Journal
OPTICS EXPRESS
Volume 20, Issue 21, Pages 24049-24058Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.024049
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Funding
- Deutsche Forschungsgemeinschaft within the Cluster of Excellence QUEST, Centre for Quantum Engineering and Space-Time Research
- [PA 730/4]
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The temporal dynamics of ultrashort laser pulses undergoing filamentary propagation are investigated with a real-time stereographic above-threshold ionization (ATI) phasemeter. The experimental setup is capable of measuring the pulse duration as well as the carrier-envelope phase distribution of pulses originating from a femtosecond filament, which is either truncated in length or fully propagated. Truncation, by means of a semi-infinite gas cell, allows to elucidate the nonlinear evolution and temporal dynamics of ultrashort laser pulses as a function of the propagation length. We observe the formation of few-cycle pulses as well as temporal pulse splitting dynamics during the propagation of the pulse inside the filament. For the first time, we demonstrate the compression of 35 fs pulses down to a duration of sub-4 fs in a single femtosecond filament. This corresponds to sub-1.5 cycles of the electric field. (C) 2012 Optical Society of America
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