Author Affiliations
Abstract
1 Institute of Quantum Precision Measurement, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
2 Department of Physics, Xiamen University, Xiamen 361005, China
3 Graduate School of China Academy of Engineering Physics, Beijing 100193, China
We propose a scheme that utilizes weak-field-induced quantum beats to investigate the electronic coherences of atoms driven by a strong attosecond extreme ultraviolet (XUV) pulse. The technique involves using a strong XUV pump pulse to excite and ionize atoms and a time-delayed weak short pulse to probe the photoelectron signal. Our theoretical analysis demonstrates that the information regarding the bound states, initiated by the strong pump pulse, can be precisely reconstructed from the weak-field-induced quantum beat spectrum. To examine this scheme, we apply it to the attosecond XUV laser-induced ionization of hydrogen atoms by solving a three-dimensional time-dependent Schrödinger equation. This work provides an essential reference for reconstructing the ultrafast dynamics of bound states induced by strong XUV attosecond pulses.
attosecond pulse bound-state dynamics quantum beats Chinese Optics Letters
2024, 22(2): 020201
河北大学物理科学与技术学院, 河北 保定 071002
通过求解准Λ-型四能级系统的含时密度矩阵方程，研究了系统从单窗口电磁诱导透明(EIT)向双窗口EIT转换的相干瞬态过程。 该过程表现为一种量子拍频形式，并利用缀饰态理论很好地 解释了量子拍频的规律，指出这种量子拍频效应源于射频驱动场所引起劈裂能级间的量子相干。结果表明:当探测场与相应的裸态跃迁能级共振作用时，拍频频率等于 射频驱动场Rabi频率的二分之一;当探测场与强射频驱动场和原子系统相互作用所产生的缀饰态跃迁能级共振时，拍频频率等于射频驱动场的Rabi频率。
量子光学 电磁诱导透明 相干瞬态 量子拍频 缀饰态 quantum optics electromagnetically induced transparency coherent transient quantum beats dressed state
