Comment on Keller's Theory of Brillouin Scattering.

摘要

Keller has published a treatment of Brillouin scattering inside an anisotropic crystal with application to off-axis phonons in CdS, whereas the present authors have provided a treatment valid for a crystal of any symmetry and level of anisotropy, any direction of input light, scattered light, and sound (consistent with phase matching) and to either polarisation of the light beams and any type of sound wave. Moreover, the treatment includes solid angle and demagnification corrections for an arbitrarily oriented exit crystal surface. As the treatment of Keller does not use the dyadic Green's function appropriate to an anisotropic medium, his results are in disagreement with the present authors after they have omitted the surface corrections from the theory. (Author)