Elastic and photoelastic constants of ZnTe measured by Brillouin scattering

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The elastic and photoelastic constants of ZnTe crystals have been determined from Brillouin scattering spectra with 90 degrees -scattering geometry at room temperature. From the measured frequency shifts of the Brillouin doublets, the following values are obtained for the elastic constants: C 11 =7.22+or-0.02, C 12 =4.09+or-0.06 and C 44 =3.080.03 in units of 10 10 N m -2 . From the comparison of the absolute intensities of the Brillouin doublets measured in ZnTe with that in fused quartz whose photoelastic constants are well-known, the following values are determined for the photoelastic constants: P 11 =0.144+or-0.007, P 12 =0.094+or-0.005 and P 44 =0.046+or-0.003.