Non-linear Raman effects and photodarkening in chalcogenide glassV. K. Tikhomirov1, 2, 3, M. Barj1, S. Turrell1, J. Kobelke4, N. Idrissi1, M. Bouazaoui2, B. Capoen2 and A. B. Seddon3
1 Laboratoire de Spectrochimie Infrarouge et Raman (CNRS, UMR 8516), Bât. C-5 Centre d'Etudes et de Recherches Lasers et Applications (CERLA-FR CNRS 2416) Université des Sciences et Technologies de Lille - 59655 Villeneuve d'Ascq, France and
2 Laboratoire de Physique des Lasers, Atomes et Molécules (CNRS, UMR 8523), Bât. P-5, Centre d'Etudes et de Recherches Lasers et Applications (CERLA-FR CNRS 2416) Université des Sciences et Technologies de Lille - 59655 Villeneuve d'Ascq, France
3 Novel Photonic Glasses Research Group, Wolfson Building, University of Nottingham Nottingham NG7 2RD, UK
4 Institute for High Physical Technology - Jena, Germany
received 3 February 2006; accepted in final form 1 September 2006
published online 27 September 2006
The intensities of Raman-scattering bands in the spectrum of vitreous assigned to vibrations of intrinsic homopolar As-As ( ) and S-S ( ) bonds increase much more with the power of the exciting laser than does the principle vibrational band which is related to As-S-As glass-network vibrations ( ). In addition, the frequency of this glass-network vibration softens with an increase of the laser power. We ascribe these non-linear Raman effects to a photo-stimulated increase in polarizability of the homopolar bonds accompanied by softening of glass-network vibrations. It is suggested that this non-linearity is related to photodarkening in .
78.30.-j - Infrared and Raman spectra.
34.50.Rk - Laser-modified scattering and reactions.
42.70.Mp - Nonlinear optical crystals.
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