Abstract
A high-resolution Brillouin scattering system has been developed for the purpose of observing and analysing the spectral shape of low frequency phonons down to ∼ 100 MHz . A spherical Fabry–Pérot interferometer with a resolution of about 10 8 is utilized. However, with such a high-resolution spectrometer, the frequency of a usual single-mode laser is not sufficiently stable. In order to avoid the influence of its drift, we developed a computer controlled procedure for spectra accumulation. The soft acoustic mode of the ferroelastic crystal KD 3(SeO 3) 2 has been observed by applying the present system. The Brillouin spectra are well adjusted by a damped harmonic oscillator. The temperature dependence of the damping constant shows no anomalies in contrast with that of the frequency.
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