High harmonic generation with sub-cycle pulses
Zheng, Jian; Qiu, Enming; Lin, Qiang; Zheng, Jian; Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310027, People’s Republic of China; Qiu, Enming; Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310027, People’s Republic of China; Lin, Qiang; Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310027, People’s Republic of China
Журнал:
Journal of Optics
Дата:
2011-07-01
Аннотация:
The high harmonic spectra of atomic hydrogen illuminated by an intense sub-cycle pulse are studied. A reduction of the cutoff energy occurs as the pulse width goes down to sub-cycle. The amount of the reduction is envelope dependent. The blueshift of the center frequency is considered to be the cause of the reduction. The generated high harmonic spectrum is found to be closely related to the intrinsic chirp of the pulse. The expressions used in this study for ultrashort pulses with arbitrary envelopes have been derived from the oscillating dipole model.
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