Abstract
This paper reports observations of the intense focusing of acoustic energy that occurs along the symmetry axis in a zinc single crystal. The focusing is associated with a conical point in the wave surface and thereby the phenomenon of external conical refraction. Our observations have been obtained with (i) pointlike piezoelectric transducers (PZT) as source and detector, (ii) a focused pulsed laser source and small PZT detector, and (iii) a breaking capillary source and capacitive detector at epicenter.
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