Pump probe experiment for high scattering media diagnostics

Marie Barthélemy; Nicolas Rivière; Laurent Hespel; Thibault Dartigalongue

doi:10.1117/12.794774

29 August 2008 Pump probe experiment for high scattering media diagnostics

Marie Barthélemy, Nicolas Rivière, Laurent Hespel, Thibault Dartigalongue

Proceedings Volume 7065, Reflection, Scattering, and Diffraction from Surfaces; 70650Z (2008) https://doi.org/10.1117/12.794774
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

Abstract

Optical density measurement is a very powerful tool to characterize particle size and physical property of scattering media such as sprays and engine injection. The major difficulty of such a measurement is the tremendous amount of scattered light: for such media, the optical density can be greater than 10. The goal of this work is to develop a new experimental tool, based on femtosecond laser technology in order to isolate (spatially and temporally) a very limited amount 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 time of flight of every photon in the scattering media. By fine-tuning the optical parameter of the setup, we have been able to selectively 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 been possible to measure the extinction spectra of a model diffused media (SiO2 particle in water), and to determine the particle size distribution after inversion method.

Citation Download Citation

Marie Barthélemy, Nicolas Rivière, Laurent Hespel, and Thibault Dartigalongue "Pump probe experiment for high scattering media diagnostics", Proc. SPIE 7065, Reflection, Scattering, and Diffraction from Surfaces, 70650Z (29 August 2008); https://doi.org/10.1117/12.794774

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available