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Chin. Phys. B, 2008, Vol. 17(7): 2522-2526    DOI: 10.1088/1674-1056/17/7/030

Population transfer by femtosecond laser pulses in a ladder-type atomic system

Fan Xi-Jun(樊锡君)a), Li Ai-Yun(李爱云)a), Tong Dian-Min(仝殿民)b), and Liu Cheng-Pu(刘呈普)c)
a College of Physics and Electronics, Shandong Normal University, Jinan 250014, China; b School of Physics and Microelectronics, Shandong University, Jinan 250100, China; c Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
Abstract  The population transfer in a ladder-type atomic system driven by linearly polarized sech-shape femtosecond laser pulses is investigated by numerically solving Schrödinger equation without including the rotating wave approximation (RWA). It is shown that population transfer is mainly determined by the Rabi frequency (strength) of the driving laser field and the chirp rate, and that the ratio of the dipole moments and the pulse width also have a prominent effect on the population transfer. By choosing appropriate values of the above parameters, complete population transfer can be realized.
Keywords:  population transfer      femtosecond laser pulses      ladder-type system  
Received:  06 November 2007      Revised:  26 December 2007      Accepted manuscript online: 
PACS:  32.80.Xx (Level crossing and optical pumping)  
  31.15.-p (Calculations and mathematical techniques in atomic and molecular physics)  
  32.10.Dk (Electric and magnetic moments, polarizabilities)  
  42.60.Fc (Modulation, tuning, and mode locking)  
Fund: Project supported by National Basic Research Program of China (Grant No 2006CB806003), the Natural Science Foundation of Shandong Province, China (Grant No Y2006A21),the National Natural Science Foundation of China (Grant No 10675076) and State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China.

Cite this article: 

Fan Xi-Jun(樊锡君), Li Ai-Yun(李爱云), Tong Dian-Min(仝殿民), and Liu Cheng-Pu(刘呈普) Population transfer by femtosecond laser pulses in a ladder-type atomic system 2008 Chin. Phys. B 17 2522

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