Time-resolved x-ray K-shell spectra from high density plasmas generated by ultrashort laser pulses.
Time-resolved x-ray K-shell spectra from high density plasmas generated by ultrashort laser pulses.
复制标题
超短激光脉冲产生的高密度等离子体的时间分辨 X 射线 K 壳层光谱。
DOI：
10.1103/physreve.63.026407
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
K. Witte
中科院分区：
文献类型：
--
作者：
U. Andiel;K. Eidmann;K. Witte
我们展示了 C、F、Na 和 Al 的时间分辨 X 射线光谱，这些光谱是通过将超短频率倍频 Ti:蓝宝石激光脉冲聚焦在固体平面目标上而生成的。使用高分辨率 X 射线条纹相机与激光触发累积系统相结合，在添加数千次激光射击的 X 射线信号时，我们实现了 1.7 ps 的时间分辨率。观察到持续时间在 2-4 ps 范围内的 K 壳共振线发射。通常观察到 Ly α 发射比 He α 发射更快，并且观察到 X 射线脉冲持续时间随着原子序数的增加而减少。应用流体动力学代码与原子动力学代码相结合来模拟时间分辨等离子体发射，与实验数据显示出良好的一致性。
We present time-resolved x-ray spectra of C, F, Na, and Al, generated by focusing ultrashort frequency doubled Ti:sapphire laser pulses on solid plane targets. Using a high resolution x-ray streak camera in combination with a laser triggered accumulation system, we achieved a time resolution of 1.7 ps when adding the x-ray signal of many thousands of laser shots. K-shell resonance line emission with a duration in the range of 2-4 ps is observed. Ly alpha emission is generally observed to be faster than He alpha emission and the x-ray pulse duration is observed to decrease with increasing atomic number. A hydrodynamic code in combination with an atomic kinetics code is applied for simulation of time-resolved plasma emission, showing good agreement with experimental data.