Patent ID: 6447606
Filing Date: 2002-09-10
Classification: C30B,G02F,Y10S

Abstract:
A method for producing a single-crystalline film for an optical waveguide device, said film being made of a single crystal of lithium potassium niobate-lithium potassium tantalate solid solution or a single crystal of lithium potassium niobate, both having a tungsten-bronze structure, said method comprising the steps of:preparing a target made of a material for said single-crystalline film; preparing a foundation made of a single crystal of lithium potassium niobate-lithium potassium tantalate solid solution or a single crystal of lithium potassium niobate; irradiating the target with a laser beam to gasify molecules constituting the target by dissociation and evaporation thereof; and epitaxially growing the single-crystalline film on the foundation; whereby the single-crystalline film has a substantially single-domain structure without requiring poling treatment.