热蒸汽中的动态密度光栅

G. Lippi, S. Barbay, G. Barozzi, A. Roux, J. Tredicce
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引用次数: 0

摘要

我们在xsrubidiin di线的F=3至F=3强度的2个扫描波中创建了2个暗光学晶格结构。F=3基岩与F=2和F=3激发态的耦合产生周期势,其中原子被困在纯圆偏振的位置,在那里它们仅与光场弱耦合。我们从光学晶格中绝热释放原子,并以21个单光子反冲的三分之一的分辨率测量它们的动量分布。在绝热释放过程中,准动量和能带居数是守恒的。最低能带的居群映射在自由原子的-hk到+hk动量区间上,第一能带映射在-2hk到-hk和hk到2hk两个动量区间上。该图显示了测量种群与数值模拟确定的种群的比较,数值模拟使用速率方程方法获得布洛赫态的稳态种群。
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Dynamical Density Grating in a Hot Vapor
We create ii dark optical lattice structure in ii scanding wave tuned to the blue of the F=3 to F=3 Irtinsition ofthe XSRubidiuin DI-line. The coupling of the F=3 ground slate lo both the F=2 and F=3 excited states induces a periodic potential i n which the atoms are trapped at locations of purely circular polarisation, wherc they itre only weakly coupled to the light field. We adiabatically release the atoms rrom the optical lattice and measure their inomentuin distribution with a resolution of one third of 21 single photon recoil. During the adiabatic release the quasi-momentum and the population of the energy bands are conserved. The population of the lowest energy band is mapped on the -hk to +hk momentum interval of the free atom, and the first energy band is mapped on the two momentum intervals -2hk to -hk and hk to 2hk. The figure shows the measured populations i n comparision with those determined by a numerical simulation, which uses a rate equation approach to obtain the steady state populations of the Bloch states.
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