Rabi resonance in coherent population trapping: microwave mixing scheme

Abstract

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.

Noise suppression by differential detection of simultaneous electromagnetically induced transparency and absorption in counterpropagating bichromatic light

“…an EIT on CH1 converts to an EIA signal, and vice versa. The signal amplitude oscillates periodically [28][29][30], with a period (z p ) half of the ground-state hyperfine transition wavelength (λ hf ), i.e. z p = λ hf /2, which is approximately 22 mm for 87 Rb atoms.…”

The Ground State Decoherence Effect on an1 Amplification of a Phase Sensitive Δ System

“…The Δ system experimentally reliable either with 85 or 87 atoms at room temperature using a microwave cavity [14][15][16][17]. Most of the studies on the Δ system have concentrated on the ground state coherence (GSC) that could either be controlled by the Rabi frequency of the microwave field (MW) Ω or by the resultant phase of the optical fields and the MW field [13,14,17,22]. Even in those experiments, the amplification of the probe signal is engineered by the two parameters Ω and .…”