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Chinese Physics

Absorption spectroscopy of cold caesium atoms confined in a magneto-optical trap

闫树斌 Yan Shubin, Tao Liu, Tao Geng, Tiancai Zhang, Kunchi Peng, Junmin Wang

Published Sep 28, 2004• 7 citations
Publisher

Abstract

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.

DOI
10.1088/1009-1963/13/10/016

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Physical Review A•Oct 2, 2001•84 citations
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.
Pump?probe spectra of caesium D2 line are experimentally investigated in a Cs atomic vapour cell with co-propagating orthogonal linearly-polarized pump and probe laser beams. Absorption-reduction dips duo to electromagnetically induced transparency (EIT) in multi-?-type Zeeman sublevels of 6 S1/2 F=3?6 P3/2 F'=2 hyperfine transition and absorption-enhanced peaks due to electromagnetically induced absorption (EIA) in 6 S1/2 F=4?6 P3/2 F'=5 hyperfine transition are demonstrated. With detuned pump beam abnormal sign-reversed signals inside the EIT dip and the EIA peak are clearly observed.
We have studied a ladder and a Λ system on cold Cesium atoms released from a magneto optical trap. Probe absorption spectra have been satisfactorily interpreted in terms of a non degenerate three level model at low pump power. At higher power a sum of non interacting three level systems is adequate to predict line positions. An experimental test for a sum rule in nonlinear optics is presented and a novel type of dark trap that relies on electromagnetically induced transparency for a velocity selective storage in the dark state is demonstrated.
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.
Abstract We have investigated two N-systems in D 2 line transition of 87 Rb atoms theoretically and experimentally. The study has been carried out with cold 87 Rb atoms trapped in a magneto-optical trap. Each N-system has shown dual electromagnetically induced transparency (EIT) structure in probe transmission, which is qualitatively explained using dressed-state picture. The dependence of spectral features of N-systems on 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 coupling and control beams. The numerical modeling of the systems using density matrix formalism also explains the experimentally observed results.
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.