Spatio-temporal isolation of attosecond soft X-ray pulses in the water window

Abstract

We demonstrate experimentally the isolation of single attosecond pulses at the carbon K- shell edge in the soft-X-ray water window. Attosecond pulses at photon energies that cover the principal absorption edges of the building blocks of materials are a prerequisite for time resolved probing of the triggering events leading to electronic dynamics such as exciton formation and annihilation. Herewith, we demonstrate successful isolation of individual attosecond pulses at the carbon K edge (284 eV) with a pulse duration below 400 as and with a bandwidth supporting a 30 as pulse duration. Our approach is based on spatio-temporal isolation of ponderomotively shifted harmonics and validates a straightforward and scalable approach for robust and reproducible attosecond pulse isolation.

References in corpus (3)

• Bright Coherent Ultrahigh Harmonics in the keV X-Ray Regime from Mid-Infrared Femtosecond Lasers
• Phase matching of high harmonic generation in the soft and hard X-ray regions of the spectrum
• Quantitative Rescattering Theory for high-order harmonic generation from molecules

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• Apparatus for generation of nanojoule-class water-window high-order harmonics