Interference and nonlinear properties of four-wave-mixing resonances in thermal vapor: Analytical results and experimental verification

Abstract

We develop a model to calculate nonlinear polarization in a nondegenerate four-wave mixing in diamond configuration which includes the effects of hyperfine structure and Doppler broadening. We verify the model against the experiment with $5^2{S}_{1/2}$, $5^2{P}_{3/2}$, $5^2{D}_{3/2}$ and $5^2{P}_{1/2}$ levels of rubidium 85. Treating the multilevel atomic system as a combination of many four-level systems we are able to express the nonlinear susceptibility of a thermal ensemble in a low-intensity regime in terms of Voigt-type profiles and obtain an excellent conformity of theory and experiment within this complex system. The agreement is also satisfactory at high intensity and the analytical model correctly predicts the positions and shapes of resonances. Our results elucidate the physics of coherent interaction of light with atoms involving higher excited levels in vapors at room temperature, which is used in an increasing range of applications.

arXiv comment8 pages, 5 figures, 1 table

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Cited by in corpus (16)

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• Study of a four-level system in vee + ladder configuration
• Quantum optics of spin waves through ac Stark modulation
• Amplified spontaneous emission at 5.23 um in two-photon excited Rb vapour
• Comparison of collimated blue light generation in ${}^{85}$Rb atoms via the D${}_1$ and D${}_2$ lines
• Spatially-resolved control of fictitious magnetic fields in a cold atomic ensemble
• Coupling of four-wave mixing and Raman scattering by ground-state atomic coherence
• Magneto-optical polarization rotation in a ladder-type atomic system for tunable offset locking
• Phase matching alters spatial multiphoton processes in dense atomic ensembles
• Magnetically tuned, robust and efficient filtering system for spatially multimode quantum memory in warm atomic vapors
• Creating a switchable optical cavity with controllable quantum-state mapping between two modes
• Multimode Raman light-atom interface in warm atomic ensemble as multiple three-mode quantum operations
• Superradiant parametric conversion of spin waves
• Pulsed Rydberg four-wave mixing with motion-induced dephasing in a thermal vapor
• Autler-Townes spectroscopy of a Rydberg ladder
• Detection of infrared light through stimulated four-wave mixing process