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- W2500634057 abstract "In the past few years there has been a significant progress in the study of the dynamics of high-frequency acoustic phonons [1–3]. A rich variety of phenomena could be disclosed through the application of new experimental techniques to inject high-frequency phonons. The aim of this paper is to review, though not exhaustively, the various methods for high-frequency phonon injection and the main results obtained with them in a number of crystal types. The emphasis will be on incoherent phonon generation throughout the entire Brillouin zone by optically pumping impurity centers dispersed in the crystal and on surface generation of the phonons by thin-film heating. Most of the work discussed in this paper relies on methods for frequency-selective phonon detection in order to unravel the phonon dynamics [3]. In section 2 the volume generation is discussed of monochromatic phonons by direct transitions, including the dynamics of the resonant phonons, stimulated emission and the spectral width of the produced phonons. In section 3, the volume generation of broadband phonons is examined. Surface generation of high-frequency phonons is discussed in connection with thin-film heaters in section 4 and point-contact phonon generators in section 5." @default.
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- W2500634057 date "1986-01-01" @default.
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- W2500634057 title "High-Frequency Phonon Injection" @default.
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- W2500634057 doi "https://doi.org/10.1007/978-3-642-82912-3_92" @default.
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