互组合线上探测场和泵浦场饱和产生的相干布居振荡
Coherent population oscillation produced by saturating probe and pump fields on the intercombination Line
摘要：
本文对174Yb互组合线上相干布居振荡和相干布居俘获的实验进行了理论研究。跃迁涉及自旋的变化，因此不能用有效的λ系统来解释。所报道的实验是在泵浦场和探测场都能使跃迁饱和的情况下进行的。我们通过数值计算和分析计算证明了当泵浦和探测开始饱和过渡时干涉最小值的出现。给出了干扰最小值出现时探测功率阈值的解析结果。我们还详细研究了施加磁场时干扰极小值的出现.磁场不仅产生塞曼分裂，而且由于与其他能级的耦合，还使系统开放。我们证明了在次谐波共振位置干涉极小的可能性。
英文摘要：
We present a theoretical study of the experiments on coherent population oscillations and coher- ent population trapping on the intercombination line of 174Y b. The transition involves a change of the spin and thus can not be interpreted in terms of an effective Lambda system. The reported experiments are done in the regime where both pump and probe fields can saturate the transition. We demonstrate by both numerical and analytical calculations the appearance of the interference minimum as both pump and probe start saturating the transition. We present an analytical result for the threshold probe power when the interference minimum can appear. We also present de- tailed study of the appearance of the interference minimum when magnetic fields are applied. The magnetic fields not only create Zeeman splittings but in addition make the system open because of the couplings to other levels. We show the possibility of interference minimum at the position of subharmonic resonances.
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