Method for eliminating Li.sub.2 O out-diffusion in LiNbO.sub.3 a

Details Method for eliminating Li.sub.2 O out-diffusion in LiNbO.sub.3 a Method for eliminating Li.sub.2 O out-diffusion in LiNbO.sub.3 a

1978-05-30

1980-04-08

Fisher, Richard V.

65 30R, 65 30E, 65117, C03C 2100, G02B 514

Patent

active

041969634

ABSTRACT:
A process for suppressing the out-diffusion of Li.sub.2 O from LiNbO.sub.3 and LiTaO.sub.3 waveguide structures by exposing the structures to a Li.sub.2 O-rich environment at sufficient vapor pressure that Li.sub.2 O diffuses into the structure as a compensation process and a solid-solid surface interaction occurs. In one embodiment of the invention, the out-diffusion of Li.sub.2 O from LiNbO.sub.3 and LiTaO.sub.3 crystals into which Ti has been diffused is eliminated by annealing the structure in a high purity powder of LiNbO.sub.3 or LiTaO.sub.3. In a second embodiment, the Li.sub.2 O out-diffusion is partially suppressed by annealing the structure in molten LiNO.sub.3. In a third embodiment of the invention, a waveguide structure comprising a Li.sub.2 O-rich guiding layer is formed by annealing LiNbO.sub.3 or LiTaO.sub.3 crystals in a high purity powder of LiNbO.sub.3 or LiTaO.sub.3, which not only suppresses Li.sub.2 O out-diffusion but also promotes Li.sub.2 O in-diffusion into the crystals.

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S. Miyazawa, R. Guglielmi, and A. Carenco, "A Simple Technique for Suppressing Li.sub.2 O Out-diffusion in Ti:LiNbO.sub.3 Optical Waveguide", No. 11, Dec. 1, 1977, pp. 742-744.
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