THERMOELASTIC STRESSES AS A MECHANISM OF ELECTROMAGNETIC-ACOUSTIC TRANSFORMATION

The excitation of thermal waves of frequency omega in anisotropic cond uctor by electromagnetic wave of the same frequency incident on its su rface is investigated. The normal lo metal surface does not coincide w ith the axis of symmetry of crystal. Due to the thermoelectric effect oscillations of temperature appear in the metal, which in turn excite ultrasonic waves as a result of thermoelastic stresses. The role of th e relatively high constant magnetic field in the processes of linear t hermoelastic generation of ultrasound is found. The nonlinear (on the frequency 2omega) thermoelastic generation of ultrasound is studied an d the analysis of the present experimental situation in the field is g iven.