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Phys Rev Lett. 2010 Oct 22;105(17):173901. Epub 2010 Oct 19.

Bright, coherent, ultrafast soft X-ray harmonics spanning the water window from a tabletop light source.

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1
JILA, University of Colorado at Boulder, 80309-0440, USA.

Abstract

We demonstrate fully phase-matched high harmonic emission spanning the water window spectral region important for nano- and bioimaging and a breadth of materials and molecular dynamics studies. We also generate the broadest bright coherent bandwidth (≈300  eV) to date from any light source, small or large, that is consistent with a single subfemtosecond burst. The harmonic photon flux at 0.5 keV is 10³ higher than demonstrated previously. This work extends bright, spatially coherent, attosecond pulses into the soft x-ray region for the first time.

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