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Title: Picosecond laser filamentation in air

Authors:
; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1315843
Alternate Identifier(s):
OSTI ID: 1315844
Grant/Contract Number:
AC52-07NA27344; 2015-056129; 2016-057594
Resource Type:
Journal Article: Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 18; Journal Issue: 9; Related Information: CHORUS Timestamp: 2017-06-24 17:53:37; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Schmitt-Sody, Andreas, Kurz, Heiko G., Bergé, Luc, Skupin, Stefan, and Polynkin, Pavel. Picosecond laser filamentation in air. United Kingdom: N. p., 2016. Web. doi:10.1088/1367-2630/18/9/093005.
Schmitt-Sody, Andreas, Kurz, Heiko G., Bergé, Luc, Skupin, Stefan, & Polynkin, Pavel. Picosecond laser filamentation in air. United Kingdom. doi:10.1088/1367-2630/18/9/093005.
Schmitt-Sody, Andreas, Kurz, Heiko G., Bergé, Luc, Skupin, Stefan, and Polynkin, Pavel. Thu . "Picosecond laser filamentation in air". United Kingdom. doi:10.1088/1367-2630/18/9/093005.
@article{osti_1315843,
title = {Picosecond laser filamentation in air},
author = {Schmitt-Sody, Andreas and Kurz, Heiko G. and Bergé, Luc and Skupin, Stefan and Polynkin, Pavel},
abstractNote = {},
doi = {10.1088/1367-2630/18/9/093005},
journal = {New Journal of Physics},
number = 9,
volume = 18,
place = {United Kingdom},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1088/1367-2630/18/9/093005

Citation Metrics:
Cited by: 4works
Citation information provided by
Web of Science

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  • We attribute a strong forward directed THz emission from femtosecond laser filaments in air to a transition-Cherenkov emission from the plasma space charge moving behind the ionization front at light velocity. Distant targets can be easily irradiated by this new source of THz radiation.
  • Filaments created in air by an intense femtosecond laser pulse in the presence of an electric field generate a highly conductive permanent plasma column.
  • An impulsive, femtosecond filament-based Raman technique producing high quality Raman spectra over a broad spectral range (1554.7-4155 cm{sup -1}) is presented. The temperature of gas phase molecules can be measured by temporally resolving the dispersion of impulsively excited vibrational wave packets. Application to laser-induced filamentation in air reveals that the initial rovibrational temperature is 300 K for both N{sub 2} and O{sub 2}. The temperature-dependent wave-packet dynamics are interpreted using an analytic anharmonic oscillator model. The wave packets reveal a 1/e dispersion time of 3.9 ps for N{sub 2} and 2.8 ps for O{sub 2}. Pulse self-compression of temporal featuresmore » to 8 fs within the filament is directly measured by impulsive vibrational excitation of H{sub 2}.« less
  • Peculiarities of the self-focusing and filamentation of high-power femtosecond laser pulses in air have been experimentally and theoretically studied under conditions of broad variation of the beam focusing parameter. The influence of the numerical aperture (NA) of the initial radiation focusing on the main characteristics of laser-induced plasma columns (characteristic transverse size, length, and concentration of free electrons) is considered. It is established that, for a rigid (NA > 0.05) initial laser beam focusing, the transverse size of the plasma channel ceases to decrease at a level of R{sub pl} {approx} 2-4 {mu}m as a result of strong refraction ofmore » radiation on the plasma formed at the focal waist, which prevents further contraction of the laser beam due to its focusing and self-focusing.« less