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.

中文翻译：

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相干种群捕获中的拉比共振：微波混合方案

相干粒子捕获（CPT）共振信号在涉及精密感测的广泛应用中具有希望。通常，CPT现象发生在具有双色相位相干光场的三能级Λ系统中。我们在理论上和实验上研究了同时包含双色CPT光学场和外部微波（MW）场的基于Rb蒸汽电池的原子系统。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通过光场和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。MW场的Rabi频率可以通过SI（国际单位制）进行测量-基于Rabi共振线形，因此具有在该系统中实现光场强度稳定的潜力。还提供了简单的理论模型和数值计算来解释实验结果。在SI可追溯的光场强度标准的未来发展中有使用提议的技术的范围。