SINGLE CRYSTAL OF LITHIUM TANTALATE, ITS PRODUCTION, PRODUCTION DEVICE THEREFOR AND OPTICAL ELEMENT

• Main Authors: NITANDA FUMIO, FURUKAWA YASUNORI, SATO MASAZUMI, ITO KOHEI
• Format: Patent
• Language: English
• Published: 27.04.1993
• Subjects: AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; 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; DEVICES USING STIMULATED EMISSION; ELECTRICITY; FREQUENCY-CHANGING; METALLURGY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; 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

PURPOSE:To obtain single crystal of lithium tantalate having excellent light damage resistance characteristics and to improve stability of SHG element and characteristics in rise of output by using the single crystal of lithium tantalate as a substrate for optical element utilizing short wavelength light and by taking advantage of a high nonlinear optical coefficient of the single crystal. CONSTITUTION:The objective single crystal of lithium tantalate has improved light damage resistance characteristics by adding <=10atom% one or more elements of the group IIA of the periodic table selected from Mg, Ca, Sr and Ba, and a strong light element using the single crystal is provided.