Interaction of Almost-Collinear Longitudinal Phonons
#MMPMID26366015
Barrett HH
; Matsinger JH
Phys Rev
1967[Feb]; 154
(3
): 877-886
PMID26366015
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The interaction of two longitudinal ultrasonic waves to produce sum- and
difference-frequency waves has been studied experimentally and theoretically.
These interactions are closely analogous to the type of three-phonon interactions
believed to be important in low-temperature ultrasonic attenuation. We have
applied the coherent-state formalism to a description of these interactions and
have discussed the similarities between coherent and incoherent processes.
Experimentally we have measured the amplitude of the generated sum- or
difference-frequency wave as a function of the angle between the input waves and
of the amplitude and frequency of the input waves. The effect of crystalline
anisotropy has also been observed. The change in amplitude of one of the input
waves has been measured as a function of the parameters listed above. In all
cases the experimental observations are in good agreement with theory.
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