelength converting layer comprising at least one fiat main face and a crystal orientation inversion structure wherein crystal orientation of said optical crystal is inverted at a predetermined period; a Peltier device controlling a temperature of said wavelength converting layer; and a clad portion joined with said fiat main face of said wavelength converting layer and provided between said wavelength converting layer and said Peltier device; wherein said pump light, said idler light and said signal light satisfies a phase matching condition of the following formula (1), in the conditions that “np” represents a refractive index of said wavelength converting layer with respect to said pump light, “λp” represents a wavelength of said pump light, “ns” represents a refractive index of said wavelength converting layer with respect to said signal light, “λs” represents a wavelength of said signal light, “ni” represents a refractive index of said wavelength converting layer with respect to said idler light, “M” represents a wavelength of said idler light, “λi” represents a wavelength of said idler light, and “Λ” represents a period of inversion of said crystal orientation: