... adisplacive excitation of coherent phonon process,3whichwas shown to be a special case of impulsive stimulated Ra-man scattering.4,5 In this study, we investigated coherent phonons in V2VI3compounds ... the initial electron excitation ͑the initialreflectivity drop͒ for all samples, including the superlatticeare close at the same laser fluence, indicating that the laser energies absorbed by the ... frominterface scattering of phonons 9,10as well as otherprocesses.7Even so, there has been no documented evidence of reduction in phonon lifetimes, coherent or otherwise, thatwould begin...