Observation of Ultra-narrow Electromagnetically Induced Transparency and Slow Light using Purely Electronic Spins in a Hot Atomic Vapor
F. Goldfarb, J. Ghosh, M. David, J. Ruggiero, T. Chaneli\`ere, J.-L., Le Gou\"et, H. Gilles, R. Ghosh, and F. Bretenaker
TL;DR
This paper reports the first observation of ultra-narrow electromagnetically induced transparency in gaseous helium at room temperature, demonstrating slow light using purely electronic spins despite Doppler broadening.
Contribution
It introduces a novel observation of ultra-narrow EIT in helium with purely electronic spins at room temperature, highlighting the positive role of collisions.
Findings
Ultra-narrow EIT windows (<10 kHz) achieved in helium gas.
Collisions positively influence EIT resonance.
Measurement of slow light suggests potential applications.
Abstract
Electromagnetically induced transparency (EIT) is observed in gaseous 4He at room temperature. Ultra-narrow (less than 10 kHz) EIT windows are obtained for the first time for purely electronic spins in the presence of Doppler broadening. The positive role of collisions is emphasized through measurements of the power dependence of the EIT resonance. Measurement of slow light opens up possible ways to applications.
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