## Brillouin scattering in pure and mixed cubic crystals |

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absorption and emission acoustic approximately autocollimator Brillouin scattering coefficients collimator collimator lens crystal directions cubic crystals defined DEGREES Figure dependence elastic constants electron Equation etalon experimental Fabry-Perot interferometer fringe given by Eq incident light integrated intensities interaction Hamiltonian interaction terms interference order iris diaphram laser beam laser light Laser Polarization 001 light scattered line width Lock-in Amplifier longitudinal admixture Longitudinal Mode matrix elements measurements mirror mixed mode optic axis order perturbation calculation peak intensity phonon phonon absorption Photomultiplier Phys pinhole plane pressure scanning projection lens radiation field Rayleigh Rayleigh scattering results given rotated scattered light scattered photons shifts shown in Figure signal sound propagation direction sound velocities sound waves spacer thickness Stokes and Anti-Stokes Stokes satellite summation telescope temperature terms in Eq transverse transverse mode tube unit polarization vector unshifted vacuum chamber variation vector potential velocity of sound wavelength wavenumber wavevector