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Decreasing ultrafast x-ray pulse durations with saturable absorption and resonant transitions
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kemisk och biomolekylär fysik.ORCID-id: 0000-0003-0707-1832
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2023 (engelsk)Inngår i: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 107, nr 1, artikkel-id 015205Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Saturable absorption is a nonlinear effect where a material's ability to absorb light is frustrated due to a high influx of photons and the creation of electron vacancies. Experimentally induced saturable absorption in copper revealed a reduction in the temporal duration of transmitted x-ray laser pulses, but a detailed account of changes in opacity and emergence of resonances is still missing. In this computational work, we employ nonlocal thermodynamic equilibrium plasma simulations to study the interaction of femtosecond x rays and copper. Following the onset of frustrated absorption, we find that a K–M resonant transition occurring at highly charged states turns copper opaque again. The changes in absorption generate a transient transparent window responsible for the shortened transmission signal. We also propose using fluorescence induced by the incident beam as an alternative source to achieve shorter x-ray pulses. Intense femtosecond x rays are valuable to probe the structure and dynamics of biological samples or to reach extreme states of matter. Shortened pulses could be relevant for emerging imaging techniques.

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American Physical Society (APS) American Physical Society, 2023. Vol. 107, nr 1, artikkel-id 015205
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Identifikatorer
URN: urn:nbn:se:uu:diva-495128DOI: 10.1103/physreve.107.015205ISI: 000923229600007OAI: oai:DiVA.org:uu-495128DiVA, id: diva2:1730426
Forskningsfinansiär
Swedish Research Council, 2019-03935Swedish Research Council, 2018-00740German Research Foundation (DFG), 390715994Tilgjengelig fra: 2023-01-24 Laget: 2023-01-24 Sist oppdatert: 2024-01-15bibliografisk kontrollert

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Cardoch, SebastianCaleman, CarlTimneanu, Nicusor

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Cardoch, SebastianTrost, FabianScott, Howard A.Chapman, Henry N.Caleman, CarlTimneanu, Nicusor
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