Damping of the tunneling mechanism in high-order harmonic generation processes induced by femtosecond visible laser pulses

Simoncig, A.; Caretta, A.; Ressel, B.; Poletto, L.; Parmigiani, F.
July 2009
Applied Physics Letters;7/27/2009, Vol. 95 Issue 4, p041107
Academic Journal
The high-order harmonic generation (HHG) of coherent light pulses in gases is strictly dependent on the ionization dynamics that delocalizes the electron wave function in the laser field continuum. Here we report on the investigation of such dynamics by varying the energy of a 400 nm, 60 fs driving laser pulse. The experimental data provide the unambiguous evidence of a hybrid dynamical region, not described by the full-tunneling approximation models, where the HHG photon number exponentially decays when the Keldysh parameter is varied from 1 to 3. Finally, a phenomenological model, suitable to account for this hybrid regime, is reported.


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