驻波场中梯形三能级原子的受力分析  

Analyze on the Force of a Ladder-Type Three-Level Atom Driven by a Standing Wave

作　　者：王月明[1] 顾怀强[2] 金康[3] 

机构地区：[1]山西大学理论物理研究所,山西太原030006 [2]兰州大学核科学与技术学院,甘肃兰州730000 [3]兰州大学理论物理研究所,甘肃兰州730000

出　　处：《山西大学学报（自然科学版）》2007年第4期476-478,共3页Journal of Shanxi University(Natural Science Edition)

基　　金：山西大学青年科技基金(No.2006023)

摘　　要：从三能级原子的主方程出发,给出了能级近似等间距梯型三能级原子在单色驻波场中所受偶极力的稳态解,并进行了数值计算作图分析了偶极力,能级布居率随失谐量,光场幅度和空间的变化.结果表明:原子所受的偶极力与光场幅度梯度成比例,原子的内态相干对偶极力起着调制作用,这在光场与原子的双光子共振点附近体现尤为明显;且随着光场幅度增大原子能级布居愈趋于饱和,偶极力趋于零.The dipole force＇s steady solution of a ladder-type three-level atom of nearly equispaced energy level driven by a standing wave is derived from the atomic master equation. The variance of dipole force and the population of the energy level with the detunings,the space and the amplitude are shown by numerical calculation. The results show that the dipole force is proportional to the gradient of amplitude of the standing wave and the coherences between the atomic internal states plays a modulating role on the force, which is the most remarkable near the two-photon resonance point. Besides the levels tend to reach a equalpopulation and the dipole force tend to be zero as the amplitude Of the electric field becomes bigger.

关 键 词：量子光学 偶极力 主方程 双光子共振 

分 类 号：O431[机械工程—光学工程]