Liu Xiaochi, Lv Ya-Nan, Kang Songbai, Zou Chang-Lin, Duan Junyi, Ru Ning, Qu Jifeng
Opt Express. 2021 Jan 18;29(2):2466-2477. doi: 10.1364/OE.412139.
Coherent population trapping (CPT) resonance signals have promise in a wide range of applications involving precision sensing. Generally, the CPT phenomenon occurs in a three-level Λ system with a bichromatic phase-coherent light fields. We theoretically and experimentally studied an Rb vapor-cell-based atomic system involving bichromatic CPT optical fields and an external microwave (MW) field simultaneously. In such a mixing scheme, the coherence of the ground states could be controlled either by the Rabi frequency of the microwave field or by the relative phase between the optical fields and the MW field. Moreover, we investigated the Rabi resonance in this mixing scheme. The Rabi frequency of the MW field can be measured SI (International System of Units)-traceably based on the Rabi resonance lineshape, and thus holds the potential to realize intensity stabilization of the optical field in this system. Simple theoretical models and numerical calculations are also presented to explain the experimental results. There is scope to use the proposed technique in future development of SI-traceable optical field strength standards.
相干布居囚禁（CPT）共振信号在涉及精密传感的广泛应用中具有前景。一般来说，CPT现象发生在具有双色相位相干光场的三能级Λ系统中。我们对一个基于铷气室的原子系统进行了理论和实验研究，该系统同时涉及双色CPT光场和外部微波（MW）场。在这种混合方案中，基态的相干性可以通过微波场的拉比频率或光场与MW场之间的相对相位来控制。此外，我们研究了这种混合方案中的拉比共振。基于拉比共振线形，可以以国际单位制（SI）可溯源的方式测量MW场的拉比频率，因此在该系统中具有实现光场强度稳定的潜力。还给出了简单的理论模型和数值计算来解释实验结果。在未来可溯源至SI的光场强度标准的发展中，有使用所提出技术的空间。
