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Physical Review Letters

Self-Induced Stimulated Light Scattering

Enrico Santamato, M. Romagnoli, M. Settembre, B. Diano, Y. R. Shen

Published Jul 4, 1988• 46 citations
Publisher

Abstract

The laser-induced collective rotation of molecules in a liquid crystal is treated as a novel stimulated light-scattering process in which the Stokes shift is not constant but is induced by a pump field. The solution following the usual coupled-wave approach appears as a nonlinear eigenvalue problem and exhibits bistable behavior.
DOI
10.1103/physrevlett.61.113

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CRC Press eBooks•Apr 22, 2003•1 citation
A Stokes shifted superbroadening stimulated scattering has been studied in a CS2{\mathrm{CS}}_{2}CS2​ liquid-core hollow fiber system with a long gain length (2.5 m) by using \ensuremath{\approxeq}10-ns laser pulses with a pump intensity range of (106{10}^{6}106--5\ifmmode\times\else\texttimes\fi{}108{10}^{8}108 W/cm2{\mathrm{cm}}^{2}cm2). The salient features of this stimulated scattering are that the spectral broadening range is very large (\ensuremath{\ge}700 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$) and no detectable shift of the spectral maximum or periodical modulation structure is observed. In order to interpret our experimental results, various possible mechanisms and processes are discussed. A model based on stimulated Kerr scattering of anisotropic molecules in liquid is suggested to explain the observation. This model assumes a single-step reorientation of anisotropic molecules induced by an intense optical field.
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