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.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics