Investigation of the Acoustic Waves Behavior at the Multiple Reflection in Paratellurite Crystal

The work describes results of elastic waves propagation peculiarities in a paratellurite material with multiplex reflections of bulk elastic modes. This crystal was chosen for the analysis because of the extremely high elastic anisotropy and the exceptionally great diffraction efficiency in this crystal. The study of wave propagation was carried out by probing the acoustic column with a laser beam, as well as by the method of acousto-optic visualization of acoustic beams. The main parameters of reflected waves, such as phase velocity and walkoff energy, have been studied. Moreover, for the considered ways of acoustic modes spreading in a paratellurite material, the attenuation coefficients have been obtained. These parameters in paratellurite need to be studied. The investigation allows to propose a renewed type of a quasi-collinear tunable acousto-optical filter based on the paratellurite crystal. The new filer is multichannel in contradistinction to the known acousto-optical quasi-collinear devices and allows to operate with several light beams simultaneously.