Observation of amplification of light by Langmuir waves and its saturation on the electron kinetic timescale

R. K. Kirkwood, Y. Ping, S. C. Wilks, N. Meezan, P. Michel, E. Williams, D. Clark, L. Suter, O. Landen, N. J. Fisch, E. J. Valeo, V. Malkin, D. Turnbull, S. Suckewer, J. Wurtele, T. L. Wang, S. F. Martins, C. Joshi, L. Yin, B. J. AlbrightH. A. Rose, K. J. Bowers

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Abstract

Experiments demonstrate the ∼77× - amplification of 0.5 to 3.5-ps pulses of seed light by interaction with Langmuir waves in a low density (1.2 × - 1019 cm-3) plasma produced by a 1-ns, 230-J, 1054-nm pump beam with 1.2 × - 1014 W/cm2 intensity. The waves are strongly damped (kλD = 0.38, Te = 244 eV) and grow over a ∼ 1 mm length, similar to what is experienced by scattered light when it interacts with crossing beams as it exits an ignition target. The amplification reduces when the seed intensity increases above ∼1 × - 1011 W/cm2, indicating that saturation of the plasma waves on the electron kinetic time scale (<0.5 ps) limits the scatter to ∼1% of the available pump energy. The observations are in agreement with 2D PIC simulations in this case.

Original languageEnglish (US)
Pages (from-to)521-528
Number of pages8
JournalJournal of Plasma Physics
Volume77
Issue number4
DOIs
StatePublished - Aug 1 2011

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Kirkwood, R. K., Ping, Y., Wilks, S. C., Meezan, N., Michel, P., Williams, E., Clark, D., Suter, L., Landen, O., Fisch, N. J., Valeo, E. J., Malkin, V., Turnbull, D., Suckewer, S., Wurtele, J., Wang, T. L., Martins, S. F., Joshi, C., Yin, L., ... Bowers, K. J. (2011). Observation of amplification of light by Langmuir waves and its saturation on the electron kinetic timescale. Journal of Plasma Physics, 77(4), 521-528. https://doi.org/10.1017/S0022377810000681