Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5637
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Funding
- CNRS [PICS06038]
- RFBR [12-02-91059-NCNI a]
- European commission (EU program Laserlab Europe II and III) [GA-228334, GA-284464]
- ANR [ATTOWAVE ANR-09-BLAN-0031-02]
- region Aquitaine [COLA2 09010502, NASA 20101304005]
- French National Research Agency (ANR) in the frame of the Investments for the future Programme IdEx Bordeaux-LAPHIA [ANR-10-IDEX-03-02]
- Ministry of Education and Science of RF [MD-6596.2012.2]
- Dynasty Foundation
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A large international effort is nowadays devoted to increase the energy of the extreme ultraviolet pulses by using high-peak power ultrashort fundamental pulses (Terawatt level). Using such fundamental pulses brings specific constraints that need to be addressed. Here we study high-order harmonic generation in gases with 10 fs pulses at Terawatt peak power and demonstrate that extreme ultraviolet beams can be highly structured and complex in various conditions. We use a single-shot spatially resolved spectral detection and demonstrate direct observation of the spatio-temporal coupling occuring in the generating medium. Clear and reproducible complex spatio-spectral structures are observed in the far field. Similar structures are reproduced with simulations and we show that they are intimately associated to the high nonlinearity of high-order harmonic generation. Those findings are of prime importance for the generation of high-energy attosecond pulses and reveal important issues for their applications.
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