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Phase composition of channel proton-exchanged waveguides in different near-congruent LiNbO3
Ferroelectrics Letters Section  (IF0.96),  Pub Date : 2020-01-24, DOI: 10.1080/07315171.2020.1799627
Sergey M. Kostritskii, Yuri N. Korkishko, Vyacheslav A. Fedorov, Oleg G. Sevostyanov, Irina M. Chirkova, Edvard Kokanyan, Michel Aillerie

Abstract Micro-Raman spectroscopy and method of Raman data calibration are proposed for the quantitative study of the proton-exchanged LiNbO3 channel waveguides, which contain the different HxLi1–xNbO3 phases, depending on the fabrication conditions. The spectroscopic parameters, phase composition and electro-optic properties of these waveguides have been found to be depending on the small variation of stoichiometry in the near-congruent lithium niobate substrates used for waveguides fabrication.