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

  • R. K. KIRKWOOD (a1), Y. PING (a1), S. C. WILKS (a1), N. MEEZAN (a1), P. MICHEL (a1), E. WILLIAMS (a1), D. CLARK (a1), L. SUTER (a1), O. LANDEN (a1), N. J. FISCH (a2), E. J. VALEO (a2), V. MALKIN (a2), D. TURNBULL (a2), S. SUCKEWER (a2), J. WURTELE (a3), T. L. WANG (a4), S. F. MARTINS (a4), C. JOSHI (a4), L. YIN (a5), B. J. ALBRIGHT (a5), H. A. ROSE (a5) and K. J. BOWERS (a5)...

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.

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Journal of Plasma Physics
  • ISSN: 0022-3778
  • EISSN: 1469-7807
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