Coherent Population Trapping with High Common-Mode Noise Rejection Using Differential Detection of Simultaneous Dark and Bright Resonances

Abstract

Coherent manipulation of atomic states is highly desired in numerous applications spanning from fundamental physics to metrology. In this study, we propose and demonstrate, theoretically and experimentally, the simultaneous observation in a vapor cell of dark and bright resonances that provide, through a differential detection stage, an output coherent population trapping atomic resonance that benefits from a doubled amplitude and high common-mode noise rejection. This advanced spectroscopic scheme might be of interest for the development of high-performance vapor cell atomic clocks, sensors, or high-resolution spectroscopy experiments.

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

“…Based on our previous configurations involving the differential detection of CPT resonance using copropagating bichromatic light [19], we developed and implemented a simpler differential detection scheme, in which a counterpropagating bichromatic pump and probe beams were used to interact with the atomic ensemble; EIT and EIA signals were observed simultaneously, and their differential CPT (diff-CPT) signals were extracted continuously in the time domain rather than in the pulse mode, as in our previous scheme. Using this method, we benefited from the counter-propagating configuration and differential detection by obtaining an improved CPT signal amplitude and suppressed common-mode noise.…”

Constructive, Destructive and Differential Detection of Coherent Population Trapping Resonance

“…In this study, we propose and demonstrate a method for probing coherent population trapping resonances in an atomic vapor based on the simultaneous detection of mirror-images of transmission (dark state-EIT) and absorption resonances (bright state-EIA) for the clock transition, and subsequent use of a differential detection stage at the cell output [9,10]. This technique leads to the detection of an atomic resonance with enhanced amplitude and suppressed common noise.…”