Radially polarized, half-cycle, attosecond pulses from laser wakefields through coherent synchrotronlike radiation
Li, F. Y. and Sheng, Z. M. and Chen, M. and Yu, L. L. and Meyer-ter-Vehn, J. and Mori, W. B. and Zhang, J. (2014) Radially polarized, half-cycle, attosecond pulses from laser wakefields through coherent synchrotronlike radiation. Physical Review E, 90 (4). 043104. ISSN 2470-0053 (https://doi.org/10.1103/PhysRevE.90.043104)
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Abstract
Attosecond bursts of coherent synchrotronlike radiation are found when driving ultrathin relativistic electron disks in a quasi-one-dimensional regime of wakefield acceleration, in which the laser waist is larger than the wake wavelength. The disks of overcritical density shrink radially due to focusing wakefields, thus providing the transverse currents for the emission of an intense, radially polarized, half-cycle pulse of about 100 attoseconds in duration. The electromagnetic pulse first focuses to a peak intensity (7×10^20W/cm^2) 10 times larger than the driving pulse and then emerges as a conical beam. Basic dynamics of the radiative process are derived analytically and in agreement with particle-in-cell simulations. By making use of gas targets instead of solids to form the ultrathin disks, this method allows for high repetition rates required for applications.
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Item type: Article ID code: 53171 Dates: DateEvent23 October 2014Published7 October 2014AcceptedSubjects: Science > Physics Department: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 01 Jun 2015 15:09 Last modified: 21 Feb 2024 14:46 URI: https://strathprints.strath.ac.uk/id/eprint/53171