Electromagnetically induced transparency with noisy lasers

Yanhong Xiao,Michael Crescimanno,Tun Wang,Susanne F Yelin,Maria Baryakhtar,Mikhail D Lukin,David F Phillips,Mackenzie Van Camp,Ronald L Walsworth,Michael Hohensee,Liang Jiang

doi:10.1103/physreva.80.041805

Abstract

We demonstrate and characterize two coherent phenomena that can mitigate the effects of laser phase noise for electromagnetically induced transparency (EIT): a laser-power-broadening-resistant resonance in the transmitted intensity cross correlation between EIT optical fields, and a resonant suppression of the conversion of laser phase noise to intensity noise when one-photon noise dominates over two-photon-detuning noise. Our experimental observations are in good agreement with both an intuitive physical picture and numerical calculations. The results have wide-ranging applications to spectroscopy, atomic clocks, and magnetometers.

Highlights

We demonstrate and characterize two coherent phenomena that can mitigate the effects of laser phase noise for Electromagnetically Induced Transparency (EIT): a laser-power-broadening-resistant resonance in the transmitted intensity cross-correlation between EIT optical fields; and a resonant suppression of the conversion of laser phase noise to intensity noise when one-photon noise dominates over two-photon-detuning noise
In this Letter, we demonstrate and present intuitive models for two coherent noise phenomena, that can mitigate the conversion of laser phase noise to intensity noise in EIT media: (i) a laser-power-broadening-resistant resonance observed in intensity cross-correlations between the two EIT optical fields; and (ii) resonant suppression of phasenoise-to-intensity-noise conversion, which occurs when one-photon noise dominates two-photon-detuning noise
We find experimentally that either a resonant peak or dip can appear in EIT intensity noise spectra, determined by the relative importance of one-photon noise and two-photon-detuning noise

Summary

Introduction

Yanhong, Tun Wang, Maria Baryakhtar, Mackenzie Van Camp, Michael Crescimanno, Michael Hohensee, Liang Jiang, et al 2009. We demonstrate and characterize two coherent phenomena that can mitigate the effects of laser phase noise for Electromagnetically Induced Transparency (EIT): a laser-power-broadening-resistant resonance in the transmitted intensity cross-correlation between EIT optical fields; and a resonant suppression of the conversion of laser phase noise to intensity noise when one-photon noise dominates over two-photon-detuning noise.

Results

Conclusion