title: Elongation of femtosecond filament by molecular alignment in air.
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.
authors.affiliation: State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Cai
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.forename: Xueshi
authors.initials: X
authors.lastname: Bai
authors.forename: Heping
authors.initials: H
authors.lastname: Zeng
mesh_terms: D000388:Air; D001272:Atmosphere; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods; D004867:Equipment Design; D007834:Lasers; D055095:Optics and Photonics / Q000295:instrumentation* / Q000379:methods; D010825:Physics / Q000379:methods; D012542:Scattering, Radiation; D013997:Time Factors