Amplified spontaneous emission in the extreme ultraviolet by expanding xenon clusters

Benediktovitch, Andrei; Mercadier, Laurent; Peyrusse, Olivier; Przystawik, Andreas; Laarmann, Tim; Langbehn, Bruno; Bomme, Cédric; Erk, Benjamin; Correa, Jonathan; Mossé, Caroline; Rolles, Daniel; Toleikis, Sven; Bucher, Maximilian; Bostedt, Christoph F. O.; Sanchez-Gonzalez, Alvaro; Dobrodey, Stepan; Blessenohl, Michael A.; Nelde, Alexander; Müller, Maria; Rupp, Daniela; Möller, Thomas; López-Urrutia, José R. Crespo; Rohringer, Nina

doi:10.1103/PhysRevA.101.063412

Amplified spontaneous emission in the extreme ultraviolet by expanding xenon clusters

Journal Article · Mon Jun 22 00:00:00 EDT 2020 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.101.063412· OSTI ID:1634219

^[1]; Mercadier, Laurent ^[2]; Peyrusse, Olivier ^[3]; Przystawik, Andreas ^[4]; ^[5]; ^[6]; Bomme, Cédric ^[4]; ^[4]; Correa, Jonathan ^[4]; Mossé, Caroline ^[3]; ^[7]; Toleikis, Sven ^[4]; ^[8]; Bostedt, Christoph F. O. ^[9]; ^[10]; Dobrodey, Stepan ^[11]; ^[11]; ^[6]; Müller, Maria ^[6]; ^[12] more »

Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Kansas State University
European XFEL GmbH, Schenefeld (Germany)
Aix-Marseille Univ. (France)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Centre for Ultrafast Imaging CUI, Hamburg (Germany)
Technische Univ. Berlin (Germany)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Kansas State Univ., Manhattan, KS (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Imperial College, London (United Kingdom)
Max-Plank-Inst. für Kernphysik, Heidelberg (Germany)
Technische Univ. Berlin (Germany); ETH Zurich (Switzerland)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Univ. Hamburg (Germany)

Focused 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. Furthermore, 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.

View Accepted Manuscript (DOE)

Research Organization:: Kansas State Univ., Manhattan, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: FG02-86ER13491

OSTI ID:: 1634219

Alternate ID(s):: OSTI ID: 1647292

Journal Information:: Physical Review A, Journal Name: Physical Review A Journal Issue: 6 Vol. 101; ISSN PLRAAN; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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Amplified spontaneous emission in the extreme ultraviolet by expanding xenon clusters

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