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Coherent Brillouin spectroscopy in a strongly scattering liquid by picosecond ultrasonics

机译:皮秒超声在强散射液体中的相干布里渊光谱

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摘要

In a modification of a picosecond ultrasonic technique, a short acoustic pulse is launched into a liquid sample by a laser pulse absorbed in a semitransparent transducer film and is detected via coherent Brillouin scattering of a time-delayed probe pulse. With both excitation and probing performed from the transducer side, the arrangement is suitable for in vivo study of biological tissues. The signal is collected from a micrometer-thick layer next to the transducer and is not affected by the diffuse scattering of probe light deeper in the sample. The setup, utilizing a 33 nm thick single crystal SrRuO_(3) transducer film, is tested on a full fat milk sample, with 11 GHz acoustic frequency recorded.
机译:在皮秒超声技术的一种改进中,短声脉冲通过吸收在半透明换能器膜中的激光脉冲发射到液体样品中,并通过时延探测脉冲的相干布里渊散射来检测。通过从换能器侧进行激励和探测,该装置适用于生物组织的体内研究。信号是从换能器旁边的一微米厚的层收集的,不受样品中更深处的探测光的漫散射的影响。该装置利用33 nm厚的单晶SrRuO_(3)换能器膜,对全脂牛奶样品进行了测试,记录了11 GHz的声频。

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