US Patent 7372621 Wavelength converting devices

A wavelength converting device 1 has a ferroelectric layer 6 made of a ferroelectric material. The ferroelectric layer has a wavelength converting portion A having a ridge-type optical waveguide 7, additional portions A and B provided in both sides of the wavelength converting portions, respectively, and groove-forming portions C and D between the wavelength converting portion and the additional portions, respectively. The device further has a supporting body 2 adhered to a back face 6f of the ferroelectric layer 6, and back side metal films 5A and 5B covering at least a part of a back face 6f of the additional portions 6, respectively. The back side metal film 5A or 5B does not cover the back face 6f of the wavelength converting portion 6.