arXiv:0912.0836 · Journal of Physics B Atomic Molecular and Optical Physics

Electromagnetically induced transparency in cold85Rb atoms trapped in the ground hyperfineF= 2 state

V B Tiwari, S Singh, H S Rawat, Manoranjan P Singh, S C Mehendale

Published Apr 12, 2010• 15 citations

Abstract

We report electromagnetically induced transparency (EIT) in cold 85 Rb atoms, trapped in the lower hyperfine level F = 2, of the ground state 5 2 S 1/2 (Tiwari V B et al 2008 Phys. Rev. A 78 063421). Two steady-state Λ-type systems of hyperfine energy levels are investigated using probe transitions into the levels F ′ = 2 and F ′ = 3 of the excited state 5 2 P 3/2 in the presence of coupling transitions F = 3 → F ′ = 2 and F = 3 → F ′ = 3, respectively. The effects of uncoupled magnetic sublevel transitions and coupling field's Rabi frequency on the EIT signal from these systems are studied using a simple theoretical model.

DOI: 10.1088/0953-4075/43/9/095503

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arXiv:0912.0836 · Journal of Physics B Atomic Molecular and Optical Physics

Electromagnetically induced transparency in cold85Rb atoms trapped in the ground hyperfineF= 2 state

V B Tiwari, S Singh, H S Rawat, Manoranjan P Singh, S C Mehendale

Published Apr 12, 2010• 15 citations

arXiv HTML PDF

Abstract

DOI: 10.1088/0953-4075/43/9/095503

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Comparison of Electromagnetically Induced Transparency (EIT) Spectra for Six-level Lambda $\Lambda$ and Five-level V-type SystemsComparison of Electromagnetically Induced Transparency (EIT) Spectra for Six-level Lambda $\Lambda$ and Five-level V-type Systems

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Electromagnetically induced transparency (EIT) is experimentally studied in a rubidium vapour cell (without buffer gas, both $^{87}$ Rb and $^{85}$ Rb present according to their natural abundance) kept within two-layers of $\mu(\mu)$ -metal shields to avoid the effect of Earth's magnetic field on the energy levels of atomic rubidium. An external cavity diode laser (ECDL), used as a low power probe laser, is locked to the hyperfine cross-over peak of $F = 2 \rightarrow F' = 2, 3$ transitions of $^{87}$ Rb. The frequency of another ECDL, the pump laser, is set to scan the $F=1 \rightarrow F' = 0, 1, 2$ transitions of $^{87}$ Rb. These form the $\Lambda$ -type six level system. In the V-type system, both the pump and the probe lasers share the same $F = 2$ ground level. The probe beam coming out of the cell is detected by a low noise fast photodetector. The resulting spectra show signature of EIT in the "peak" for the $\Lambda$ -type system and in the "dip" for the V-type system. Numerical calculation based simulated spectra are also compared with the experimental spectra. In both the cases very narrow EIT linewidth $(\Gamma_{t} < \Gamma)$ is observed even at high value of pump Rabi-frequency $(\Omega_{c}\gg \Gamma)$ . Narrower value of EIT linewidth is due to Doppler averaging phenomena.Electromagnetically induced transparency (EIT) is experimentally studied in a rubidium vapour cell (without buffer gas, both $^{87}$Rb and $^{85}$Rb present according to their natural abundance) kept within two-layers of $\mu(\mu)$-metal shields to avoid the effect of Earth's magnetic field on the energy levels of atomic rubidium. An external cavity diode laser (ECDL), used as a low power probe laser, is locked to the hyperfine cross-over peak of $F = 2 \rightarrow F' = 2, 3$ transitions of $^{87}$Rb. The frequency of another ECDL, the pump laser, is set to scan the $F=1 \rightarrow F' = 0, 1, 2$ transitions of $^{87}$Rb. These form the $\Lambda$-type six level system. In the V-type system, both the pump and the probe lasers share the same $F = 2$ ground level. The probe beam coming out of the cell is detected by a low noise fast photodetector. The resulting spectra show signature of EIT in the "peak" for the $\Lambda$-type system and in the "dip" for the V-type system. Numerical calculation based simulated spectra are also compared with the experimental spectra. In both the cases very narrow EIT linewidth $(\Gamma_{t} < \Gamma)$ is observed even at high value of pump Rabi-frequency $(\Omega_{c}\gg \Gamma)$. Narrower value of EIT linewidth is due to Doppler averaging phenomena.

Journal of Atomic Molecular Condensate and Nano PhysicsDec 4, 20152 citations

Observation of transient effects in electromagnetically induced transparency (EIT) is reported in

{\mathrm{Rb}}^{85}

cooled in a magneto-optical trap. The transmission of a weak probe beam in resonance with the

{5S}_{1/2}(F=3)

{5P}_{3/2}(F=3)

hyperfine transition increased transiently when a relatively strong coupling field in resonance with the

{5S}_{1/2}(F=2)

{5P}_{3/2}(F=3)

hyperfine transition was switched on rapidly using a Pockels cell. The probe transient showed an initial Rabi half-cycle overshoot before settling down to steady-state EIT. The results agreed well with computations using a three-state model of the \ensuremath{\Lambda} system. The computations also suggest that transient gain should be observed with coupling field power only four times larger than that presently available to us.

Comparison of Electromagnetically Induced Transparency (EIT) Spectra for Six-level Lambda

\Lambda

and Five-level V-type Systems

Electromagnetically induced transparency (EIT) is experimentally studied in a rubidium vapour cell (without buffer gas, both

^{87}

Rb and

^{85}

Rb present according to their natural abundance) kept within two-layers of

\mu(\mu)

-metal shields to avoid the effect of Earth's magnetic field on the energy levels of atomic rubidium. An external cavity diode laser (ECDL), used as a low power probe laser, is locked to the hyperfine cross-over peak of

F = 2 \rightarrow F' = 2, 3

transitions of

^{87}

Rb. The frequency of another ECDL, the pump laser, is set to scan the

F=1 \rightarrow F' = 0, 1, 2

transitions of

^{87}

Rb. These form the

\Lambda

-type six level system. In the V-type system, both the pump and the probe lasers share the same

F = 2

ground level. The probe beam coming out of the cell is detected by a low noise fast photodetector. The resulting spectra show signature of EIT in the "peak" for the

\Lambda

-type system and in the "dip" for the V-type system. Numerical calculation based simulated spectra are also compared with the experimental spectra. In both the cases very narrow EIT linewidth

(\Gamma_{t} < \Gamma)

is observed even at high value of pump Rabi-frequency

(\Omega_{c}\gg \Gamma)

. Narrower value of EIT linewidth is due to Doppler averaging phenomena.