Stimulated Brillouin gain spectroscopy in a confined spatio-temporal domain (30 μm, 170 ns)
Laboratoire Kastler Brossel, ENS-PSL Université, Sorbonne Université, CNRS, Collège de France,
24 rue Lhomond,
2 Université d’Evry-Val d’Essonne, Université Paris-Saclay, Boulevard François Mitterrand, 91000 Evry, France
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Received in final form: 10 March 2020
Accepted: 26 March 2020
Published online: 12 May 2020
The Brillouin gain spectrum of a test sample (liquid acetone at room temperature) on scales simultaneously confined in space (~30 μm) and time (~170 ns) is reported. This is done using a pulsed stimulated Brillouin scattering gain spectrometer in a θ ≈ 90° crossing beam configuration. After having identified and corrected for different sources of background signals, we obtained a Brillouin gain spectrum allowing an accurate measurement (MHz range) of the Brillouin frequency (few GHz). This is of interest for probing acoustic properties of transparent media subjected to repetitive fast transient phenomena on small length scales.
© L. Djadaojee et al., EDP Sciences, 2020
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