Abstract
We have previously reported for the first time an increase of the surface extraordinary refractive index after annealing in H+:LiTaO3 optical waveguides fabricated in benzoic acid or pyrophosphoric acid [1]. This anomalous index increase is thought to be caused by a movement of protons in a unit cell [2, 3]. Recently, we have also reported that the higher surface index was observed for waveguides proton-exchanged in diluted benzoic acid when compared with those fabricated using neat benzoic acid [3]. In this paper, we investigate the effects of melt dilution on the properties of H+:LiTaO3 waveguides by examining the effective index, measuring the electrooptic coefficient , and performing XRC analysis and IR absorption spectroscopy.
© 1992 Optical Society of America
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