OPTICAL WAVEGUIDE DEVICE

• Main Authors: KINERI TOORU, MORIKOSHI HIROKI
• Format: Patent
• Language: English
• Published: 12.12.1997
• Edition: 6
• Subjects: AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR; CHEMISTRY; CRYSTAL GROWTH; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; METALLURGY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; REFINING BY ZONE-MELTING OF MATERIAL; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; SINGLE-CRYSTAL-GROWTH; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL

PROBLEM TO BE SOLVED: To obtain an optical waveguide device which is small in size and is low in driving electric power by using a load-contg. perovskite type ferroelectric single crystal film having a high electro-optic coefft. as an optical material having an electro-optic effect. SOLUTION: The optical material of the optical waveguide device formed by using the optical material having the electro-optic effect is the lead-contg. perovskite type ferroelectric single crystal film of which the C-axis is oriented in the direction perpendicular to the substrate surface. More preferably, the compsn. formula or this ferroelectric single crystal film is (PBx-a M1a )M2y Ox . M1 if this compsn. formula denotes an alkaline metal, alkaline earth metal, etc., and M2 denotes titanium, zirconium or am element consisting essentially of titanium and zirconium. The electro-optic coefft. of the lead-contg. perovskite type ferroelectric single crystal film used as the material of the optical waveguide is about 4 to 7 times the electrooptic-coefft. of lithium niobate and is capable of giving rise to a large change in phase by the light propagating in the waveguide.