H:LiNbO3 and H:LiTaO3 waveguides: the kinetic model of proton exchange with cationic vacancies participation

V. A. Ganshin; Yuri N. Korkishko

doi:10.1117/12.145598

14 May 1993 H:LiNbO₃ and H:LiTaO₃ waveguides: the kinetic model of proton exchange with cationic vacancies participation

V. A. Ganshin, Yuri N. Korkishko

Author Affiliations +

Proceedings Volume 1932, Guided-Wave Optics; (1993) https://doi.org/10.1117/12.145598
Event: Guided Wave Optics, 1992, Moscow, Russian Federation

Abstract

The kinetic model of proton exchange in LiNbO₃, LiTaO₃ crystals is proposed. The model is based on the formalism of relative composing units, which enables the user to find the expressions for gradients of chemical potentials of diffused particles in the sublatticies of sites and intersites. The diffusion equations for hydrogen, lithium, and vacancies in sites are obtained. Their solutions with some values of self-diffusion coefficients allow us, for the first time, to explain the step-like concentration profile of hydrogen, the upper limit of its concentration, the asymmetry of hydrogen and lithium depth-distributions, and some other specific features of proton exchange process.

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V. A. Ganshin and Yuri N. Korkishko "H:LiNbO₃ and H:LiTaO₃ waveguides: the kinetic model of proton exchange with cationic vacancies participation", Proc. SPIE 1932, Guided-Wave Optics, (14 May 1993); https://doi.org/10.1117/12.145598

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