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Journal of the Optical Society of Korea

Observation of the Electromagnetically Induced Transparency and Dispersion-like Structure in Trapped Cs Atoms

Kyoung-Dae Kim, Mi-Rang Kwon, Jung Bog Kim, Han Seb Moon

Published Dec 1, 2001• 4 citations
Publisher

Abstract

We report experiemtnal results demonstrating the electromagnetically induced transparency (EIT) in trapped Cs atoms. EIT occurs at the Λ-type configuration where the re0-pumping laser simultaneously plays a role as the coupling laser in the presence of a magneto-optical trapping and weak magnetic fields. Dependences of EIT signal on both the intensity and the detuning of the coupling laser were investigated. Linear absorption spectra for cold cesium atoms in the magneto-optical trap have been observed and shown the pronounced dispersion-like structure with sub-natural linewidth of 1 MHz due to the cooling laser.

DOI
10.3807/josk.2001.5.4.131

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We report experiemtnal results demonstrating the electromagnetically induced transparency (EIT) in trapped Cs atoms. EIT occurs at the Λ-type configuration where the re0-pumping laser simultaneously plays a role as the coupling laser in the presence of a magneto-optical trapping and weak magnetic fields. Dependences of EIT signal on both the intensity and the detuning of the coupling laser were investigated. Linear absorption spectra for cold cesium atoms in the magneto-optical trap have been observed and shown the pronounced dispersion-like structure with sub-natural linewidth of 1 MHz due to the cooling laser.
Employing two lasers as the coupling and probe fields which have opposite circular polarization (σ + and σ -), electromagnetically induced transparency (EIT) in Λ-type Zeeman sublevels of cesium 6 2S 1/2F=3-6 2P 3/2F′=2 degenerate two-level system has been demonstrated via probe absorption spectra. The effect of the intensity and detuning of different coupling. Laser on EII was also investigated in experiments. Within the Doppler background, optical pumping among Zeeman sub-levels and the population of different Zeeman sub-levels can dominate the intensity of EIT effect. And the physical reason of the rugged spectra are presented qualitatively.
Abstract We experimentally studied the electromagnetically induced transparency (EIT) in cesium (Cs) vapors under a three-level V -configuration system. Two independent diode lasers were employed in locked and scanning mode, respectively, for pumping and probing the atomic media. A probe laser was scanned across 6 S 1/2 ( F = 4) to all subsutructures of 6 P 3/2 ( F ′ = 5 , F ′ = 4 and F ′ = 3 ) and the pump was locked at F ′ = 5 or F ′ = 4 or F ′ = 3 of 6 P 3/2 . A good agreement of the experimental results with theoretical simulations was observed. The intensity and magnetic field dependence of the EIT spectrum in a V -type system of Cs atoms was also studied.
We have observed electromagnetically induced absorption (EIA) spectra depending on intensities and detunings of the coupling field in the cycling transition (6S 1/2 , F = 4↔6P 3/2 , F ' = 5) of the Doppler-broadened Cs atomic system. With a weak coupling field, we were able to see an EIA spectrum with a subnatural linewidth. On increasing the intensity of the coupling laser, we found that a transmission dip produced by an electromagnetically induced transparency appeared at the centre of the EIA structure, which is the first time that this has been observed. By detuning the frequency of the coupling laser, we were able to obtain a clear dispersion-like spectrum for blue-side detuning, but we obtained a complicated shape for red-side detuning because of the influences of other hyperfine levels. These results were compared qualitatively with theoretical curves obtained from a simple model.
The electromagnetically induced absorption and electromagnetically induced transparency spectra of degenerate two-level systems with a strong coupling laser were observed. The frequency detuning and intensity effect of the coupling laser were demonstrated simultaneously. A dispersion-like spectrum can be obtained when the coupling laser is situated at blue-side detuning. The absorption inversion was realized when the coupling laser intensity is small. The coherent resonance has a linewidth much narrower than the natural linewidth of the optical transitions.
We experimentally measured the relative contrast of an electromagnetically-induced transparency (EIT) spectrum with two cw lasers in a Λ-type system of magneto-optically trapped 87 Rb atoms, which is a perturbed cold atomic medium. The contrast depends nonlinearly on the power of the coupling beam. Experimental results showed good agreement qualitatively with the simulation results considering the trapping magnetic field gradient, which induced detuning of the coupling laser. We used a free expanding cold atomic cloud that had a temperature of (36 ± 1) µK. To observe the EIT spectrum in the non-perturbed medium, we used two pulsed lasers. We observed that the relative contrast in the unperturbed medium was three times higher than that in the perturbed medium under our experimental conditions.
Absorption spectra of cold caesium atoms confined in a magneto-optical trap are measured around D 2 line at 852nm with a weak probe beam. Absorption reduction dip due to electromagnetically induced transparency (EIT) effect induced by the cooling/trapping field in a V-type three-level system and a gain peak near the cycling transition are clearly observed. Several mechanisms mixed with EIT effect in a normal V-type three-level system are briefly discussed. A simple theoretical analysis based on a dressed-state model is presented for interpretation of the absorption spectra.