Authors: A Alcázar de V B Ramiro J Rams B Alonso G Rojo V Bermúdez JM Cabrera
Publish Date: 2004/09/29
Volume: 79, Issue: 7, Pages: 845-849
Abstract
Temperature effects on single homogeneous phases of proton exchanged LiNbO3 waveguides have been studied The refractive index of αphase guides on zcut and xcut congruent substrates monotonically increases with temperature the thermooptical coefficient being similar to that of the substrate In κ2phases on zcut congruent substrates and in β1phases on zcut and xcut congruent and quasistoichiometric substrates the thermooptical coefficient is smaller than that of the substrate below ∼60 °C and higher above this temperature A rather similar effect has been observed in β1phases on zcut and xcut congruent substrates in the linear expansion coefficient The microscopic origin of the phase transition is not known for the moment
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