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Proceedings Paper

Heterogeneous mixtures as NLO Christiansen filters for optical limiting
Author(s): Gregory J. Exarhos; Kim F. Ferris; William D. Samuels
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Paper Abstract

Mixtures of two non-absorbing and index-matched materials with contrasting nonlinear optical response have been shown to optically limit above a critical fluence of pulsed nanosecond laser light. Under these conditions, index mismatch is induced between the disparate phases leading to strong Tyndall scattering. The effect has been demonstrated previously by the authors in both solid-liquid mixtures (hexadecane and calcium fluoride), and surfactant-stabilized liquid-liquid emulsions consisting of dichloroethane as the organic phase and a concentrated aqueous phase of sodium thiocyanate (NaSCN). Materials used in these studies exhibit low absorption coefficients over extended wavelength regions allowing for a broadband response of the limiter. Recently, limiting has been observed at 532 nm in a polymer composite consisting of barium fluoride and poly-(n-butyl acrylate). A modified open-aperture z-scan method was used to quantify optical limiter performance in this system. Modeling studies provide the basis for designing optical limiters based upon this light scattering mechanism and show the importance of size resonance and constituent optical properties on limiter performance.

Paper Details

Date Published: 10 June 2004
PDF: 11 pages
Proc. SPIE 5273, Laser-Induced Damage in Optical Materials: 2003, (10 June 2004); doi: 10.1117/12.524443
Show Author Affiliations
Gregory J. Exarhos, Pacific Northwest National Lab. (United States)
Kim F. Ferris, Pacific Northwest National Lab. (United States)
William D. Samuels, Pacific Northwest National Lab. (United States)


Published in SPIE Proceedings Vol. 5273:
Laser-Induced Damage in Optical Materials: 2003
Gregory J. Exarhos; Arthur H. Guenther; Norbert Kaiser; Keith L. Lewis; M. J. Soileau; Christopher J. Stolz, Editor(s)

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