Abstract
Generation of high harmonics in a femtosecond laser field with intensity far exceeding the saturation intensity for optical field ionization is investigated. As the laser intensity was increased, the time of strong high harmonic generation became earlier. As an atom is exposed to a larger electric field variation duration the harmonic emission, the emitted harmonics experience a blueshift due to a non- adiabatic effect. In addition the high harmonic spectra shoed very complex structure, which was analyzed using a semi-classical theory based on the strong field approximation.
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