Block diagram of rapid optical beating Brillouin scattering spectroscopy.
Schematic view of the resonant cavity. Glass reflectors have surfaces polished to optical grade. The parallelism of the countering phonon reflector is adjusted to be better than .
Photograph of the resonant cavity and specimen (liquid toluene). The resonant cavity is submerged in the specimen, as shown in the figure.
(a) Brillouin spectra of toluene obtained outside and (b) inside the cavity. (c) shows the best-fitted curve of Eq. (1) to the data of (b). The scattering wave number is .
Resonant Brillouin spectrum of toluene obtained at a scattering wave number of . The solid line below shows the theoretical prediction.
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