Abstract
Planar waveguides were produced by K+-Cs+ exchange of Z-Cut KTiOPO4 single domain crystals. The analysis of the refractive index profile has shown an exponential Cs+ distribution in the exchanged layers. By exciting different waveguide modes, Raman spectra were obtained from guide depths with varying Cs doping. Significant changes have been observed between Raman spectra of Cs:KTiOPO4 and those of pure KTiOPO4 only in the region of external vibrations while the internal modes, due to vibrations of the TiO6 and PO4 groups, are practically the same. The bands corresponding to the external vibrations were found to be strongly influenced by the substitution indicating strong disorder in the lattice, and possibly a structural phase transition. Furthermore, Raman spectroscopy proves to be an alternative technique for determining variation in Cs composition.
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