Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:1104.3427 · Physical Review A

Interacting double dark resonances in a hot atomic vapor of helium

Santosh Kumar, T. Lauprêtre, Rupamanjari Ghosh, Fabien Bretenaker, Fabienne Goldfarb

Published Aug 9, 2011• 17 citations
arXivHTMLPDF

Abstract

We experimentally and theoretically study two different tripod configurations using metastable helium (${}^{4}$He*), 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.

DOI
10.1103/physreva.84.023811

Related papers

Interacting double dark resonances in a tripod system of room-temperature4He

S. Kumar, T. Lauprêtre, C. Proux +3 more

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.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Dec 29, 2010•0 citations

Bichromatic electromagnetically induced transparency in hot atomic vapors

Hui Yan, Kai-Yu Liao, Jian‐Feng Li +3 more

In a three-level $\ensuremath{\Lambda}$ atomic system coupled by a symmetrical bichromatic laser field, a weak probe laser field shows multiple absorption peaks in the case of cold atoms. As for hot atomic vapors, we experimentally observe double symmetrical electromagnetically induced transparency windows instead of multiple absorption peaks. This abnormal spectrum is due to the Doppler averaging. The electromagnetically induced transparency windows observed here are useful for obtaining slow photons at different frequencies.

Physical Review A•May 1, 2013•18 citations

Polarization-dependent manipulation of optical properties in a tripod system

Santosh Kumar, T. Lauprêtre, Fabien Bretenaker +2 more

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 (${}^{4}$He*) 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.

Physical Review A•Aug 27, 2013•11 citations

Observation of the quantum interference phenomenon induced by interacting dark resonances

Ying-Cheng Chen, Yean-an Liao, Hsin‐Ying Chiu +2 more

We report an experimental observation of narrow and high-contrast spectra, which are induced by interacting dark resonances and have been predicted in Phys. Rev. A 60, 3225 (1999). Spectra are measured with cold ${}^{87}\mathrm{Rb}$ atoms produced by a magneto-optical trap. In this experimental system, a coupling laser and a weak probe laser form a three-level \ensuremath{\Lambda}-type configuration of electromagnetically induced transparency (EIT); a microwave drives a magnetic-dipole transition between the fourth level and the ground state that is coupled with the excited state by the coupling laser. The observed spectral profile of probe absorption exhibits a very sharp peak emerging inside a narrow EIT dip. Such spectral feature provides more opportunities in manipulating atomic-optical response.

Physical Review A•Oct 2, 2001•84 citations

Sub-Doppler and subnatural narrowing of an absorption line induced by interacting dark resonances in a tripod system

Chana Goren, A. D. Wilson‐Gordon, M. Rosenbluh +1 more

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.

Physical Review A•Jun 2, 2004•76 citations

Destructive Interference of Dark Resonances in a Room Temperature Tripod System

S. Kumar, T. Lauprêtre, Fabien Bretenaker +2 more

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.

Advanced Photonics•Jan 1, 2011•0 citations
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 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.
In a three-level $\ensuremath{\Lambda}$ atomic system coupled by a symmetrical bichromatic laser field, a weak probe laser field shows multiple absorption peaks in the case of cold atoms. As for hot atomic vapors, we experimentally observe double symmetrical electromagnetically induced transparency windows instead of multiple absorption peaks. This abnormal spectrum is due to the Doppler averaging. The electromagnetically induced transparency windows observed here are useful for obtaining slow photons at different frequencies.
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.
We report an experimental observation of narrow and high-contrast spectra, which are induced by interacting dark resonances and have been predicted in Phys. Rev. A 60, 3225 (1999). Spectra are measured with cold 87Rb{}^{87}\mathrm{Rb}87Rb atoms produced by a magneto-optical trap. In this experimental system, a coupling laser and a weak probe laser form a three-level \ensuremath{\Lambda}-type configuration of electromagnetically induced transparency (EIT); a microwave drives a magnetic-dipole transition between the fourth level and the ground state that is coupled with the excited state by the coupling laser. The observed spectral profile of probe absorption exhibits a very sharp peak emerging inside a narrow EIT dip. Such spectral feature provides more opportunities in manipulating atomic-optical response.
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.