High-resolution Rayleigh-Brillouin correlation spectroscopy.
The high spectral resolution inherent in correlation spectroscopy may also be used for Brillouin spectroscopy. The heterodyne method described in this Letter is based on spontaneous scattering, in contrast to the recently developed high-resolution gain spectroscopy. A measurement of n-butane vapor is reported as an example. A Brillouin linewidth of ~200 kHz was resolved with an accuracy of a few percent.
Simonsohn
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Wagner
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