Title

Generation of Broad XUV Continuous High Harmonic Spectra and Isolated Attosecond Pulses with Intense Mid-Infrared Lasers

Abstract

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.

Department(s)

Physics

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)

0953-4075

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2012 IOP Publishing Ltd., All rights reserved.

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