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Proceedings Paper

Direct Measurement Of The Nonlinear Refractive Index Of Sf 6 Around 10 µm
Author(s): Y. Beaudoin; I. Golub; S. L. Chin
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Paper Abstract

For many applications related to high power laser propagation such as laser isotope separation or parametric wave mixing, knowledge of the refractive index n in the infrared (IR) is very important to obtain maximum efficiency in these processes. We present here a simple technique to measure directly the nonlinear refractive index n2 of a molecular gas in the IR. We use CO2 laser propagation in SF6 as an example. SPE, is a well-studied molecule exhibiting nonlinear properties such as self-focusing (S.F.), self-defocusing (S.D.) and four-wave mixing of a CO2 laser radiation around 10.6 pm. However, n2 and the related nonlinear susceptibility x(3) of SF6 were derived from indirect experiments by measuring the reflectivity of phase-conjugated signall or from the self-focused beam diameter dependence on laser intensity2. In our case the technique allows to measure directly n2 and to tell the occurence of S.D. or S.F. without having to take into account intensity dependent absorption.

Paper Details

Date Published: 1 January 1987
PDF: 2 pages
Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); doi: 10.1117/12.967210
Show Author Affiliations
Y. Beaudoin, Universite Laval (Canada)
I. Golub, Universite Laval (Canada)
S. L. Chin, Universite Laval (Canada)


Published in SPIE Proceedings Vol. 0813:
Optics and the Information Age

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