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Harmonic generation by an intense laser pulse in neutral and ionized gases

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4 Author(s)
Liu, X. ; Center for Ultrafast Opt. Sci., Michigan Univ., Ann Arbor, MI, USA ; Umstadter, D. ; Esarey, E. ; Ting, A.

Reported are the results of a harmonic generation experiment in a simple gas (hydrogen) using 1-ps, 1-μm laser pulses with a range of intensities extending from below to far above the laser ionization saturation threshold. The scaling with intensity above saturation of the third harmonic generated by a single laser-pulse in a filled gas cell is observed not to fit with a simple model that takes into consideration volume ionization effects alone. In another experiment, a pump-probe type, an upper limit on the conversion efficiency of third-harmonic generation in a preformed plasma is determined. It is found to be in agreement with the efficiency predicted by a relativistic harmonic generation theory

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Plasma Science, IEEE Transactions on  (Volume:21 ,  Issue: 1 )