Patent ID: 8784675

Claim:
A manufacturing method of optical device, comprising: a first step of integrating a ferroelectric substrate formed by ferroelectric crystals with a support plate which is thicker than the ferroelectric substrate to support the ferroelectric substrate with the support plate by a conductive junction between one major surface of the ferroelectric substrate and one major surface of the support plate; a second step of forming a pattern electrode which has a periodic pattern on the other major surface of the ferroelectric substrate; and a third step of applying a voltage between the pattern electrode and the junction and forming a periodic domain inverted region in the ferroelectric substrate, wherein the first step comprises the steps of: forming a first insulation layer on one major surface of the ferroelectric substrate; forming a first metal layer on the first insulation layer; forming a second metal layer on one major surface of the support plate; and joining the first metal layer with the second metal layer and accordingly integrating the ferroelectric substrate with the support plate to support the ferroelectric substrate with the support plate.