Generation of Nonadiabatic Blueshift of High Harmonics in an Intense Femtosecond Laser Field
- 27 September 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 83 (13) , 2544-2547
- https://doi.org/10.1103/physrevlett.83.2544
Abstract
By applying intense 30-fs Ti:sapphire laser pulses to Ar gas well above the saturation intensity for optical-field ionization, a strong blueshift of high harmonics 2 times as large as the laser frequency was generated. A semiclassical calculation showed that the observed large blueshift resulted from a rapidly increasing electric field, existing much earlier in time than the peak of the laser pulse, i.e., a nonadiabatic effect.Keywords
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