Patent ID: 8773751

Claim:
An optical device, comprising: a ferroelectric crystal substrate, formed by a ferroelectric crystal, that includes an incident surface upon which light impinges, an exit surface which is opposed to the incident surface, a first periodically poled part which is disposed between the incident surface and the exit surface, a second periodically poled part which has a periodically poled structure different from a periodically poled structure of the first periodically poled part and disposed between the first periodically poled part and the exit surface, and a support surface which is different from the incident surface or the exit surface; a support substrate that includes an opposed surface which is opposed to the support surface; and a metal film, disposed between the support surface and the opposed surface, that integrates the ferroelectric crystal substrate with the support substrate, wherein the first periodically poled part and the second periodically poled part are formed in the one ferroelectric crystal substrate; the ferroelectric crystal substrate is shaped like a flat plate and structured so as to include a slab waveguide which guides light incident upon the incident surface to the exit surface and makes light propagate straight inside the slab waveguide; the metal film covers the entire support surface and the entire opposed surface and functions as a common electrode of the first periodically poled part and the second periodically poled part; and the first periodically poled part performs wavelength conversion of light that impinges upon the incident surface and the second periodically poled part performs wavelength conversion or modulation of light that is outputted from the first periodically poled part.