Generation of Broad XUV Continuous High Harmonic Spectra and Isolated Attosecond Pulses with Intense Mid-Infrared Lasers
We 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.
C. A. Trallero-Herrero and C. Jin and B. E. Schmidt and A. D. Shiner and J. Kieffer and P. B. Corkum and D. M. Villeneuve and C. D. Lin and F. Legare and A. Le, "Generation of Broad XUV Continuous High Harmonic Spectra and Isolated Attosecond Pulses with Intense Mid-Infrared Lasers," Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 45, no. 1, IOP Publishing Ltd., Jan 2012.
The definitive version is available at https://doi.org/10.1088/0953-4075/45/1/011001
Keywords and Phrases
Blue Shift; Carrier-Envelope Phase; Defocusing; Driving Field; Far Field; High Harmonics; High Order Harmonic Generation; Isolated Attosecond Pulse; Laser Intensities; Mid-Infrared Pulse; Mid-IR Lasers; Midinfrared Lasers; Molecular Species; Photon Energy; Spatial Filters, Atomic Spectroscopy; Harmonic Analysis; Infrared Devices; Infrared Lasers, Laser Pulses
International Standard Serial Number (ISSN)
Article - Journal
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