Abstract
Brillouin scattering spectra in the geometry x ( y , x ) y were measured in mixed crystals KDP 1- x DKDP x for x =0.04, 0.08, 0.23. 0.46 and 0.72. A spectrum consists of a broad component owing to polarization fluctuation and a phonon peak. On the assumption that polarization fluctuation is of Debye type, a relaxation time of an individual dipole is evaluated by fitting the calculated spectrum to an experimental one in a polarization fluctuation-acoustic phonon coupling system. The relaxation time increases from 0.19 ×10 -12 sec at x =0.04 to 1.03 ×10 -12 sec at x =0.72.
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