i
-HxLi1-xNbO3 phases generated on x-cut LiNbO3 the new anisotropic libration mode at 890–940 cm-1 is observed in addition to the known isotropic mode at 960–970 cm-1, whereas the same phases on z-cut exhibit only latter isotropic libration mode. The observed phenomena are explained as a result of anisotropic stresses generated in the x-cut waveguides, whereas the stresses in the structures on z-cut are isotropic. The OH-bond librations are clearly anisotropic in the α, κ1, and κ2 phases generated on both z- and x-cuts, which indicates a fundamental difference of the local symmetry of the proton’s position in the βi phases compared to the α, κ1, and κ2 HxLi1-xNbO3 phases.
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Received: 4 May 1998/Revised version: 26 June 1998
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Korkishko, Y., Fedorov, V. & Kostritskii, S. Effect of stresses on the OH libration bands in proton-exchanged LiNbO3 optical waveguides . Appl Phys B 67, 577–581 (1998). https://doi.org/10.1007/s003400050549
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DOI: https://doi.org/10.1007/s003400050549