Bell Telephone Laboratories

Albert Anthony Ballman

Ping K Tien

Murray Robbins

Harold Brown

Raymond J Martin

A process is described for producing fine particles of certain double oxide compounds. This procedure is advantageous because of the fine particles produced and the accurate stoichiometry of the resulting product. The process is particularly applicable to the production of such compounds as LiNbO.sub.3 and LiTaO.sub.3 and other compounds where conventional procedures involving heating a mixture of individual oxides leads to stoichiometry problems because of the volatility of one of the component oxides.

Process for producing lithium niobate and lithium tantalate

A process is described for making optical circuits on LiTaO.sub.3 substrates. The process involves putting down an epitaxial layer of LiNbO.sub.3 on the LiTaO.sub.3 substrates. Growth is preferably carried out on certain planes of the LiTaO.sub.3. These optical circuits are unique in that they are smooth, uniform in thickness and have a refractive index significantly larger than that of the substrate. This is advantageous in optical circuitry, since the optical modes in the circuits are quite distinct and can be coupled separately using such light sources as lasers and light emitting diodes.

Waveguiding epitaxial LiNbO.sub.3 films

A liquid phase epitaxial growth technique for growing lithium niobate films on lithium tantalate substrates involves growth from a flux system based on either lithium borate, lithium tungstate, tungsten oxide or potassium tungstate. Optical waveguiding occurs in films grown from the described flux systems.

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Woodbridge, NJ, United States of America

Albert Anthony Ballman