Propagation and decay of equilibrium phonon polaritons studied via near-forward Raman scatteringстатья
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Аннотация:For the technique of near-forward Raman scattering, the possibility to measure relaxation times and group velocities of phonon polaritons at frequencies close to resonances is discussed. Polariton relaxation times are measured as a function of frequency for crystals of lithium iodate and niobate. For group velocity measurements, it is shown experimentally that the result depends on the way of processing the frequency-angular scattering spectra. (C) 1999 Published by Elsevier Science B.V. All rights reserved.