title: Broadband supercontinuum generation in air using tightly focused femtosecond laser pulses.
abstract: Supercontinuum generation in air using tightly focused femtosecond laser pulses was investigated experimentally. Broadband white-light emission covering the whole visible spectral region was generated. Spectral broadening extended only to the blue side of the fundamental frequency due to the phase modulation induced by the strong ionization of air. Numerical simulation was also performed to confirm the spectral broadening mechanism. A constant UV cutoff wavelength close to 400 nm was observed in the supercontinuum spectrum. This phenomenon indicated that intensity clamping still plays a role in tight focusing geometry.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Xiao-Long
authors.initials: XL
authors.lastname: Liu
authors.forename: Xin
authors.initials: X
authors.lastname: Lu
authors.forename: Xun
authors.initials: X
authors.lastname: Liu
authors.forename: Liu-Bin
authors.initials: LB
authors.lastname: Feng
authors.forename: Jing-Long
authors.initials: JL
authors.lastname: Ma
authors.forename: Yu-Tong
authors.initials: YT
authors.lastname: Li
authors.forename: Li-Ming
authors.initials: LM
authors.lastname: Chen
authors.forename: Quan-Li
authors.initials: QL
authors.lastname: Dong
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Wang
authors.forename: Zhao-Hua
authors.initials: ZH
authors.lastname: Wang
authors.forename: Zhi-Yi
authors.initials: ZY
authors.lastname: Wei
authors.forename: Zheng-Ming
authors.initials: ZM
authors.lastname: Sheng
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang