Propagation-assisted generation of intense few-femtosecond high-harmonic pulses
| Autor: | Ingo Will, O. Ghafur, Katalin Kovács, Bernd Schütte, J. Tümmler, Björn Senfftleben, Tamas Nagy, Daniela Rupp, Katalin Varjú, Marc J. J. Vrakking, Balázs Major, Martin Kretschmar, Valer Tosa, A. Hoffmann |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Atomic Physics (physics.atom-ph)
FOS: Physical sciences Physics - Atomic Physics law.invention Optics pulse reshaping law Ionization High harmonic generation high-harmonic generation Electrical and Electronic Engineering Absorption (electromagnetic radiation) extreme-ultraviolet pulses non-linear optics fluorescence Physics 500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik business.industry Nonlinear optics Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Blueshift Extreme ultraviolet Femtosecond business pulse reshaping fluorescence Optics (physics.optics) Physics - Optics |
| Zdroj: | JPhys Photonics, 2 (3) |
| ISSN: | 2515-7647 |
| DOI: | 10.3929/ethz-b-000447175 |
| Popis: | The ongoing development of intense high-harmonic generation (HHG) sources has recently enabled highly non-linear ionization of atoms by the absorption of at least 10 extreme-ultraviolet (XUV) photons within a single atom (Senfftleben et al, arXiv:1911.01375). Here we investigate how the generation of these very intense HHG pulses in our 18-m-long beamline is aided by the reshaping of the fundamental, few-cycle, near-infrared (NIR) driving laser within a 30-cm-long HHG Xe medium. Using an incident NIR intensity that is higher than what is required for phase-matched HHG, signatures of reshaping are found by measuring the NIR blueshift and the fluorescence from the HHG medium along the propagation axis. These results are well reproduced by numerical calculations that show temporal compression of the NIR pulses in the HHG medium. The simulations predict that after refocusing an XUV beam waist radius of 320 nm and a clean attosecond pulse train can be obtained in the focal plane, with an estimated XUV peak intensity of 9 × 1015 W cm−2. Our results show that XUV intensities that were previously only available at large-scale facilities can now be obtained using moderately powerful table-top light sources. JPhys Photonics, 2 (3) ISSN:2515-7647 |
| Databáze: | OpenAIRE |
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