Chirped pulse Raman amplification in warm plasma: towards controlling saturation

X. Yang, G. Vieux, E. Brunetti, B. Ersfeld, J. P. Farmer, M. S. Hur, R. C. Issac, G. Raj, S. M. Wiggins, G. H. Welsh, S. R. Yoffe, D. A. Jaroszynski

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Abstract

Stimulated Raman backscattering in plasma is potentially an efficient method of amplifying laser pulses to reach exawatt powers because plasma is fully broken down and withstands extremely high electric fields. Plasma also has unique nonlinear optical properties that allow simultaneous compression of optical pulses to ultra-short durations. However, current measured efficiencies are limited to several percent. Here we investigate Raman amplification of short duration seed pulses with different chirp rates using a chirped pump pulse in a preformed plasma waveguide. We identify electron trapping and wavebreaking as the main saturation mechanisms, which lead to spectral broadening and gain saturation when the seed reaches several millijoules for durations of 10’s – 100’s fs for 250 ps, 800 nm chirped pump pulses. We show that this prevents access to the nonlinear regime and limits the efficiency, and interpret the experimental results using slowly-varying-amplitude, current-averaged particle-in-cell simulations. We also propose methods for achieving higher efficiencies.
Original languageEnglish
Article number13333
Number of pages9
JournalScientific Reports
Volume5
DOIs
Publication statusPublished - 20 Aug 2015

Keywords

  • Raman amplification
  • plasma channel
  • laser-plasma interactions

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Chirped pulse Raman amplification in warm plasma: towards controlling saturation

Vieux, G. (Creator), Yang, X. (Creator), Brunetti, E. (Creator), Ersfeld, B. (Contributor), Farmer, J. (Contributor), Hur, M. S. (Contributor), Issac, R. (Contributor), Raj, G. (Contributor), Wiggins, S. M. (Creator), Welsh, G. (Creator), Yoffe, S. (Contributor) & Jaroszynski, D. (Data Manager), University of Strathclyde, 16 Jul 2015

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    • 1 Invited talk

    A laser amplifier based on Raman amplification in plasma

    Gregory Vieux (Speaker)

    6 May 201811 Jun 2018

    Activity: Talk or presentation typesInvited talk

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