title: Time-evolution of electron density in plasma measured by high-order harmonic generation.
abstract: We propose a new method of measuring the electron density in plasma by high-order harmonic generation (HHG) of intense two-color femtosecond (fs) laser. As the 800 nm fundamental beam is introduced after its second harmonic generation (SHG) beam, the recovery of HHG by the fundamental pulses at a delay of ~40 ps indicates the decay time of the generated plasma. The electron-ion recombination rate and electron density decay are revealed by fitting the harmonic emission to the model that accounts for depletion of neutral atoms, phase mismatch and re-absorption of HHG.
authors.affiliation: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Yang
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.forename: Haihe
authors.initials: H
authors.lastname: Lu
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Ge
authors.forename: Ruxin
authors.initials: R
authors.lastname: Li
authors.forename: Zhizhan
authors.initials: Z
authors.lastname: Xu
mesh_terms: D003198:Computer Simulation; D004579:Electron Transport; D004583:Electrons; D008956:Models, Chemical; D058626:Plasma Gases / Q000737:chemistry*; D012542:Scattering, Radiation
chemical_list: D058626:Plasma Gases