论文标题
混合刺激的拉曼散射 - 两个等离子体衰减的不稳定性和3/2谐波在陡峭的飞秒等离子体中
Hybrid Stimulated Raman Scattering -- Two Plasmon Decay Instability and 3/2 Harmonic in Steep-Gradient Femtosecond Plasmas
论文作者
论文摘要
杂化刺激的拉曼散射 - 两种等离子衰变不稳定性在相互作用时具有血浆波的激发和能量吸收起着主要作用等离子体在四分之一临界表面附近，即现代实验条件的典型情况。等离子会激发，因为两个波数据包在该表面附近，沿其正常情况非常宽的$ \ $ \ $ \ $ \。因此，3/2谐波生成的相位匹配条件立即实现，并包括来自血浆波高谐波的新机制。后一种机制已被证明是在实验上观察到额外的3/2谐波光束。
The hybrid Stimulated Raman Scattering - Two Plasmon Decay instability had shown to play the dominant role for plasma waves excitation and energy absorption at interaction of very intense femtosecond obliquely incident $p$-polarized laser pulse (intensity $10^{17}-5\cdot10^{19}$ W/cm$^2$) with a steep gradient ($L\sim λ$) plasma near the quarter critical surface, i.e. within the typical for modern experiments conditions. The plasmons are excited as two wave packets confined near this surface with very wide $\approx ω_0/c$ spatial spectra along its normal. Hence, phase matching conditions for 3/2 harmonic generation fulfill immediately and include new mechanism coming from high harmonics of plasma waves. The latter mechanism have been proved experimentally observing an additional 3/2 harmonic beam.
