Temperature dependence of the Raman spectrum on K1−xRbxTiOPO4single crystals and relation with the non-linear dynamical properties

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Abstract
K1−xRbxTiOPO4 single crystals are increasingly attractive for non-linear optical applications, especially for optical harmonic conversion. Many investigations have been undertaken in order to understand the physical origin of these non-linearities. Within this framework, the vibrational spectra of K1−xRbxTiOPO4 with x = 0.0, 0.4 and 1.0 have been recorded in a large temperature range from 10 to 1000 K and for various geometrical configurations. The low-temperature spectra allow to analyse the symmetry of the modes and their physical origin. For instance, the identification of the modes showing important scattered intensity in terms of involved bands gives valuable indication on the cause of the optical non-linearity. The Raman spectra from room to high temperature, which show occurrence of a strongly polarised quasi-elastic scattering, are analysed and discussed.