Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms15626
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Funding
- Deutsche Forschungsgemeinschaft through excellence cluster 'The Hamburg Centre for Ultrafast Imaging (CUI)-Structure, Dynamics and Control of Matter at the Atomic Scale' [DFG-EXC1074]
- collaborative research centre 'Light-induced Dynamics and Control of Correlated Quantum Systems' [SFB925]
- Federal Ministry of Education and Research of Germany [05K16GU4]
- [GrK 1355]
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Light-phase-sensitive techniques, such as coherent multidimensional spectroscopy, are well-established in a broad spectral range, already spanning from radio-frequencies in nuclear magnetic resonance spectroscopy to visible and ultraviolet wavelengths in nonlinear optics with table-top lasers. In these cases, the ability to tailor the phases of electromagnetic waves with high precision is essential. Here we achieve phase control of extreme-ultraviolet pulses from a free-electron laser (FEL) on the attosecond timescale in a Michelson-type all-reflective interferometric autocorrelator. By varying the relative phase of the generated pulse replicas with sub-cycle precision we observe the field interference, that is, the light-wave oscillation with a period of 129 as. The successful transfer of a powerful optical method towards short-wavelength FEL science and technology paves the way towards utilization of advanced nonlinear methodologies even at partially coherent soft X-ray FEL sources that rely on self-amplified spontaneous emission.
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