锶原子三重态双耦合场下的原子相干谱观测

Observation of Atomic Coherence in Strontium Triplet with Double Coupling Fields

以磁光阱中的锶冷原子为介质,对三重态双耦合场下的伞型结构电磁诱导透明(EIT)效应进行了实验观测。对实验中涉及到的抽运激光采用Pound-Drever-Hall稳频技术和注入锁定技术,对弱探测光进行功率稳定,提高了实验的观测精度。实验结果证明,耦合光的失谐量对三重态EIT有较大影响,且该EIT线形是两个Λ型结构EIT线形的简单叠加。

The umbrella-type triplet electromagnetically induced transparency （EIT） effect driven by two coupling fields with strontium cold atoms in the magneto-optical trap as medium is observed experimentally. The Pound- Drever-Hall frequency stabilization technique and the injection locking technique are applied to the pumping laser in the experiment, and the power stabilization technique for the weak probe laser is also used. The experimental observation precision is improved by these techniques. The experimental results prove that the detuning of coupling lights has relatively great influence on the triplet EIT. Moreover, the line shape of EIT is a simple superposition of two A-type EIT line shapes.