All-optical Stückelberg spectroscopy of strongly driven Rydberg states
All-optical Stückelberg spectroscopy of strongly driven Rydberg states
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强驱动里德堡态的全光学施克尔伯格光谱
DOI：
10.1103/physrevresearch.4.023135
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发表时间：
2022
影响因子：
4.2
通讯作者：
N. Zhavoronkov
中科院分区：
文献类型：
--
作者：
Ulrich Bengs;S. Patchkovskii;M. Ivanov;N. Zhavoronkov
在强光场与原子、分子的相互作用中，电子能级的交流斯塔克位移是普遍存在的。当飞秒激光脉冲的上升沿和下降沿的光强发生变化时，它会使里德堡态与基态发生多光子共振。在脉冲的前沿和后沿产生的瞬态激励的两个共振路径产生杨氏型干涉，通常称为Stückelberg振荡。在这里，我们报告的观察Stückelberg振荡的强度的相干自由感应衰减共振多光子激发。此外，结合实验结果、精确的数值模拟和一个简单的模型，我们利用Stückelberg振荡在脉冲结束后通过全光测量恢复了强驱动Rydberg态在激光脉冲内的布居动力学.我们证明了这种光谱的潜力，以表征里德伯态的寿命打扮的激光场的强度远远超过库仑场之间的里德伯电子和核心。
The AC Stark shift of electronic levels is ubiquitous in the interaction of intense light fields with atoms and molecules. As the light intensity changes on the rising and falling edges of a femtosecond laser pulse, it shifts the Rydberg states in and out of multiphoton resonances with the ground state. The two resonant pathways for transient excitation arising at the leading and the trailing edges of the pulse generate Young's type interference, generally referred to as the Stückelberg oscillations. Here we report the observation of the Stückelberg oscillations in the intensity of the coherent free-induction decay following resonant multiphoton excitation. Moreover, combining the experimental results with accurate numerical simulations and a simple model, we use the Stückelberg oscillations to recover the population dynamics of strongly driven Rydberg states inside the laser pulse by all-optical measurements after the end of the pulse. We demonstrate the potential of this spectroscopy to characterize lifetimes of Rydberg states dressed by laser fields with strengths far exceeding the Coulomb field between the Rydberg electron and the core.