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arXiv · 1110.0865

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

C. Trallero-Herrero·C. Jin·B. E. Schmidt·A. D. Shiner·J-C. Kieffer·P. B. Corkum·D. M. Villeneuve·C. D. Lin·F. Légaré·A-T. Le
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Abstract

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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C. Trallero-Herrero, C. Jin, B. E. Schmidt, A. D. Shiner, J-C. Kieffer, P. B. Corkum, D. M. Villeneuve, C. D. Lin, F. Légaré, A-T. Le. 2011-10-04. Generation of broad XUV continuous high harmonic spectra and isolated attosecond pulses with intense mid-infrared lasers. https://doi.org/10.1088/0953-4075/45/1/011001

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