Time-domain Brillouin scattering for the determination of laser-induced temperature gradients in liquids
We present an optical technique based on ultrafast photoacoustics to 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 li...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Published: |
American Institute of Physics (AIP)
2018
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| Online Access: | http://hdl.handle.net/1721.1/113388 https://orcid.org/0000-0001-7124-7957 https://orcid.org/0000-0001-7804-5418 |
| Summary: | We present an optical technique based on ultrafast photoacoustics to 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 te mperature 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 with a surrounding liquid. |
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