窄带硬X射线激光
Narrow-band hard-x-ray lasing
摘要：
自从X射线自由电子激光器（XFEL）问世以来，人们一直致力于获得具有更好时间相干性的X射线脉冲。在这里，我们提出了一个计划，以产生完全相干的X射线激光（XRL）的基础上，在高电荷态离子（HCI）的粒子数反转，通过快速内壳层光电离使用XFEL脉冲在激光产生的等离子体。数值模拟表明，人们可以获得高强度，飞秒X射线脉冲的相对带宽$Δω/ω=10^{-5}$ - $10^{-7}$的数量级窄于在XFEL脉冲的波长下降到亚-ngström制度。这种XRL可能适用于X射线量子光学和计量学的研究，调查X射线和物质之间的非线性相互作用，或在实验室天体物理学的高精度光谱研究。
英文摘要：
Since the advent of x-ray free-electron lasers (XFELs), considerable efforts have been devoted to achieve x-ray pulses with better temporal coherence. Here, we put forward a scheme to generate fully coherent x-ray lasers (XRLs) based on population inversion in highly charged ions (HCIs), created by fast inner-shell photoionization using XFEL pulses in a laser-produced plasma. Numerical simulations show that one can obtain high-intensity, femtosecond x-ray pulses of relative bandwidths $Δω/ω=10^{-5}$ - $10^{-7}$ by orders of magnitude narrower than in XFEL pulses for wavelengths down to the sub-ångström regime. Such XRLs may be applicable in the study of x-ray quantum optics and metrology, investigating nonlinear interactions between x-rays and matter, or in high-precision spectroscopy studies in laboratory astrophysics.
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