Abstract
The effect of elastic anisotropy on surface phonon focusing in the (1 1 1) surface of cubic crystals is studied theoretically and experimentally. Calculations of the focusing factor for BaF 2, NaCl, CaF 2 and KCl are compared with anisotropic powder patterns created by laser-generated surface acoustic waves. Formation of a pair of caustics in 〈1 1 2 〉 directions with increasing anisotropy is observed. Conditions for caustics to appear on a (1 1 1) cubic crystal surface are expressed in terms of the elastic constant ratios.
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