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APS » Journals » Phys. Rev. A » Volume 71 » Issue 4
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Phys. Rev. A 71, 045401 (2005) [4 pages]

Enhanced fragmentation of toluene through linear and nonlinear increase of the focal spot area of an ultrashort laser pulse

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X. P. Tang1, A. Becker2, W. Liu1,2, M. Sharifi1, O. Kosareva3, V. P. Kandidov3, P. Agostini1,4,5, and S. L. Chin1
1Centre d’Optique, Photonique et Laser (COPL) and Département de Physique de Génie Physique et d’Optique, Université Laval, Québec, Québec, Canada G1K 7P4
2Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden, Germany
3International Laser Center, Department of Physics, Moscow State University, Moscow 119899, Russia
4Comissariat à l’Energie Atomique, DSM, Centre d’Etudes de Saclay, 91191 Gif-sur-Yvette, France
5Max-Born-Institut, Max-Born-Strasse 2a, D-12489 Berlin, Germany

Received 9 August 2004; revised 22 December 2004; published 1 April 2005

Toluene fragmentation by intense femtosecond laser pulses is experimentally investigated. A strong increase of the toluene fragmentation appears to correlate with an increase of the focal area due to changes in the focal geometry and nonlinear small-scale self-focusing. The scenario of Raman modes excitation proposed in an earlier publication [ A.M. Müller et al. Phys. Rev. Lett. 88 023001 (2002)] is ruled out as the dominant effect for the enhancement.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.71.045401
DOI:
10.1103/PhysRevA.71.045401
PACS:
33.80.−b, 33.80.Rv, 42.65.−k
 
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