Acoustic resonance in tetragonal and cubic crystals

Abstract

Variants of the resonance excitation of a narrow intense acoustic beam are described for a special geometry of the propagation of an incident pump wave in tetragonal and cubic crystals. Resonances arise when the excited reflected beam propagates at a narrow angle to the surface and has a structure close to the bulk eigenmode. Relations between elastic moduli are established that ensure that the reflection is close to conversion and minimizes the energy loss upon the reflection of a parasitic leakage wave. A number of crystals are found in which these relations can be observed.