By the same authors

From the same journal

From the same journal

Micron-scale mapping of megagauss magnetic fields using optical polarimetry to probe hot electron transport in petawatt-class laser-solid interactions

Research output: Contribution to journalArticle


  • Gourab Chatterjee
  • Prashant Kumar Singh
  • A. P.L. Robinson
  • D. Blackman
  • N. Booth
  • O. Culfa
  • R. J. Dance
  • L. A. Gizzi
  • R. J. Gray
  • J. S. Green
  • P. Koester
  • G. Ravindra Kumar
  • L. Labate
  • Amit D. Lad
  • K. L. Lancaster
  • J. Pasley
  • N. C. Woolsey
  • P. P. Rajeev


Publication details

JournalScientific Reports
DateAccepted/In press - 17 Jul 2017
DateE-pub ahead of print - 21 Aug 2017
DatePublished (current) - 1 Dec 2017
Issue number1
Number of pages8
Early online date21/08/17
Original languageEnglish


The transport of hot, relativistic electrons produced by the interaction of an intense petawatt laser pulse with a solid has garnered interest due to its potential application in the development of innovative x-ray sources and ion-acceleration schemes. We report on spatially and temporally resolved measurements of megagauss magnetic fields at the rear of a 50-μm thick plastic target, irradiated by a multi-picosecond petawatt laser pulse at an incident intensity of ~1020 W/cm2. The pump-probe polarimetric measurements with micron-scale spatial resolution reveal the dynamics of the magnetic fields generated by the hot electron distribution at the target rear. An annular magnetic field profile was observed ~5 ps after the interaction, indicating a relatively smooth hot electron distribution at the rear-side of the plastic target. This is contrary to previous time-integrated measurements, which infer that such targets will produce highly structured hot electron transport. We measured large-scale filamentation of the hot electron distribution at the target rear only at later time-scales of ~10 ps, resulting in a commensurate large-scale filamentation of the magnetic field profile. Three-dimensional hybrid simulations corroborate our experimental observations and demonstrate a beam-like hot electron transport at initial time-scales that may be attributed to the local resistivity profile at the target rear.

Bibliographical note

© The Author(s) 2017

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