Patent ID: 8705165

Claim:
An optical wavelength conversion element comprising: a wavelength conversion waveguide that has a periodic polarization reversal structure having alternately and cyclically formed domains of which polarization directions are inverted, guides light as a fundamental wave corresponding to the periodic polarization reversal structure, and performs a wavelength conversion of the guided fundamental wave; a first clad that is made of a dielectric having a refractive index lower than that of the wavelength conversion waveguide and is provided in contact with each of the domains; a second clad that is made of a dielectric having a refractive index lower than that of the wavelength conversion waveguide and is provided in contact with each of the domains such that the second clad is opposed to the first clad; a first conducting unit that electrically connects to each of the domains in parallel via the first clad; and a second conducting unit that electrically connects to each of the domains in parallel via the second clad, wherein the second conducting unit is a conductive heat sink that is provided at a side of the second clad and discharges heat generated by the wavelength conversion waveguide.