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Article Abstract
Single crystals of a non-centrosymmetric and polar CsBiO(GeO) compound were grown from melt. This material was characterized by polarized Raman scattering at room temperature. The comparison to the polycrystalline IR and Raman spectra has been made and assignment of all observed modes to the respective vibrations and their symmetry has been proposed. Our results show that this crystal is promising SRS-active nonlinear optical material for up- and down-Raman laser-frequency converters with the most intense lasing line at 481 cm. Optical studies show that CsBiO(GeO) exhibits intense absorption bands with peaks maxima at 260 and 293 nm (77 K) typical for S→P transitions of Bi ions, which are parity-allowed due to spin-orbit coupling as well as unexpected band centered at 360 nm that was assigned to intervalence charge transfer transition.
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