title: Generation of extended filaments of femtosecond pulses in air by use of a single-step phase plate.
abstract: We experimentally demonstrate that by use of a phase plate that is placed between an adjustable aperture and a focusing lens, the length of the filament can be dramatically extended in air with a femtosecond laser pulse. In addition, the far-field beam profile captured after the filament indicates that the supercontinuum is strongly confined on axis, and a single filament appears to be attainable at relatively high input pulse power when the phase plate is used.
authors: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, China.
authors: Yuxi
authors: Y
authors: Fu
authors: Hui
authors: H
authors: Xiong
authors: Han
authors: H
authors: Xu
authors: Jinping
authors: J
authors: Yao
authors: Bin
authors: B
authors: Zeng
authors: Wei
authors: W
authors: Chu
authors: Ya
authors: Y
authors: Cheng
authors: Zhizhan
authors: Z
authors: Xu
authors: Weiwei
authors: W
authors: Liu
authors: See Leang
authors: SL
authors: Chin