Measurements of fluence profiles in femtosecond laser sparks and superfilaments in air
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Author
Samsonova, ZhannaKartashov, Daniil
Spielmann, Christian
Bodrov, Sergey
Murzanev, Aleksey
Jukna, Vytautas
Petrarca, Massimo

Couairon, Arnaud
Polynkin, Pavel
Affiliation
Univ Arizona, Coll Opt SciIssue Date
2018-06-20
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AMER PHYSICAL SOCCitation
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.97.063841Journal
PHYSICAL REVIEW ARights
© 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
2469-99262469-9934
Version
Final published versionSponsors
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 ArizonaAdditional Links
https://link.aps.org/doi/10.1103/PhysRevA.97.063841ae974a485f413a2113503eed53cd6c53
10.1103/PhysRevA.97.063841