Possibility of crystalline axis determination in cubic BSO crystal by Brillouin scattering experiment

The single crystal BSO of high quality was grown in air by Czochriaski method. We prepared one cubic shape sample of which the crystal axes were unknown. We have confirmed the directions of crystal axes and the elastic properties in the prepared BSO crystal by Brillouin scattering experiment. In the case of cubic symmetry crystals it is impossible to observe the conoscope image in the polarizing microscope. Determination of crystal axes by XRD in the bulk crystal is a very tedious work. So we propose the least squares fit method to determine the cubic crystal axes by Brillouin scattering experiment.