Ultrafast population transfer in a Λ-configuration level system driven by few-cycle laser pulses  

作　　者：张文静 谢小涛 金璐玲 白晋涛 

机构地区：[1]Department of Physics, Northwest University [2]National Photoelectric Technology and Functional Materials & Application of Science and Technology International Cooperation Base [3]National Key Laboratory of Photoelectric Technology and Functional Materials (Culture Base)

出　　处：《Chinese Physics B》2013年第11期337-344,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.61008016);the Natural Science Foundation in Shaanxi Province,China(Grant No.2010JQ1002);the Specialized Research Fund for the Doctoral Program of Higher Education of China(Grant No.20106101120020)

摘　　要：The feasibility of population transfer from a populated level via an intermediate state to the target level driven by few-cycle pulses is theoretically discussed. The processes of on- or far-resonance stimulated Raman scattering with sequential or simultaneous ultrashort pulses are investigated respectively. We find that the ultrashort pulses with about two optical cycles can be used to realize the population operation. This suggests that the population transfer can be completed in the femtosecond time scale. At the same time, our simulation shows that the signal of the carrier-envelope-phase-dependent effect can be enlarged due to quantum interference in some conditions. Our theoretic study may promote the research on the coherent control via ultrashort pulses in the related fields.The feasibility of population transfer from a populated level via an intermediate state to the target level driven by few-cycle pulses is theoretically discussed. The processes of on- or far-resonance stimulated Raman scattering with sequential or simultaneous ultrashort pulses are investigated respectively. We find that the ultrashort pulses with about two optical cycles can be used to realize the population operation. This suggests that the population transfer can be completed in the femtosecond time scale. At the same time, our simulation shows that the signal of the carrier-envelope-phase-dependent effect can be enlarged due to quantum interference in some conditions. Our theoretic study may promote the research on the coherent control via ultrashort pulses in the related fields.

关 键 词：ultrafast processes coherent control of atomic interactions with photons quantum state engineer-ing and measurements 

分 类 号：O431.2[机械工程—光学工程]