激光脉冲在欠稠密等离子体平板中传播期间功率损耗的抑制
Suppression of power losses during laser pulse propagation in underdense plasma slab
AI总结：
本研究通过二维PIC模拟揭示中低密度、非相对论条件下前向拉曼散射主导激光损耗，并提出以频率失谐大于等离子体频率的多色激光抑制该散射、实现高效功率传输。
摘要：
对于当前最先进的太瓦激光器，等离子体中的主要激光散射机制包括前向拉曼散射（FRS）、等离子体波激发以及自调制不稳定性（SMI）。利用二维PIC模拟，我们证明了在中低密度等离子体和非相对论激光场的区域中，FRS占据主导地位。然而，采用频率失谐超过等离子体频率（即 $Δω>ω_{\ m pe}$）的多色激光器可抑制FRS，从而使激光功率能够高效传输。
英文摘要：
For current state-of-the-art terawatt lasers, the primary laser scattering mechanisms in plasma include Forward Raman Scattering (FRS), excitation of plasma waves, and the self-modulational instability (SMI). Using 2D PIC simulations, we demonstrate the dominance of the FRS in the regime with medium-to-low density plasma and non-relativistic laser fields. However, the use of multi-colored lasers with frequency detuning exceeding the plasma frequency, $Δω>ω_{\rm pe}$, suppresses the FRS. The laser power can then be transmitted efficiently.
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