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Chinese Physics Letters

The Inversionless Amplification in a Tripod System of 87 Rb Atoms in a Magneto-optical Trap

Zhen Sun, Feng-Dong Jia, Shuang-Fei Lv, Ya-Ping Ruan, Bo Qing, Ping Xue, Xiang-Yuan Xu, Xingcan Dai, Zhi-Ping Zhong

Published Apr 1, 2014• 2 citations
Publisher

Abstract

The probe transmission spectra around the atomic transition 5 2 S 1/2 , F = 2 → 5 2 P 3/2 ,F′ = 2 of 87 Rb are measured in a magneto-optical trap by adding a coupling field around the atomic transition 5 2 S 1/2 , F = 2 → 5 2 P 3/2 ,F′ = 2. The inversionless amplification is observed in the spectrum over the atomic transition 5 2 S 1/2 , F = 2 → 5 2 P 3/2 ,F′ = 2. The tripod electromagnetically induced transparency is proposed to account for the amplification feature, in which population distributions among these related atomic levels play an important role.

DOI
10.1088/0256-307x/31/4/043201

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Observation of dual electromagnetically induced transparencies in cold 87Rb^{87}Rb87Rb atoms
We have observed two dual electromagnetically induced transparency (EIT) spectra in probe transmission through cold 87Rb^{87}Rb87Rb atoms trapped in a magneto-optical trap (MOT). These dual EIT peaks are generated in two different N-systems formed by probe, coupling and control beams interacting with different levels in D2D_{2}D2​ line transitions of 87Rb^{87}Rb87Rb atom. The dependence of spectral features of two N-systems on driving beams (\textit{i.e.} coupling and control beams) strength and detuning has been investigated. The results show that the dual EIT spectral features in both the N-systems can be manipulated by varying the strength and detuning of both the driving beams. The two N-systems have been modelled theoretically using a density matrix formalism and results have shown a reasonable agreement with the experimental observations.
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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.