Compton散射对磁化等离子体调制不稳定性的影响

基于多光子非线性Compton散射模型,研究了多光子非线性Compton散射对激光在磁化等离子体中调制不稳定性的影响.将入射光和多光子非线性Compton散射光作为形成调制不稳定性的新机制,对非线性色散方程和控制方程进行了修正,给出了由入射光和多光子非线性Compton散射光形成的耦合左旋椭圆偏振光调制不稳定性的时间增...     

康普顿散射对非磁化等离子体光子晶体禁带密度温度特性的影响

应用多光子非线性康普顿(Compton)散射模型和有限时域差分法,研究了多光子非线性Compton散射对非磁化等离子体光子晶体光子禁带密度和温度特性的影响,提出了将入射光、Compton散射光、等离子体的温度和密度作为调控光子禁带的新机制。研究结果表明,改变温度和等离子体密度分布可实现对等离子体光子晶体的光子禁带拓展,而Compton散射减小了这种拓展效应。Compton散射可使光子禁带向高频方向比散射前有较大的移动,能更好地实现等离子体光子晶体的高通滤波特性。     

Backward rescattered photoelectron holography in strong-field ionization

By numerically solving the time-dependent Schr¨odinger equation, we observe a remarkable strong-field interference pattern in the photoelectron momentum distribution of a hydrogen atom ionized by a few-cycles laser pulse. This interference pattern is joined together with the familiar near-forward strong-field photoelectron holographic interference. By applying the strong-field approximation theory, we investigate the formation of this interference pattern, which arises from the interference between the backward rescattered part and the direct part of the tunneling ionized electron wave packet. We demonstrate that this backward rescattered photoelectron holographic interference can also be observed in a more realistic parallel two-color laser field. These results pave a new way to look into the atomic and molecular structure with ultrafast timescale.     

Compton散射对光子晶体中光束自陷的影响

用相干函数法研究了Compton散射下圆形部分相干光束在全内反射光子晶体中的自陷行为。研究发现,散射使光谱中非相干成分和衍射效应降低,形成孤子的几率提高。传输中孤子振荡幅值、压缩程度、变化周期、半径均比散射前小,相干半径比散射前大,自聚焦起主导作用。