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Multiple filamentation of non-uniformly focused ultrashort laser pulses

Hao, Z. ; Salamé, R. ; Lascoux, N. ; Salmon, E. ; Maioli, P. ; Kasparian, J. ; Wolf, J.-P

In: Applied Physics B, 2009, vol. 94, no. 2, p. 243-247

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    Title
    • Multiple filamentation of non-uniformly focused ultrashort laser pulses
    Author
    • Hao, Z.. Université de Lyon, Lyon Cedex 07, France
    • Salamé, R.. Université de Lyon, Lyon Cedex 07, France
    • Lascoux, N.. Université de Lyon, Lyon Cedex 07, France
    • Salmon, E.. Université de Lyon, Lyon Cedex 07, France
    • Maioli, P.. Université de Lyon, Lyon Cedex 07, France
    • Kasparian, J.. Université de Lyon, Lyon Cedex 07, France
    • Wolf, J.-P. GAP-Biophotonics, University of Geneva, 20 rue de l'École de Médecine, 1211, Geneva, Switzerland
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:319774
    Summary
    We propose the impingement of non-uniform wavefront curvature as a simple way to improve the longitudinal homogeneity of the plasma density along filaments generated by ultrashort laser pulses. We characterize multiple filamentation of a multiterawatt beam with different wavefront curvatures applied to specific regions in the transverse beam profile. In adequate conditions, the filamenting region is more homogeneously ionized, in the longitudinal direction, than in the case of uniform focusing. Moreover, the ionization maximum is located between the middle and the two thirds of the filaments in all investigated chirps and focus configurations