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《Chinese Journal of Lasers》 2005-01
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Optical Characterization and Stability Study of LiNbO_3 Optical Waveguides Fabricated by Buffered Acid

CAO Xia 1, JIN Xiao-feng 2, WANG Zhi-guo 3, CHENG Li-hua 1 1State Key Laboratory for Modern Optical Instrumentation, 2Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China 3Department of Physics, Tongji University, Shanghai 200092, China  
Proton exchange waveguides were fabricated by buffered acid (benzoic acid doped with a certain amount of lithium benzoate) in Z-cut LiNbO 3. The effective diffusion coefficients and the index profile were calculated for the waveguides fabricated in buffered benzoic acid with different molar fractions of lithium benzoate with aspect to benzoic acid (0.5%, 1.0% and 1.5%). The effective diffusion coefficient decreases exponentially as the molar fraction of lithium benzoate increases. The surface index increment decreases linearly with the increase of the Li + mole percent in the proton source. The stabilities of these fabricated waveguides are studied. The results are compared with those from the waveguides fabricated by pure benzoic acid. The stabilities of LiNbO 3 proton exchange waveguides can be improved by the exchange with buffered benzoic acid.
【Fund】: 国家自然科学基金(60377022 60408001);; 国家博士后基金资助项目
【CateGory Index】: TN252
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