EPJ Web of Conferences
Volume 41, 2013XVIIIth International Conference on Ultrafast Phenomena
|Number of page(s)||3|
|Section||Novel Pulsed Sources: Oscillators, Amplifiers, Nonlinear Mixing, Electrons, X-Rays|
|Published online||13 March 2013|
Intense, directional UV emission from molecular nitrogen ions in an adaptively controlled femtosecond filament
1 Photonics Institute, Vienna University of Technology, A-1040 Vienna, Austria
2 Physikalisch-Chemisches Institut, University Heidelberg, D-69120 Heidelberg, Germany
3 Department of Physics and Astronomy, Texas A&M University, College Station TX, USA
4 Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, 119992 Moscow, Russia
Using phase-shaped millijoule 1030-nm femtosecond pulses generating a filament in a cell filled with N2, we obtain intense forward UV emission between vibrational manifolds of B2Σ and X2Σ states of N2+ for optimal pulse sequences. The effect is tentatively ascribed to wave-mixing between intense NIR pulses and weak supercontinuum components, resonant to the UV transitions, whereby a non-instantaneous nonlinear susceptibility is linked to rotational coherence in ions.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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