Crystal Technology, Inc.

U.S. Philips Corporation

Peter F Bordui

Richard G Norwood

Dieter Hans Jundt

Gabriel M Loiacono

John L Nightingale

Ronald Blachman

Eugene M Standifer

George D Calvert

Crystals of lithium niobate and lithium tantalate are preconditioned to intentionally increase their electrical conductivity, thus providing crystals with an increased ability to reduce surface charging. Reducing surface charging reduces the risk that the crystals may catastrophically discharge, and adversely affect the performance of devices in which the crystal is incorporated.

Preconditioned crystals of lithium niobate and lithium tantalate and method of preparing the same

A method of growing optical quality beta barium borate; crystals from a pure NaCl fluxed melt. The method comprises maintaining particular thermal field conditions throughout the melt and slowly cooling the melt to cause beta barium borate to crystallize from the melt. The rate of cooling may be at a rate of not greater than 3.degree. C. per day. The method may utilize a seed crystal, suspended into the melt, so that the beta barium borate may crystallize on the seed crystal.

Method for crystal growth of beta barium boratean

A new compositional relationship in the starting charge of a crystal growth station (FIG. 1 ) provides homogeneous monocrystalline lithium niobate. A new measurement system (FIG. 2 ) provides Curie point values of significantly greater accuracy then that of conventional measurements. Careful control of the starting charge composition for crystal growth and effective utilization of the measurement system enable the determination of the compositional range of starting charges for producing congruent crystalline production. The composition corresponds to a mol percentage of 48.35.+-..01 to 48.40.+-..01 of Li.sub.2 O and the remainder Nb2.sub.O 5 for producing homogeneous crystal whose solidification fraction of the molten charge exceeds that which was heretofore achievable.

Composition for growth of homogeneous lithium niobate crystals

An optical element composed of a single crystal consisting essentially of potassium titanyl phosphate, which is represented by the formula KTiOPO.sub.4 and which is doped with cerium. The optical element has a high optical transmissivity property for radiation from the near-UV to the mid-infrared spectral regions.

Optical device using a cerium-doped KTP crystal

Large flow-free crystals of KiTiOPO.sub.4 and the Rb, Tl, and As analogs are produced by preparing a melt of KtiOPO.sub.4 or its analog in a flux in which the ratio by weight of KTiOPO.sub.4 to the flux at the seeding temperature is equal to the saturation value of the KTiOPO.sub.4 in the flux, suspending a crytal of KTiOPO.sub.4 in the melt and then slowly decreasing the temperature of the melt while essentially spatially isothermal conditions are provided throughout the melt.

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Menlo Park, CA, United States of America

Peter F Bordui