Identification of strong one-step two-photon absorption in a cascade three-level system

28th International Conference on Photonic, Electronic and Atomic Collisions

Liu, Ji-Cai^1 ; Chen, Lei^1 ; Zhang, Ye-Qi^1

Department of Mathematics and Physics, North China Electric Power University, Beijing

102206, China^1

关键词: Cascade three level system;    First derivative;    Intermediate state;    Time domain;    Two photon absorption;    Ultra-fast;    Zero point;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/488/3/032052/pdf
DOI  :  10.1088/1742-6596/488/3/032052

来源: IOP

【 摘 要 】

The ultrafast one-step and two-step two-photon absorption processes in a cascade three-level system induced by a strong femtosecond laser pulse is studied. The strong change of the population in the two-photon absorption state at the zero points of the first derivative of the population in the real intermediate state shows straightforwardly in time domain the footprint of the coherent one-step two-photon absorption.