Abstract
A comprehensive study of vibrational spectra of a KTP single crystal is presented using both Raman scattering and Infrared (IR) reflectance. The 196 mode frequencies are listed according to a revised group theoretical analysis, which addresses the different atomic clusters comprising the crystal unit cell and their symmetry. Inverse LO-TO splitting is suggested to interpret the ν3 vibrational spectra of the PO43- clusters of the A1 symmetry. Theoretical account invokes a proximity between strong and weak polar vibrations and Lyddane-Sachs-Teller’s model of LO-TO splitting in a dielectric medium [1]. Many other mode frequencies appear too close to allow unequivocal interpretation of their LO-TO splitting sign.
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