Infrared Absorption Spectroscopy of Optical Waveguide in Proton-exchanged LiNbO3
FU Yun-liang1, 3，JIN Guo-liang2，YUAN Yi-fang3，HE Meng-xiong4，DENG Guang-qiang4
1. Department of Physics, Hainan Normal College，Haikou 571158，China 2. Department of Applied Physics，Shanghai Jiaotong University, Shanghai 200240，China 3. College of Optics and Electron Information Engineering, University of Shanghai for Science and Technology, Shanghai 200093，China 4. Center of Analysis and Testing，Hainan Normal College，Haikou 571158，China
Abstract：Z-cut proton-eｘchanged LiNbO3 optical waveguides eｘchanged with different proton sources miｘed with adipic acid and benzoic acid in different mol ratios were analyzed by infrared absorption spectroscopy. The result shows that there is an absorption peak of OH- free group at 3 500 cm-1with the characteristic of substitute protons, and the absorption peak of H-bond is nearby 700 cm-1 with the characteristic of packing protons. The different miｘing ratios and different concentrations of H＋ in the proton source，result in different proton-eｘchanged velocities and bring on the change in these absorption peaｋs. It is very important to study the change in these absorption peaｋs for maｋing high ｑuality LiNbO3 optical waveguide.
[1] Jackel J L. SPIE, 1991, 1583: 54. [2] Vittorio M N, Mario N et al. J. Lightwave Technol., 2002, 20(1)：71. [3] Korkishko Y N, Fedorov V A，Micheli M P et al. Opt. Mater., 1996, 5: 175. [4] WANG Yan-ji, SONG Zeng-fu(王彦吉，宋增福). Spectral and Chromatographic Analysis(光谱分析与色谱分析). Beijing: Peking University Press(北京：北京大学出版社)，1995.
