高angular-momentum系统的有效极化
Efficient polarization of high-angular-momentum systems
摘要：
我们提出了适用于原子和分子中开放的高角动量跃迁的光泵浦方法，对于这些光泵浦，传统的光泵浦将导致显着的布居数损失。我们提出使用相干布居转移技术（例如，绝热快速通过）来排列原子，以便随着从较高状态的每次自发衰变而增加从系统移除的熵。这使得产生拉伸态所需的自发发射事件的数量最小化，从而减少了由于衰变到其他状态而导致的布居损失。为了在具有角动量J的流形中产生拉伸态，传统的光泵浦需要每个原子约2J的自发衰变，我们提出的一种方法将其减少到约log_2（2J），而另一种方法将其减少到约一个自发衰变，与J无关。
英文摘要：
We propose methods of optical pumping that are applicable to open, high-angular-momentum transitions in atoms and molecules, for which conventional optical pumping would lead to significant population loss. Instead of applying circularly polarized cw light, as in conventional optical pumping, we propose to use techniques for coherent population transfer (e.g., adiabatic fast passage) to arrange the atoms so as to increase the entropy removed from the system with each spontaneous decay from the upper state. This minimizes the number of spontaneous-emission events required to produce a stretched state, thus reducing the population loss due to decay to other states. To produce a stretched state in a manifold with angular momentum J, conventional optical pumping requires about 2J spontaneous decays per atom, one of our proposed methods reduces this to about log_2(2J), while another of the methods reduces it to about one spontaneous decay, independent of J.
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