一维瞬态速度选择相干布居俘获的实验观察
Experimental observation of transient velocity-selective coherent population trapping in one dimension
摘要：
本文报道了亚稳态氖原子束中的瞬态速度选择相干布居俘获现象。利用横向光束剖面测量了原子与对向传播的σ +和σ-辐射相互作用产生的J_g=2 <->J_e=1跃迁的动量分布。这种转变表现出稳定的VSCPT暗态形成的两个|J=2，m=+/-1>态，以及包含|J=2，m=+/-2>且|J=2，m=0>状态。通过实验和数值模拟研究了稳定和亚稳态暗态的形成和衰减动力学，并实验观察到亚稳态暗态的有限寿命。我们比较测量的分布与主方程的数值解。
英文摘要：
We report the observation of transient velocity-selective coherent population trapping (VSCPT) in a beam of metastable neon atoms. The atomic momentum distribution resulting from the interaction with counterpropagating sigma_+ and sigma_- radiation which couples a J_g=2 <-> J_e=1 transition is measured via the transversal beam profile. This transition exhibits a stable VSCPT dark state formed by the two |J=2,m=+/-1> states, and a metastable dark state containing the |J=2,m=+/-2> and |J=2,m=0> states. The dynamics of the formation and decay of stable and metastable dark states is studied experimentally and numerically and the finite lifetime of the metastable dark state is experimentally observed. We compare the measured distribution with a numerical solution of the master equation.
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