Journal
OPTICS EXPRESS
Volume 22, Issue 19, Pages 22905-22916Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.022905
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Funding
- Deutsche Forschungsgemeinschaft [KO 3798/3-1]
- Cluster of Excellence QUEST, Centre for Quantum Engineering and Space-Time Research
- Open Access Publishing Fund of Leibniz Universitat Hannover
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We report on the direct experimental observation of pulse-splitting dynamics along a femtosecond filament. The fundamental pulse experiences a significant self-shortening during the propagation leading to pulse durations of 5.3 fs, corresponding to sub-3 cycles, which is measured without external pulse compression. A compression factor of eight could be achieved in a single filamentary stage. Theoretical modeling of the fundamental pulse propagation confirms our observed pulse structures and durations and gives further insight into the nonlinear dynamics during filamentation. (C) 2014 Optical Society of America
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