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  • Title: Time-evolution of electron density in plasma measured by high-order harmonic generation.
    Author: Yang H, Liu P, Lu H, Ge X, Li R, Xu Z.
    Journal: Opt Express; 2012 Aug 13; 20(17):19449-54. PubMed ID: 23038587.
    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.
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