NONLINEAR OPTICAL MATERIAL, ITS PRODUCTION, AND NONLINEAR OPTICAL DEVICE AND DIRECTIONAL COUPLER-TYPE OPTICAL SWITCH USING IT

摘要

PURPOSE: To obtain a large nonlinear optical effect and to improve heat resistance by using such polyimide obtd. by diamine and/or 2-acid anhydride or 2-thioacid anhydride having substitution of a part having a nonlinear optical effect. ;CONSTITUTION: This nonlinear optical material consists of polyimide obtd. by diamine and/or 2-acid anhydride or 2-thioacid anhydride with substitution of a part having a nonlinear optical effect. Thereby, an intermediate clad layer is formed by vapor deposition a wet process of dielectric material in a manner that the dielectric material is formed to the required thickness by vapor deposition or spin coating in a bonding area without using a mask. Then a mask having an aperture in the nonbonding area is disposed parallel to the vapor deposition surface with a certain distance, and further the dielectric material is vapor deposited. Thus, thickness of the intermediate clad layer can be continuously changed from the bonding area to the nonbonding area, and by this method, a directional coupler can be produced.;COPYRIGHT: (C)1994,JPO&Japio