Ultranarrow CPO resonance in a Λ-type atomic system

Abstract

It is well known that ultranarrow electromagnetically induced transparency (EIT) resonances can be observed in atomic gases at room temperature. We report here the experimental observation of another type of ultranarrow resonances, as narrow as the EIT ones, in a Λ-system selected by light polarization in metastable 4He at room temperature. It is shown to be due to coherent population oscillations in an open two-level system (TLS). For perpendicular linearly polarized coupling and probe beams, this system can be considered as two coupled open TLSs, in which the ground state populations exhibit anti-phase oscillations. We also predict theoretically that in case of two parallel polarizations, the system would behave like a closed TLS, and the narrow resonance associated with these oscillations would disappear.

5 pages, 5 figures

References in corpus (3)

• All-Optical Delay of Images using Slow Light
• Observation of Ultra-narrow Electromagnetically Induced Transparency and Slow Light using Purely Electronic Spins in a Hot Atomic Vapor
• Probing degenerate two-level atomic media by coherent optical heterodyning

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• Observation of coherent population trapping in a V-type two-electron system
• Phase-sensitive amplification via coherent population oscillations in metastable helium at room temperature
• Polarization induced interference within electromagnetically induced transparency for atoms of double-V linkage
• Quantum properties of light propagating in a Coherent Population Oscillation Storage Medium