Generation of broad XUV continuous high harmonic spectra and isolated attosecond pulses with intense mid-infrared lasers

Details Generation of broad XUV continuous high harmonic spectra and isolated attosecond pulses with intense mid-infrared lasers Generation of broad XUV continuous high harmonic spectra and isolated attosecond pulses with intense mid-infrared lasers

2011-10-04

arxiv.org/abs/1110.0865v1

Physics

Atomic Physics

7 pages, 5 figures, submitted to J.Phys. B (Oct 2011)

Scientific paper

We present experimental results showing the appearance of a near-continuum in the high-order harmonic generation (HHG) spectra of atomic and molecular species as the driving laser intensity of an infrared pulse increases. Detailed macroscopic simulations reveal that these near-continuum spectra are capable of producing IAPs in the far field if a proper spatial filter is applied. Further, our simulations show that the near-continuum spectra and the IAPs are a product of strong temporal and spatial reshaping (blue shift and defocusing) of the driving field. This offers a possibility of producing IAPs with a broad range of photon energy, including plateau harmonics, by mid-IR laser pulses even without carrier-envelope phase stabilization.

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