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.

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

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Author Affiliations

Jian Wu, Hao Li, Xueshi Bai, Heping Zeng

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

Hua Cai

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, Chinajwu@phy.ecnu.edu.cn

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