Amplified spontaneous emission in the extreme ultraviolet by expanding xenon clusters

dc.citation.doi10.1103/PhysRevA.101.063412
dc.citation.issn2469-9926
dc.citation.issue6
dc.citation.jtitlePhysical Review A
dc.citation.volume101
dc.contributor.authorBenediktovitch, Andrei
dc.contributor.authorMercadier, Laurent
dc.contributor.authorPeyrusse, Olivier
dc.contributor.authorPrzystawik, Andreas
dc.contributor.authorLaarmann, Tim
dc.contributor.authorLangbehn, Bruno
dc.contributor.authorBomme, Cédric
dc.contributor.authorErk, Benjamin
dc.contributor.authorCorrea, Jonathan
dc.contributor.authorMossé, Caroline
dc.contributor.authorRolles, Daniel
dc.contributor.authorToleikis, Sven
dc.contributor.authorBucher, Maximilian
dc.contributor.authorBostedt, Christoph F. O.
dc.contributor.authorSanchez-Gonzalez, Alvaro
dc.contributor.authorDobrodey, Stepan
dc.contributor.authorBlessenohl, Michael A.
dc.contributor.authorNelde, Alexander
dc.contributor.authorMüller, Maria
dc.contributor.authorRupp, Daniela
dc.contributor.authorMöller, Thomas
dc.contributor.authorLópez-Urrutia, José R. Crespo
dc.contributor.authorRohringer, Nina
dc.date.accessioned2023-12-07T22:39:30Z
dc.date.available2023-12-07T22:39:30Z
dc.date.issued2020-06-22
dc.date.published2020-06-22
dc.description.abstractFocused short-wavelength free-electron laser (FEL) pulses interacting with gas phase samples can induce by inner-shell ionization a short-lived population inversion, followed by coherent collective emission of directed, short, and strong radiation bursts. We extend our studies into the warm-dense matter (WDM) regime by investigating the nanoplasmas produced in an ensemble of nanometer-sized clusters by FEL irradiation. Here, additional pathways can also lead to strong, laserlike emission: Electron-ion collisions can yield a long-lived population inversion, and subsequent amplified spontaneous emission. We observe amplified spontaneous emission (ASE) in the extreme ultraviolet in xenon clusters excited by soft x-ray FEL pulses, we diagnose the generated nanoplasmas by fluorescence spectroscopy, and we study under various cluster and FEL parameters the directed ASE from the Xe2+ 65 nm line. We show its exponential increase as a function of FEL irradiation power, and an accompanying collisional broadening of the emission spectra. These findings are corroborated by extensive numerical simulations based on theory, combining detailed hydrodynamic and kinetic simulations with time-dependent calculations of radiation transport, amplification, and collective emission in the WDM nanoplasma. Our theoretical findings underline that population inversion is due to electron-ion collisions and that the observed decoherence processes can be empirically characterized by a phenomenological decoherence time in the range of 100–200 fs.
dc.identifier.urihttps://hdl.handle.net/2097/44059
dc.relation.urihttps://link.aps.org/doi/10.1103/PhysRevA.101.063412
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dc.titleAmplified spontaneous emission in the extreme ultraviolet by expanding xenon clusters
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