摘要：在惯性约束聚变及实验室天体物理研究中,均需要对等离子体的形态进行清晰的成像,同时具有单色、高分辨、大视场的X射线球面弯晶背光成像是其中一项关键的诊断技术。本文首先对球面弯晶背光成像技术的成像性能进行分析,获得了空间分辨率、成像效率等性能参数随成像系统设计参数变化的关系。在此基础上,利用神光II高功率激光辐照Si靶,激发产生1.865 keV的Heα线,对球面弯晶背光成像系统的性能进行实验验证。实验得到清晰的网格图像和生物样品图像,实验结果与理论计算值相符,成像分辨率达到4.8μm。该工作满足X射线弯晶成像高分辨率的要求,可用于惯性约束聚变等相关实验中激光等离子体的精密诊断。

摘要：文章报导了基于大基模体积的高能量飞秒钛宝石激光再生放大器的设计与实验研究,在重复频率10 Hz、抽运能量60 mJ的激励下,得到了单脉冲能量17.4 mJ的种子脉冲放大结果,压缩后的脉冲宽度为40.6 fs,能量为13.9 mJ.借助于此大基模体积再生腔,仅增加一级多通放大,实现了峰值功率达1.9 TW飞秒激光脉冲输出.结果表明,大模体积再生放大不仅降低了后续放大对抽运能量的要求,也可以单独压缩实现再生腔直接输出10 mJ量级的飞秒激光脉冲,是大能量高峰值功率飞秒激光系统的优质前端.

摘要：We theoretically investigate a I3.9 nm Ni-like Ag x-ray laser using a one-dimensional hydrodynamic code coupled with an atomic physics data package. The population inversion is transiently pumped by a grazing incident 0.5ps main pulse irradiating into an optimized plasma, which is generated by a normal incidence 300ps pulse and a subsequent grazing incidence 300 ps pulse. The effect of the grazing-incidence angle on the source position of the output x-ray laser is investigated. Near zero deflecting angle is found for the peak output intensity of the Ni-like Ag x-ray lasers, with a small FWHM divergence of 5 mrad. It is predicted that saturation can be achieved with a total pump energy of 165m^3.