Shadowgraphic imaging of carbon nanotube suspensions in water and in chloroform

L. Vivien 1 J. Moreau 1 D. Riehl 1 P.A. Alloncle 2 M. Autric 2 François Hache 3, * E. Anglaret 4
* Corresponding author
1 Department Laser, Optique et Thermo-optique
2 IRPHE - Institut de Recherche sur les Phénomènes Hors Equilibre
3 LOB - Laboratoire d'optique et biosciences
4 GDPC - Groupe de Dynamique des Phases Condensées
Abstract : Carbon nanotube suspensions are known to display interesting optical limiting properties as a result of the formation of solvent or carbon-vapor bubbles that scatter the laser beam. In this study we present an original experiment that permits direct observation of the changes that occur in the focal zone in carbon nanotube suspensions by using a shadowgraphic experiment coupled with a monochromatic pump-probe experiment. We have observed a clear correlation between the radius of the scattering centers and the evolution in transmittance of the sample. We compared bubble growth in chloroform and water and found good agreement with previously obtained results. We also observed the presence of compression waves, which propagate parallel to the laser beam and can produce secondary cavitation phenomena after reflection on the cell walls. Cop. 2002 Optical Society of America.
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L. Vivien, J. Moreau, D. Riehl, P.A. Alloncle, M. Autric, et al.. Shadowgraphic imaging of carbon nanotube suspensions in water and in chloroform. Journal of the Optical Society of America B, Optical Society of America, 2002, 19 (11), pp.2665. ⟨10.1364/JOSAB.19.002665⟩. ⟨hal-00836942⟩

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