光控共振荧光X射线频率梳
X-ray frequency combs from optically controlled resonance fluorescence
摘要：
提出了一种X射线脉冲整形方案，将光学频率梳印在受驱动的X射线跃迁辐射上，从而产生X射线频率梳.用一个四能级系统描述了窄带X射线、光学辅助激光和光学频率梳驱动N离子的能级结构.通过包括发射的共振荧光的多粒子增强，预测光谱由以X射线跃迁能量为中心并且由与驱动光学频率梳相同的齿间距分开的等间隔窄线组成。给定一个已知的X射线参考频率，我们的梳可以用来确定一个未知的X射线频率。虽然依赖于用于驱动离子系综的光场的质量，但该模型在从100 eV到keV范围的能量下具有有效性。
英文摘要：
An x-ray pulse-shaping scheme is put forward for imprinting an optical frequency comb onto the radiation emitted on a driven x-ray transition, thus producing an x-ray frequency comb. A four-level system is used to describe the level structure of N ions driven by narrow-bandwidth x rays, an optical auxiliary laser, and an optical frequency comb. By including many-particle enhancement of the emitted resonance fluorescence, a spectrum is predicted consisting of equally spaced narrow lines which are centered on an x-ray transition energy and separated by the same tooth spacing as the driving optical frequency comb. Given a known x-ray reference frequency, our comb could be employed to determine an unknown x-ray frequency. While relying on the quality of the light fields used to drive the ensemble of ions, the model has validity at energies from the 100 eV to the keV range.
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