Abstract
Proton-exchanged LiTaO3 waveguides1 fabricated by both simple one-step proton exchange2 and similar proton exchange followed by annealing3 in benzoic acid were reported to have a negligible decrease in the r33 electro-optic coefficient. It was also reported that the propagation loss was reduced in pyrophosphoric acid proton-exchanged LiNbO3 waveguides.4
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