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Etude de phénomènes non linéaires du second ordre dans les milieux diffusants en phase liquide. Définition et étude d'une configuration adaptée.

Abstract : The experimental determination of the first-order optical rank-3 hyperpolarizability tensor is paramount for the development of new molecules endowed with non-linear optical properties. Hyper-Rayleigh scattering (HRS) is a non-linear light scattering technique where the molecules are within an isotropic solution. Because of orientational and statistical fluctuations, only six observables, i.e. six rotational invariants, are measured by HRS. So as to experimentally determine these six observables, we developed and implemented a dual-rotating-retarders polarimeter operating with a tunable pulse laser source and designed for hyper-Rayleigh scattering measurements. The experimental setup was first optimized by reducing the condition number of the polarization processing matrix, thus reducing the statistical errors. Then we calibrated the setup by using a reference sample devoted to wavelength conversion, so as to reduce the systematic errors. Finally, we performed HRS measurements on two well-known molecules, DR1 and Crystal Violet.
     
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https://tel.archives-ouvertes.fr/tel-00266422
Contributor : Paul Lemaillet <>
Submitted on : Saturday, March 22, 2008 - 12:03:30 PM
Last modification on : Wednesday, September 16, 2020 - 9:56:36 AM
Long-term archiving on: : Thursday, May 20, 2010 - 10:24:09 PM

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  • HAL Id : tel-00266422, version 1

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Paul Lemaillet. Etude de phénomènes non linéaires du second ordre dans les milieux diffusants en phase liquide. Définition et étude d'une configuration adaptée.. Physique Atomique [physics.atom-ph]. Université de Bretagne occidentale - Brest, 2008. Français. ⟨tel-00266422⟩

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