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Journal of Shaanxi Normal University

Study on the dispersion properties of type atoms in a confined system

Niu Jian-jun

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

To examine the dispersion properties of type atoms confined in between two dielectric walls. Near the Raman detuning,the fast variation of the dispersion lines corresponding to the very narrow dips of electromagnetically induced transparency(EIT) demonstrates a strong reduction of the group velocity of the probe light in a confined system.

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To examine the dispersion properties of type atoms confined in between two dielectric walls. Near the Raman detuning,the fast variation of the dispersion lines corresponding to the very narrow dips of electromagnetically induced transparency(EIT) demonstrates a strong reduction of the group velocity of the probe light in a confined system.
The dispersive properties of the atomic transition in the rubidium D2{D}_{2}D2​ line ($5{S}_{\frac{1}{2}}\ensuremath{-}5{P}_{\frac{3}{2}}$) at 780.0 nm are measured with a Mach-Zehnder interferometer when an additional coupling field at 775.8 nm is applied to an upper transition ($5{P}_{\frac{3}{2}}\ensuremath{-}5{D}_{\frac{5}{2}}$). This ladder-type system is observed to exhibit electromagnetically induced transparency together with a rapidly varying refractive index. A reduction in group velocity for the probe beam (vg=c13.2{v}_{g}=\frac{c}{13.2}vg​=13.2c​) is inferred from the measured dispersion curve with 52.5% suppressed absorption on resonance.
The unexpected dispersion properties of transmitting wave from a thin vapor of cascade three level atoms confined between two dielectric walls are theoretically discussed.The line shapes exhibit a Dicke-narrowing type sub-Doppler structure as a result of the slowest atoms contribution and the velocity selection in pump-probe regime.It is also found that there is a strong reduction of the group velocity of light shown by the fast variation of the dispersion in the vicinity of resonance.Because of velocity selection,the line-widths are narrower and the reduction of the group velocity is more manifest in counter-propagation regime than they are in co-propagation regime.One also notes that there are two superimposed dispersion curves,the first of which corresponds to the optics pumping,and the other(the steeper) one to possible electromagnetically induced transparency.
The two-level atom can, for good reason, be considered the basic material structure for the study of quantum optics [1]. The two-level atom has played a fundamental role in studies of physical processes, including self-induced transparency (SIT), photon echoes, optical nutation, saturation spectroscopy, and, most recently, slow- and fast-light research. This latter field has recently been the subject of great activity, as researchers have learned how to utilize various physical processes to exert control over the velocity of propagation of light pulses through material systems [2]. This interest stems both from the intellectual intrigue in situations in which the velocity of light can be speeded up or slowed down by many orders of magnitude and the promise that such techniques might be useful for applications in fields such as telecommunications and optical computing [3‐6]. Most of the recent work in this field has made use of the process of electromagnetically induced transparency (EIT) to induce a narrow transparency region in an otherwise highly absorbing optical material [7, 8]. The rapid variation of the refractive index n associated with this transparency window then leads to a strong modification of the group velocity n g in accordance with the standard relation
An atomic transition that has been made transparent by applying an additional electromagnetic field exhibits a rapidly varying refractive index with zero group velocity dispersion at line center. A 10-cm-long Pb vapor cell at an atom density of 7\ifmmode\times\else\texttimes\fi{}1015{10}^{15}1015 atoms/cm3{\mathrm{cm}}^{3}cm3 and probed on its 283-nm resonance transition has a calculated optical delay of 83 ns [(c/VG{\mathit{V}}_{\mathit{G}}VG​)=250].