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Chinese Physics, 2004, Vol. 13(7): 1005-1012    DOI: 10.1088/1009-1963/13/7/007
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Radiation pressure and laser cooling of a three-level atom in a ladder configuration

Tan Lei (谭磊), Wang Zhi-Cheng (汪志诚), Gu Huai-Qiang (顾怀强)
Department of Physics, Lanzhou University, Lanzhou 730000, China
Abstract  Radiation pressure and laser cooling of a moving three-level ladder-type atom in bichromatic travelling fields are considered. The dependence of the force on parameters such as detunings, Rabi frequencies and spontaneous decay rates is calculated numerically and shown graphically, and analytical expressions for the force are obtained for some special parameter values. It is shown that the radiation pressure shows Doppler-shifted resonance peaks resulting respectively from one-photon and two-photon transitions. Using the present scheme, Doppler cooling of sodium exploiting the 3$^2$S$_{1/2}$-3$^2$P$_{3/2}$-3$^2$D$_{5/2}$ cascade transitions is investigated. It is found that temperatures lower than the Doppler limit can be achieved.
Keywords:  three-level atom      ladder configuration      radiation pressure      Doppler cooling  
Received:  20 October 2003      Revised:  09 January 2004      Accepted manuscript online: 
PACS:  37.10.De (Atom cooling methods)  
  32.80.Lg  
  42.50.Vk  
  32.70.Jz (Line shapes, widths, and shifts)  
  32.80.Wr (Other multiphoton processes)  
Fund: Project supported by the Doctoral Programme Foundation of the State Education Ministry of China (Grant No 1999073001).

Cite this article: 

Tan Lei (谭磊), Wang Zhi-Cheng (汪志诚), Gu Huai-Qiang (顾怀强) Radiation pressure and laser cooling of a three-level atom in a ladder configuration 2004 Chinese Physics 13 1005

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