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Extreme Ultraviolet Superfluorescence in Xenon and Krypton

MPS-Authors
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Mercadier,  L.
Quantum Optics with X-Rays, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
European XFEL;

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Weninger,  C.
Quantum Optics with X-Rays, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Majety,  V. P.
Quantum Optics with X-Rays, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Rohringer,  N.
Quantum Optics with X-Rays, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Deutsches Elektronen-Synchrotron (DESY);
Department of Physics, Universität Hamburg;

Fulltext (public)

1810.11097.pdf
(Preprint), 5MB

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Citation

Mercadier, L., Benediktovitch, A., Weninger, C., Blessenohl, M. A., Bernitt, S., Bekker, H., et al. (2018). Extreme Ultraviolet Superfluorescence in Xenon and Krypton.


Cite as: http://hdl.handle.net/21.11116/0000-0002-6D50-A
Abstract
We present a comprehensive experimental and theoretical study on superfluorescence in the extreme ultraviolet wavelength regime. Focusing a high-intensity free-electron laser pulse in a cell filled with Xe or Kr gas, the medium is quasi instantaneously population-inverted by inner-shell ionization on the giant resonance followed by Auger decay. On the timescale of 100 ps a macroscopic polarization builds up in the medium, resulting in superfluorescent emission of several Xe and Kr lines in the forward direction. As the number of emitters in the system is increased by either raising the pressure or the pump-pulse energy, the emission shows an exponential growth of over 4 orders of magnitude and reaches saturation. With increasing yield, we observe line broadening, a manifestation of superfluorescence in the spectral domain. Our novel theoretical approach, based on a full quantum treatment of the atomic system and the irradiated field, shows quantitative agreement with the experiment and supports our interpretation.