Abstract
A former investigation of one of the present authors (JK) and coworkers, concerning the role of isotopic scattering of optic zone-center phonons in natural and isotopically enriched Ge crystals, had revealed that the phonon-population lifetimes, as obtained from the signal decay in two-pulse picosecond anti-Stokes Raman spectroscopy, are systematically longer than the phonon lifetimes derived from linewidth studies of 1st-order Raman spectra. The authors explained this discrepancy as arising from the interference of the phonon-decay dynamics with the phonon-generation dynamics during the laser pulses. The present work critically re-examines and confirms this original interpretation through a detailed k -space Ensemble-Monte-Carlo simulation of the two-pulse Raman experiment
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