Based on the theory of velocity-selective coherent population trapping, we investigate an atom-laser system where a pair of counterpropagating laser fields interact with a three-level atom. The influence of the parame...Based on the theory of velocity-selective coherent population trapping, we investigate an atom-laser system where a pair of counterpropagating laser fields interact with a three-level atom. The influence of the parametric condition on the properties of the system such as velocity at which the atom is selected to be trapped, time needed for finishing the coherent trapping process, and possible electromagnetically induced transparency of an altrocold atomic medium, etc., is studied.展开更多
The construction of a two-dimensional magneto–optical trap with hollow cooling and pushing（2D-HP MOT） is reported in detail,and a velocity-tunable cold atomic beam produced by this 2D-HP MOT is demonstrated.The mag...The construction of a two-dimensional magneto–optical trap with hollow cooling and pushing（2D-HP MOT） is reported in detail,and a velocity-tunable cold atomic beam produced by this 2D-HP MOT is demonstrated.The magneto–optical trap system,which is constructed by a transparent quartz tube,is low in price,easy to fabricate and assemble,and convenient for atomic trapping and detection.The mean axial velocity of the cold atomic beam can be tuned from 4.5 to 8 m/s,while the atomic flux remains at a level of 1010 atoms∕s.This cold atomic beam source can be applied in the areas of high-precision measurements based on cold atoms.展开更多
基金The project supported by National Natural Science Foundation of China under Grant No. 10174007 and the State Key Basic Research Programs under Grant No. 2004CB719903
文摘Based on the theory of velocity-selective coherent population trapping, we investigate an atom-laser system where a pair of counterpropagating laser fields interact with a three-level atom. The influence of the parametric condition on the properties of the system such as velocity at which the atom is selected to be trapped, time needed for finishing the coherent trapping process, and possible electromagnetically induced transparency of an altrocold atomic medium, etc., is studied.
基金supported by the National Natural Science Foundation of China under Grant No.11304177
文摘The construction of a two-dimensional magneto–optical trap with hollow cooling and pushing（2D-HP MOT） is reported in detail,and a velocity-tunable cold atomic beam produced by this 2D-HP MOT is demonstrated.The magneto–optical trap system,which is constructed by a transparent quartz tube,is low in price,easy to fabricate and assemble,and convenient for atomic trapping and detection.The mean axial velocity of the cold atomic beam can be tuned from 4.5 to 8 m/s,while the atomic flux remains at a level of 1010 atoms∕s.This cold atomic beam source can be applied in the areas of high-precision measurements based on cold atoms.
