Abstract

Since the first light-scattering experiment on phonon-polaritons in 1965^[1] these intermediate photon-phonon modes have been intensively investigated by Raman techniques. These studies were mainly concerned with the polariton dispersion (ω(k)) and the frequency dependence of the scattering intensity. The linewidth measurement of a polariton at any given k is much more difficult to obtain in spontaneous Raman scattering experiments, precisely because of the large-variation of the polariton frequency with scattering angle (polariton wave-vector, see Fig. 1), although some results have been obtained using a double deconvolution technique^[2].

© 1986 Optical Society of America