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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 23 — Nov. 9, 2009
  • pp: 21060–21065

Elongation of femtosecond filament by molecular alignment in air

Hua Cai, Jian Wu, Hao Li, Xueshi Bai, and Heping Zeng  »View Author Affiliations


Optics Express, Vol. 17, Issue 23, pp. 21060-21065 (2009)
http://dx.doi.org/10.1364/OE.17.021060


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Abstract

We study the influence of the molecular alignment on the plasma channel length of femtosecond filament at 800 nm in air. The filament length is observed to be nearly doubled when the high-energy femtosecond laser pulse is properly tuned to match the perpendicular revivals of the molecular alignment, which is different from the low-energy femtosecond laser pulse where the filament is promoted for parallel molecular alignment revivals. These are understood to be the loosened or tightened focusing condition of the propagation of the femtosecond laser pulse by the cross-(de)focusing effect from the prealigned molecules.

© 2009 OSA

OCIS Codes
(260.5950) Physical optics : Self-focusing
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(020.2649) Atomic and molecular physics : Strong field laser physics

ToC Category:
Ultrafast Optics

History
Original Manuscript: September 21, 2009
Revised Manuscript: October 10, 2009
Manuscript Accepted: October 31, 2009
Published: November 4, 2009

Citation
Hua Cai, Jian Wu, Hao Li, Xueshi Bai, and Heping Zeng, "Elongation of femtosecond filament by molecular alignment in air," Opt. Express 17, 21060-21065 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-23-21060


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