Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic

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dc.contributor.author Kroh, Tobias
dc.contributor.author Jin, Cheng
dc.contributor.author Krogen, Peter
dc.contributor.author Keathley, Philip D.
dc.contributor.author Calendron, Anne-Laure
dc.contributor.author Siqueira, Jonathas P.
dc.contributor.author Liang, Houkun
dc.contributor.author Falcão-Filho, Edilson L.
dc.contributor.author Lin, C. D.
dc.contributor.author Kärtner, Franz X.
dc.contributor.author Hong, Kyung-Han
dc.date.accessioned 2019-04-17T14:12:57Z
dc.date.available 2019-04-17T14:12:57Z
dc.date.issued 2018-06-25
dc.identifier.uri http://hdl.handle.net/2097/39545
dc.description Citation: Kroh, T., Jin, C., Krogen, P., Keathley, P. D., Calendron, A.-L., Siqueira, J. P., … Hong, K.-H. (2018). Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic. Optics Express, 26(13), 16955–16969. https://doi.org/10.1364/OE.26.016955
dc.description.abstract We systematically study the efficiency enhancement of high-harmonic generation (HHG) in an Ar gas cell up to the soft X-ray (SXR) range using a two-color laser field composed of 2.1 μm (ω) and 700 nm (3ω) with parallel linear polarization. Our experiment follows the recent theoretical investigations that determined two-color mid-infrared (IR) pulses, mixed with their third harmonic (ω + 3ω), to be close to optimal driving waveforms for enhancing HHG efficiency in the SXR region [Jin et al., Nature Comm. 5, 4003 (2014)]. We observed sub-optical-cycle-dependent efficiency enhancements of up to 8.2 of photon flux integrated between 20 – 70 eV, and up to 2.2 between 85 – 205 eV. Enhancement of HHG efficiency was most pronounced for the lowest tested backing pressure (≈ 140 mbar), and decreased monotonically as the pressure was increased. The single-color (ω)-driven HHG was optimal at the highest backing pressure tested in the experiment (≈ 375 mbar). Our numerical simulations based on single-atom response and 3D pulse propagation show good qualitative agreement with experimental observations. The lower enhancement at high pressure and higher photon energy indicates that phase matching of two-color-driven HHG is more sensitive to ionization rate and pulse propagation effects than the single-color case. We show that with further improvements to the relative phase jitter and the spatio-temporal overlap of the two beams, the efficiency enhancement could be further improved by at least a factor of ≈ 2.
dc.language.iso en_US
dc.relation.uri https://doi.org/10.1364/OE.26.016955
dc.rights © 2018 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
dc.rights.uri http://rightsstatements.org/vocab/InC/1.0/
dc.rights.uri https://doi.org/10.1364/OA_License_v1
dc.subject Harmonic generation and mixing
dc.subject Soft x-rays
dc.subject Strong field laser physics
dc.subject Ultraviolet
dc.title Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic
dc.type Text
dc.date.published 2018
dc.citation.doi 10.1364/OE.26.016955
dc.citation.issn 1094-4087
dc.citation.issue 13
dc.citation.jtitle Optics Express
dc.citation.volume 26
dc.citation Kroh, T., Jin, C., Krogen, P., Keathley, P. D., Calendron, A.-L., Siqueira, J. P., … Hong, K.-H. (2018). Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic. Optics Express, 26(13), 16955–16969. https://doi.org/10.1364/OE.26.016955
dc.description.version Article: Version of Record (VoR)


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© 2018 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved. Except where otherwise noted, the use of this item is bound by the following: © 2018 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.

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