Bell Telephone Laboratories

Harold Brown

Ping K Tien

Albert Anthony Ballman

Raymond J Martin

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.

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Harold Brown