Abstract
We have observed polariton modes in ${\mathrm{Li}}_{2}{\mathrm{GeO}}_{3},$ and measured their dispersion curves by Raman scattering in the near-forward-angle geometry. We determined the low-frequency dielectric constant $\ensuremath{\varepsilon}(0)$ by making a theoretical fit to the dispersion curve for a low-frequency polariton, and also by using our measured values of transverse-optical and longitudinal-optical mode frequencies in the extended Lyddane-Sachs-Teller relationship. The two approaches yield $\ensuremath{\varepsilon}(0)=15.0\ifmmode\pm\else\textpm\fi{}0.3$, a value that we compare to results from infrared data and in the near-dc limit.
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