Rydberg-atom based radio-frequency electrometry using frequency modulation spectroscopy in room temperature vapor cells

Santosh Kumar, Haoquan Fan, Harald Kübler, Akbar J. Jahangiri, James P. Shaffer
2017 Optics Express  
Rydberg atom-based electrometry enables traceable electric field measurements with high sensitivity over a large frequency range, from gigahertz to terahertz. Such measurements are particularly useful for the calibration of radio frequency and terahertz devices, as well as other applications like near field imaging of electric fields. We utilize frequency modulated spectroscopy with active control of residual amplitude modulation to improve the signal to noise ratio of the optical readout of
more » ... berg atom-based radio frequency electrometry. Matched filtering of the signal is also implemented. Although we have reached similarly, high sensitivity with other read-out methods, frequency modulated spectroscopy is advantageous because it is well-suited for building a compact, portable sensor. In the current experiment, ∼ 3 μ V cm^-1Hz^-1/2 sensitivity is achieved and is found to be photon shot noise limited.
doi:10.1364/oe.25.008625 pmid:28437940 fatcat:zzlbactoejcgbkdsetfr7tuqhy