时域布里渊散射测量液体中laser诱导的温度梯度
Time-domain Brillouin scattering for the determination of laser-induced temperature gradients in liquids
摘要：
我们提出了一种基于超快光声的光学技术，以精确地确定与激光加热光学传感器接触的液体样品中的局部温度分布。这种超快泵浦探测实验使用时域布里渊散射（TDBS）来局部确定光散射频移。由于温度影响布里渊散射频率，TDBS信号探测了液体中的局部激光诱导温度分布。我们证明了这种技术的相关性和灵敏度的测量的绝对激光诱导的温度梯度的玻璃形成液体原型，甘油，在不同的激光泵浦功率-即不同的稳态背景温度。作为补充，我们的实验说明了这种TDBS技术可以应用于测量复杂的多层系统中的热扩散接触到周围的液体。
英文摘要：
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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