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Temperature effects in proton exchanged LiNbO3 waveguides

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Abstract

Temperature effects on single, homogeneous phases of proton exchanged LiNbO3 waveguides have been studied. The refractive index of α-phase guides on z-cut and x-cut congruent substrates monotonically increases with temperature, the thermo-optical coefficient being similar to that of the substrate. In κ2-phases on z-cut congruent substrates and in β1-phases on z-cut and x-cut congruent and quasi-stoichiometric substrates, the thermo-optical coefficient is smaller than that of the substrate below ∼60 °C and higher above this temperature. A rather similar effect has been observed in β1-phases on z-cut and x-cut congruent substrates in the linear expansion coefficient. The microscopic origin of the phase transition is not known for the moment.

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Alcázar de V., A., Ramiro, B., Rams, J. et al. Temperature effects in proton exchanged LiNbO3 waveguides. Appl Phys B 79, 845–849 (2004). https://doi.org/10.1007/s00340-004-1646-8

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  • DOI: https://doi.org/10.1007/s00340-004-1646-8

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