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Pump probe experiment for high scattering media diagnostics

机译：泵探头实验高散射媒体诊断

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Optical density measurement is a very powerful tool to characterize particle size and physical property of scatteringmedia such as sprays and engine injection. The major difficulty of such a measurement is the tremendous amount ofscattered light: for such media, the optical density can be greater than 10. The goal of this work is to develop a newexperimental tool, based on femtosecond laser technology in order to isolate (spatially and temporally) a very limitedamount of non scattered transmitted light, and to measure the extinction of the media. We collect the transmitted light and we use an optical Kerr gating. This technique is very powerful to determine the timeof flight of every photon in the scattering media. By fine-tuning the optical parameter of the setup, we have been able toselectively increase the gating efficiency of the ballistic part vs the diffusive part of the collected light. Furthermore, spectral tunability of amplified femtosecond laser system is straightforward. As a result, it has beenpossible to measure the extinction spectra of a model diffused media (SiO_2 particle in water), and to determine theparticle size distribution after inversion method.
机译：光学密度测量是一种非常强大的工具，可以表征散射媒体的粒度和物理性质，例如喷雾和发动机注入。这种测量的主要难度是散射光的巨大光线：对于这种介质，光学密度可以大于10.这项工作的目标是基于飞秒激光技术开发一种新的实验工具，以便隔离（空间并且时间上）非常有限的非散射透射光，并测量介质的灭射。我们收集透射光，我们使用光学kerr门控。这种技术非常强大，可以确定每个光子在散射介质中的飞行时间。通过微调设置的光学参数，我们已经能够妥协地提高弹道部的门控效率与收集的光的漫射部分。此外，扩增的飞秒激光系统的光谱可调性是简单的。结果，可以测量模型扩散培养基（水中SiO_2颗粒）的消光光谱，并确定复位方法后的颗粒尺寸分布。

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