Non-linear Raman effects and photodarkening in chalcogenide glass As₂S₃

V.K. Tikhomirov (1, 2, 3, 4) , M. Barj (1, 4) , S. Turrell (1, 4) , J. Kobelke (5) , N. Idrissi (1, 4) , M. Bouazaoui (2) , B. Capoen (2) , A.B. Seddon (3)

1 LASIRE - Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516
2 PhLAM - Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523
3 Novel Photonic Glasses Research Group
4 CERLA - Centre d'Etudes et de Recherches Lasers et Applications
5 Institute for High Physical Technology

The intensities of Raman-scattering bands in the spectrum of vitreous As2S3 assigned to vibrations of intrinsic homopolar As-As ( ~ 234 cm-1) and S-S ( ~ 490 cm-1) 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 ( ~ 343 cm-1). 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 As2S3.

V.K. Tikhomirov, M. Barj, S. Turrell, J. Kobelke, N. Idrissi, et al.. Non-linear Raman effects and photodarkening in chalcogenide glass As₂S₃. EPL - Europhysics Letters, 2006, 76, pp.312-317. ⟨10.1209/epl/i2006-10272-8⟩. ⟨hal-00268058⟩