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    Measurements of fluence profiles in femtosecond laser sparks and superfilaments in air

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    PhysRevA.97.063841.pdf
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    Author
    Samsonova, Zhanna
    Kartashov, Daniil
    Spielmann, Christian
    Bodrov, Sergey
    Murzanev, Aleksey
    Jukna, Vytautas
    Petrarca, Massimo cc
    Couairon, Arnaud
    Polynkin, Pavel
    Affiliation
    Univ Arizona, Coll Opt Sci
    Issue Date
    2018-06-20
    
    Metadata
    Show full item record
    Publisher
    AMER PHYSICAL SOC
    Citation
    Samsonova, Z., Kartashov, D., Spielmann, C., Bodrov, S., Murzanev, A., Jukna, V., ... & Polynkin, P. (2018). Measurements of fluence profiles in femtosecond laser sparks and superfilaments in air. Physical Review A, 97(6), 063841. https://doi.org/10.1103/PhysRevA.97.063841
    Journal
    PHYSICAL REVIEW A
    Rights
    © 2018 American Physical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We investigate the nonlinear propagation of multiterawatt femtosecond laser pulses at 800 nm wavelength in air, under different external focusing conditions. We profile the laser beam in the vicinity of the nonlinear focus using a technique based on the dependence of the single-shot ablation threshold for gold on the angle of incidence of the laser beam on the sample. Under very tight focusing conditions (f number similar to 15) we observe the propagation regime reminiscent of the nanosecond optical breakdown. No clear individual filaments are formed across the beam, and the estimated peak intensity surges to at least 200 TW/cm(2). As the external focusing is loosened to f number similar to 125, we observe the transition to the multifilamentation regime. Distinct individual filaments are formed before the linear focus while the peak intensity reaches similar to 80 TW/cm(2). Once formed, the filaments do not coalesce into a single or few superfilaments as they pass through the focus zone. Our experimental observations are supported by numerical simulations.
    ISSN
    2469-9926
    2469-9934
    DOI
    10.1103/PhysRevA.97.063841
    Version
    Final published version
    Sponsors
    U.S. Air Force Office of Scientific Research under MURI [FA9550-16-1-0013]; Laserlab-Europe Project [HIJ-FSU002344]; Friedrich-Schiller-Universitat Jena; University of Arizona
    Additional Links
    https://link.aps.org/doi/10.1103/PhysRevA.97.063841
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevA.97.063841
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