laser与物质强相互作用中的纳米结构和增强吸收：laser预脉冲的影响
Nanostructures and enhanced absorption in intense laser interaction with matter: effect of laser prepulses
摘要：
硬X射线发射（20 - 200千电子伏）从等离子体产生的强激光脉冲纳米粒子涂层的目标相比，从光学抛光的目标。研究了不同预脉冲条件下纳米粒子对产额的增强作用。据观察，当纳米颗粒涂覆的靶用强度大于10^13 W/cm ^2的预脉冲照射时，增强降低。当预脉冲强度超过10^14 W/cm ^2时，增强完全消失。这归因于在主脉冲到达之前在纳米颗粒上形成预等离子体，随后进行结构修饰。有人建议，高对比度的超短脉冲是必不可少的纳米粒子作为产量增强剂。
英文摘要：
Hard x-ray emission (20 - 200 keV) from plasmas produced by intense laser pulses on nanoparticle coated targets is compared with that from optically polished targets. The yield enhancement offered by nanoparticles is studied under different prepulse conditions. It is observed that the enhancement reduces when the nanoparticle coated target is irradiated with a prepulse with intensity greater than 10^13 W/cm^2. When the prepulse intensity exceeds 10^14 W/cm^2, the enhancement vanishes completely. This is attributed to preplasma formation on nanoparticles their subsequent structural modifcation before the arrival of the main pulse. It is suggested that high-contrast ultrashort pulses are essential for nanoparticles to function as yield enhancers.
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