Abstract

Proton-exchanged LiTaO₃ waveguides have been reported to have attractive properties such as a highly preserved electro-optic coefficient _γ33,^1,2 and lower susceptibility to optical damage than Ti-indiffused LiNbO₃ waveguides.² We have previously reported that an increase in the surface extraordinary refractive indices was observed after annealing ³. We investigated this phenomenon in detail by using nuclear reaction and IR absorption spectra.

© 1991 Optical Society of America