Abstract
Peak arrival times of heat pulse profiles in vitreous silica vary linearly with propagation distances in the energy range from about 20 W/mm2 to 160 W/mm2 at 2.3 K, suggesting the features of quasidiffusive propagation. These arrival times are, however, retarded with increasing pulse energy, which is inconsistent with the simple quasidiffusion picture. We explain this discrepancy in terms of a phonon hot spot which act to efficiently down-convert the high-frequency phonons very near the excitation spot.
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