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arXiv · 1702.01078

Time-domain Brillouin scattering for the determination of laser-induced temperature gradients in liquids

I. Chaban·D. Shin·C. Klieber·R. Busselez·V. Gusev·Keith A. Nelson·T. Pezeril
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Abstract

We present an optical technique based on ultrafast photoacoustics to precisely determine the local temperature distribution profile in liquid samples in contact with a laser heated optical transducer. This ultrafast pump-probe experiment uses time-domain Brillouin scattering (TDBS) to locally determine the light scattering frequency shift. As the temperature influences the Brillouin scattering frequency, the TDBS signal probes the local laser-induced temperature distribution in the liquid. We demonstrate the relevance and the sensitivity of this technique for the measurement of the absolute laser-induced temperature gradient of a glass forming liquid prototype, glycerol, at different laser pump powers - i.e. different steady state background temperatures. Complementarily, our experiments illustrate how this TDBS technique can be applied to measure thermal diffusion in complex multilayer systems in contact to a surrounding liquid.

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I. Chaban, D. Shin, C. Klieber, R. Busselez, V. Gusev, Keith A. Nelson, T. Pezeril. 2017-02-03. Time-domain Brillouin scattering for the determination of laser-induced temperature gradients in liquids. https://doi.org/10.1063/1.4993132

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