Isolated attosecond pulses of μJ energy via coherent Thomson-backscattering, driven by a chirped laser pulse★
ELI-ALPS, ELI-HU Non-Profit Ltd., H-6720 Szeged, Dugonics tér 13, Hungary
2 Department of Theoretical Physics, University of Szeged, H-6720 Szeged, Tisza L. krt. 84-86, Hungary
3 Wigner Research Center for Physics, SZFI, H-1525 Budapest, PO Box 49, Hungary
a e-mail: Szabolcs.Hack@eli-alps.hu
Received in final form: 28 January 2019
Published online: 10 April 2019
New theoretical and numerical results are presented regarding isolated attosecond XUV – soft X-ray pulses, that can be generated by Thomson-backscattering of a high-intensity single-cycle near-infrared laser pulse on a suitable nanobunch of MeV electons. A simple approximate formula is derived for the cut-off frequency of the collective radiation spectrum, which is then employed to find the length of the nanobunch which emits an isolated pulse of 16 as length. Detailed analysis of the spectral, temporal and spatial features of this attosecond pulse is given. It is also shown that the 100 nJ pulse energy, corresponding to 2.1 × 1018W/cm2 peak intensity of the laser pulse, can be increased to reach the μJ pulse energy both by increasing the intensity or by setting a suitable down-chirp of the laser pulse.
Key words: Topical issue
© The Author(s) 2019. This article is published with open access at Springerlink.com
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