Raman-susceptibility, damping-constant, and oscillator-strength determination from stimulated polaritons in quartz

Abstract

We study coherent excitation of polaritons by a two-beam method, measuring the amplification of the lower-frequency beam. The experimental polariton dispersion curve is used to get the oscillator strengths for the $E$ modes of quartz. Damping constants and Raman nonlinear coefficients are also determined from a comparison between experimental and theoretical results, including incident-beam spectral width and divergence influence.