论文标题
通过激光激光放大软X射线
Soft X-ray Amplification by an intense laser
论文作者
论文摘要
在等离子体中X射线与强烈的光线激光之间的相互作用中考虑了一种新的X射线扩增机制。在正常情况下，这种类型的物理过程的X射线放大是令人难以置信的，因为它的相位（即\ textbf {non-non-resonant}扰动）不适合将能量从可见光激光器传递到X射线。正如本文提出的那样，可以将这种不受欢迎的阶段操纵到理想的阶段中。考虑了两种情况。第一种情况是存在强等离子体密度梯度。当一个强的Langmuir波（其相位速度与X射线基团速度匹配）提供沿X射线传播途径的密度梯度时，可以进行持久扩增。 第二种情况是存在预兴奋的兰穆尔波。作者认为两个激光器，其频率与Langmuir Wave不同，反向传播和令人兴奋的Langmuir波动。在提到的Langmuir波的存在下，证明X射线和激光器之一之间的浮子相互作用会以所需的相激发血浆密度扰动，从而在X射线（可见光灯光激光器）上放大（衰减）。估计达到上述有利阶段和放大强度的条件，当满足条件时。放大强度很高，在两种情况下，每厘米的增益均可达到每厘米1000。
A new x-ray amplification mechanism is considered in an interaction between a x-ray and an intense visible-light laser in a plasma. In normal circumstances, the x-ray amplification from this type of the physical processes is implausible because its phase, which is the \textbf{non-resonant} perturbation, is not suitable for transferring the energy from the visible light laser to the x-ray. As proposed in this paper, this undesirable phase can be manipulated into the desirable one. Two situations are considered. The first case is in the presence of the strong plasma density gradient. A lasting amplification is possible when a strong Langmuir wave, whose phase velocity matches with the x-ray group velocity, provides the density gradient along the way of the x-ray propagation. The second case is in the presence of a pre-excited Langmuir wave. The author considers two lasers, with their frequency differing by the Langmuir wave, counter-propagating and exciting a rather strong Langmuir wave. In the presence of the mentioned Langmuir wave, it is demonstrated that the ponderomotive interaction between the x-ray and one of the lasers excites the plasma density perturbation with a desired phase, resulting to amplify (decay) the x-ray (visible light laser). The condition for achieving the mentioned favorable phase and the amplification strength, when the condition is met, is estimated. The amplification strength is quite high, where the gain per length could reach 1000 per cm in both cases.
