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Physics of Plasmas / Volume 12 / Issue 5 / INVITED PAPERS / Lasers, Particle Beams, Accelerators, Radiation Generation

Phys. Plasmas 12, 056705 (2005); http://dx.doi.org/10.1063/1.1871197 (7 pages)

Measurements of intense femtosecond laser pulse propagation in air a

a Paper FI2 2, Bull. Am. Phys. Soc. 49, 136 (2004).
A. Ting, I. Alexeev, D. Gordon, R. Fischer, D. Kaganovich, T. Jones, E. Briscoe, J. Peñano, R. Hubbard, and P. Sprangle

Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375

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(Received 18 November 2004; accepted 10 January 2005; published online 7 April 2005)

The nonlinear self-focusing of an intense femtosecond pulse propagating in air can be balanced by the plasma defocusing as the laser intensity is increased above the threshold for multiphoton ionization. The resultant laser∕plasma filament can extend many meters, suitable for many applications such as remote atmospheric breakdown, laser induced electrical discharge, and femtosecond laser material interactions. Direct (bore-sight) measurements of filament size and fluence over 4 m showed a preservation of the total energy in the filament during propagation. This indicates the energy lost in creating the central plasma column through multiphoton ionization was continuously being replenished from the surrounding radiation. Electrical measurement of the filament conductivity estimated the plasma density to be 1×1016 cm−3 and electrical discharges triggered by a femtosecond laser filament were found to occur at substantially reduced breakdown fields.

© 2005 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL SETUP
  3. LONGITUDINAL VARIATIONS OF FILAMENT SIZE AND ENERGY
  4. ELECTRICAL CONDUCTIVITY IN LASER FILAMENTS AND INDUCED ELECTRICAL DISCHARGES
  5. CONCLUSIONS

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KEYWORDS and PACS

Keywords

air, plasma light propagation, plasma diagnostics, plasma nonlinear processes, optical self-focusing, multiphoton processes, photoionisation, high-speed optical techniques, plasma production by laser, electrical conductivity, plasma density, discharges (electric)

PACS

  • 52.38.Hb

    Self-focussing, channeling, and filamentation in plasmas

  • 52.38.Dx

    Laser light absorption in plasmas (collisional, parametric, etc.)

  • 52.25.Jm

    Ionization of plasmas

  • 52.35.Mw

    Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)

  • 52.50.Jm

    Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)

  • 52.70.Kz

    Optical (ultraviolet, visible, infrared) measurements

  • 52.70.Ds

    Electric and magnetic measurements

  • 52.80.-s

    Electric discharges

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1871197

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    P. Sprangle, J. R. Peñano, and B. Hafizi, Phys. Rev. E 66, 046418 (2002).

    I. Alexeev, A. Ting, D. F. Gordon, E. Briscoe, J. R. Peñano, R. F. Hubbard, and P. Sprangle, Appl. Phys. Lett. 84, 4080 (2004)APPLAB000084000020004080000001.

    B. La Fontaine, F. Vidal, Z. Jiang, C. Chien, D. Comtois, A. Desparois, T. Johnston, J.-C. Kieffer, H. Pepin, and H. Mercure, Phys. Plasmas 6, 1615 (1999)PHPAEN000006000005001615000001.

    S. Tzortzakis, M. A. Franco, Y.-B. Andre, A. Chiron, B. Lamouroux, B. S. Prade, and A. Mysyrowicz, Phys. Rev. E 60, R3505 (1999).

    D. F. Gordon, A. Ting, R. F. Hubbard, E. Briscoe, C. Manka, S. P. Slinker, A. P. Baronavski, H. D. Ladouceur, P. W. Grounds, and P. G. Girardi, Phys. Plasmas 10, 4530 (2003)PHPAEN000010000011004530000001.


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