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Advanced Photonics

Destructive Interference of Dark Resonances in a Room Temperature Tripod System

S. Kumar, T. Lauprêtre, Fabien Bretenaker, R. Ghosh, Fabienne Goldfarb

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We explore the response of a tripod system in 4He* under excitation by perpendicularly polarized pump and probe beams in the presence of a transverse magnetic field. Destructively interfering dark resonances are observed and interpreted.
DOI
10.1364/anic.2011.jtub4

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We experimentally study two different tripod configurations using metastable 4He, with the probe perpendicular and parallel to the quantization axis, defined by an applied weak magnetic field. In the first case, the two dark resonances interact incoherently and merge together into a single transparency peak with increasing coupling power. In the second case, we observe destructively interfering double dark resonances leading to a narrow absorption dip at the line center. We confirm the results theoretically.
We experimentally and theoretically study two different tripod configurations using metastable helium (4{}^{4}4He*), with the probe field polarization perpendicular and parallel to the quantization axis, defined by an applied weak magnetic field. In the first case, the two dark resonances interact incoherently and merge together into a single electromagnetically induced transparency peak with increasing coupling power. In the second case, we observe destructive interference between the two dark resonances inducing an extra absorption peak at the line center.
We analyze the dependence of the transmission profiles of an atom in a tripod configuration on the polarizations of the coupling and the probe beams and use room-temperature metastable helium (4{}^{4}4He*) as a model system. We show that, by rotating the orthogonally polarized coupling-probe beams with respect to an applied small magnetic field, one can manipulate the detuned peaks due to electromagnetically induced transparency [Kumar, Laupr\^etre, Ghosh, Bretenaker, and Goldfarb, Phys. Rev. A 84, 023811 (2011)] and the central peak arising because of ground-state coherent population oscillations [Laupr\^etre, Kumar, Berger, Faoro, Ghosh, Bretenaker, and Goldfarb, Phys. Rev. A 85, 051805(R) (2012)] observed earlier separately. Our experimental results match well with our numerical simulation using the Floquet method.
A method is presented for obtaining sub-Doppler and subnatural narrowing and increased absorption of a spectral line. The ultranarrow spectral line is confined between two closely spaced electromagnetically induced transparency windows in a nearly degenerate tripod atomic system formed by an ${F}_{g}=1\ensuremath{\rightarrow}{F}_{e}=0$ transition, split by a magnetic field. The system is driven by a $\ensuremath{\sigma}$-polarized pump and probed by a tunable $\ensuremath{\pi}$-polarized laser. It can be used to measure small magnetic fields and also as a magneto-optic switch.
A different type of optical resonance has been observed in Doppler-free saturated absorption spectroscopy when the pump beam has elliptical polarization slightly deviating from the ${\ensuremath{\sigma}}^{+}$ and the probe has ${\ensuremath{\sigma}}^{\ensuremath{-}}$ polarization. An interpretation in terms of competition between two trap states and a dressed-atom model is presented. The observed extreme sensitivity of the resonance frequency to the external magnetic field is attributed to the ``scissors effect'' of the dressed states' crossing point.