Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-00193-4
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Funding
- Air Force Office of Scientific Research [FA9550-12-1-0499, FA9550-14-1-0255]
- Center for Free-Electron Laser Science, DESY, Hamburg, Germany
- excellence cluster 'The Hamburg Centre for Ultrafast Imaging-Structure, Dynamics and Control of Matter at the Atomic Scale' of the Deutsche Forschungsgemeinschaft
- SERC from the Agency for Science, Technology and Research (A*STAR), Singapore [1426500050, 1426500051]
- NDSEG Graduate Fellowship
- Air Force Office of Scientific Research under MURI, Award [FA9550-16-1-0013]
- Ohio State University
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High-energy phase-stable sub-cycle mid-infrared pulses can provide unique opportunities to explore phase-sensitive strong-field light-matter interactions in atoms, molecules and solids. At the mid-infrared wavelength, the Keldysh parameter could be much smaller than unity even at relatively modest laser intensities, enabling the study of the strong-field sub-cycle electron dynamics in solids without damage. Here we report a high-energy sub-cycle pulse synthesiser based on a mid-infrared optical parametric amplifier and its application to high-harmonic generation in solids. The signal and idler combined spectrum spans from 2.5 to 9.0 mu m. We coherently synthesise the passively carrier-envelope phase-stable signal and idler pulses to generate 33 mu J, 0.88-cycle, multi-gigawatt pulses centred at similar to 4.2 mu m, which is further energy scalable. The mid-infrared sub-cycle pulse is used for driving high-harmonic generation in thin silicon samples, producing harmonics up to similar to 19th order with a continuous spectral coverage due to the isolated emission by the sub-cycle driver.
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