C Trallero-Herrero et al 2012 J. Phys. B: At. Mol. Opt. Phys. 45 011001 doi:10.1088/0953-4075/45/1/011001
C Trallero-Herrero1,2, Cheng Jin1, B E Schmidt3, A D Shiner2, J-C Kieffer3, P B Corkum2, D M Villeneuve2, C D Lin1, F Légaré3 and A T Le1
Show affiliationsWe present experimental results showing the appearance of a near-continuum in the high-order harmonic generation spectra of atomic and molecular species as the driving laser intensity of a mid-infrared pulse increases. Detailed macroscopic simulations reveal that these near-continuum spectra are capable of producing isolated attosecond pulses (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 the 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.
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
32.30.Jc Visible and ultraviolet spectra
33.70.Jg Line and band widths, shapes, and shifts
32.70.Jz Line shapes, widths, and shifts
32.80.Fb Photoionization of atoms and ions
33.80.Eh Autoionization, photoionization, and photodetachment
Issue 1 (14 January 2012)
Received 5 October 2011, in final form 5 November 2011
Published 9 December 2011
C Trallero-Herrero et al 2012 J. Phys. B: At. Mol. Opt. Phys. 45 011001
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