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arXiv · 1704.03139

Enhanced spectral profile in the study of Doppler-broadened Rydberg atoms

Bo-Han Wu·Ya-Wen Chuang·Yi-Hsin Chen·Jr-Chiun Yu·Ming-Shien Chang·Ite A. Yu
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Abstract

Combination of the electromagnetically-induced-transparency (EIT) effect and Rydberg-state atoms has attracted great attention recently due to its potential application in the photon-photon interaction or qubit operation. In this work, we studied the Rydberg-EIT spectra with room-temperature $^{87}$Rb atoms. Spectroscopic data under various experimental parameters all showed that the contrast of EIT transparency as a function of the probe intensity is initially enhanced, reaches a maximum value and then decays gradually. The contrast of spectral profile at the optimum probe field intensity is enhanced by $2-4$ times as compared with that at weak intensity. Moreover, the signal-to-noise ratio of the spectrum can potentially be improved by 1 or 2 order of magnitude. We provided a theoretical model to explain this behavior and clarified its underlying mechanism. Our work overcomes the obstacle of weak signal in the Rydberg-EIT spectrum caused by an apparent relaxation rate of the Rydberg polariton and weak coupling transition strength, and provides the useful knowledge for the Rydberg-EIT study.

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Bo-Han Wu, Ya-Wen Chuang, Yi-Hsin Chen, Jr-Chiun Yu, Ming-Shien Chang, Ite A. Yu. 2017-04-11. Enhanced spectral profile in the study of Doppler-broadened Rydberg atoms. https://doi.org/10.1038/s41598-017-09953-0

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