Abstract
Raman scattering of optical waveguides formed by proton-exchange in lithium tantalate is studied. The effect of a post-exchange annealing up to 420°C on the optical properties and Raman spectra are also investigated. Two types of Raman bands are observed: those which are very strongly influenced by the presence of protons (“proton-related” bands) and those characteristic of the pure crystal (“bulk” bands). The intensity of the two kinds of bands depends in an opposite way on the annealing temperature, with the “proton-related” bands following the anomalous behaviour of ne. The spectra from samples annealed up to the temperature of the maximum value of ne are remarkably similar to the high-temperature paraelectric spectra of a LiTaO3 single crystal.
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