Abstract
A cube of α-quartz with polished flat and parallel sides was used as an acoustic three-dimensional Fabry-Perot interferometer. The sides of the cube are perpendicular to the crystallographic axesx, y, z of the quartz. By means of a transducer, transverse elastic waves were injected along thez-axis. Because of anisotropy, this produces a diffuse acoustic field in the cube. From this diffuse field, the interferometer selects pure longitudinal acoustic waves along thex andz axis, which were identified by means of the different velocities of propagation.
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