Nonlinear chirp combination effect on the improvement of high harmonic spectra and attosecond pulses

The chirp form selection for producing intense and broad high-order harmonic spectra has been investigated when the initial state is chosen to be the single or superposition states. It is found that, for the case of a single ground initial state, the down-chirp is much better for extending the harmonic cutoff with the stronger emission intensity. Moreover, the multi-color combined field is beneficial to produce the larger harmonic cutoff and higher harmonic intensity. After the control of laser waveform, the combination of 3-color down-chirps with a proper UV pulse is the best condition to obtain the intense X-ray spectral continuum and the isolated attosecond pulse. For the case of superposition initial state, both the up-chirp and down-chirp are beneficial to generate the high-intensity spectral regions. However, with the combination of multi-color field, only the harmonic cutoff can be further extended, and the harmonic intensity presents almost no changes for the superposition initial state case. Finally, by properly choosing the 3-color up-chirps or 3-color down-chirps combined pulses, the stronger intensity harmonic spectra covering the X-ray region can be obtained, which can produce the isolated pulses of 37 as.

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Nonlinear chirp combination effect on the improvement of high harmonic spectra and attosecond pulses

Cited by 2 publications

References 48 publications

Resonance-enhanced solid high-order harmonic generation by a chirped laser pulse

Resonance-enhanced solid high-order harmonic generation by a chirped laser pulse

Chirp form selection to produce intense and broad harmonic spectra and attosecond pulses in the presence of single and superposition initial states

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