TY - JOUR
T1 - Electron-Nanobunch-Width-Dominated Spectral Power Law for Relativistic Harmonic Generation from Ultrathin Foils
AU - Edwards, Matthew R.
AU - Fasano, Nicholas M.
AU - Mikhailova, Julia M.
N1 - Funding Information:
This work was partially supported by the National Science Foundation under Grants No. PHY 1506372 and No. PHY 1806911 and the Department of Energy under Grant No. DE-SC0017907. M. R. E. was partially supported by a Lawrence Fellowship with Project No. 20-ERD-057 from Lawrence Livermore National Laboratory. Simulations were performed at the High Performance Computing Center at Princeton University. The epoch code was developed as part of the UK EPSRC 300 360 funded Project No. EP/G054940/1. We would like to thank Paul Gibbon for help with the bops code. Lawrence Livermore National Laboratory is operated by Lawrence Livermore National Security, LLC, for the U.S. Department of Energy, National Nuclear Security Administration under Contract No. DE-AC52-07NA27344.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/5/8
Y1 - 2020/5/8
N2 - Relativistic high-order harmonic generation from solid-density plasma offers a compact source of coherent ultraviolet and x-ray light. For solid targets much thinner than the laser wavelength, the plasma thickness can be tuned to increase conversion efficiency; a reduction in total charge allows for balancing the laser and plasma driving forces, producing the most effective interaction. Unlike for semi-infinite plasma surfaces, we find that for ultrathin foil targets the dominant factor in the emission spectral shape is the finite width of the electron nanobunches, leading to a power-law exponent of approximately 10/3. Ultrathin foils produce higher-efficiency frequency conversion than solid targets for moderately relativistic (1
AB - Relativistic high-order harmonic generation from solid-density plasma offers a compact source of coherent ultraviolet and x-ray light. For solid targets much thinner than the laser wavelength, the plasma thickness can be tuned to increase conversion efficiency; a reduction in total charge allows for balancing the laser and plasma driving forces, producing the most effective interaction. Unlike for semi-infinite plasma surfaces, we find that for ultrathin foil targets the dominant factor in the emission spectral shape is the finite width of the electron nanobunches, leading to a power-law exponent of approximately 10/3. Ultrathin foils produce higher-efficiency frequency conversion than solid targets for moderately relativistic (1
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U2 - 10.1103/PhysRevLett.124.185004
DO - 10.1103/PhysRevLett.124.185004
M3 - Article
C2 - 32441983
AN - SCOPUS:85084749844
SN - 0031-9007
VL - 124
JO - Physical review letters
JF - Physical review letters
IS - 18
M1 - 185004
ER -