ACOUSTIC SHEAR-WAVE PROPAGATION IN PARATELLURITE WITH REDUCED SPREADING

An original configuration of propagation of acoustic shear wave in Par atellurite slightly off the [110] axis in the (001) plane is described It allows greatly reducing the spreading of the acoustic energy. The main characteristics of an acousto-optic interaction with this acousti c shear wave are then discussed. An experimental validation based on t he schlieren method is finally proposed. It shows the effective reduct ion of the acoustic beam diffraction of the shear wave propagating wit h a 5-degrees angular tilt. It is compared with the acoustic diffracti on obtained for a shear wave propagating in TeO2 along the [110] axis without angular tilt.