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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 31, Iss. 4 — Apr. 1, 2014
  • pp: 788–797

Single and multiple filamentation of multi-terawatt CO2-laser pulses in air: numerical simulations

Y. E. Geints and A. A. Zemlyanov  »View Author Affiliations


JOSA B, Vol. 31, Issue 4, pp. 788-797 (2014)
http://dx.doi.org/10.1364/JOSAB.31.000788


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Abstract

We numerically simulated the nonlinear propagation of high-power subpicosecond laser radiation at 10.6 μm carrier wavelength in air under conditions of pulse Kerr self-focusing and single and multiple filamentation. For the first time, to the best of our knowledge, we show that in contrast to the well-known femtosecond pulse filamentation in the near-infrared domain (800 nm), the self-action of mid-infrared radiation is characterized by the formation of millimeter-wide filaments accompanied by nearly continuous along the propagation direction and elongated plasma columns. The physical cause is the change of the air ionization regime by the CO2-laser pulse in favor of impact ionization and electron avalanche development. This alters the character of plasma influence on the laser radiation by enhancing the role of physical processes attributed to the liberated hot electrons.

© 2014 Optical Society of America

OCIS Codes
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(190.5940) Nonlinear optics : Self-action effects
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(260.5210) Physical optics : Photoionization

ToC Category:
Nonlinear Optics

History
Original Manuscript: January 14, 2014
Revised Manuscript: February 12, 2014
Manuscript Accepted: February 12, 2014
Published: March 13, 2014

Citation
Y. E. Geints and A. A. Zemlyanov, "Single and multiple filamentation of multi-terawatt CO2-laser pulses in air: numerical simulations," J. Opt. Soc. Am. B 31, 788-797 (2014)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-31-4-788

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