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Physical Review Letters

Observation of electromagnetically induced transparency in collisionally broadened lead vapor

J. E. Field, Kenneth H. Hahn, Stephen E. Harris

Published Nov 25, 1991• 490 citations
Publisher

Abstract

We report the observation of electromagnetically induced transparency on the collisionally broadened resonance line of Pb vapor. By applying a 1064-nm laser beam, the transmission at 283 nm is increaesd by at least a factor of exp(10), with nearly all of the Pb atoms remaining in the ground state.
DOI
10.1103/physrevlett.67.3062

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Physical Review Letters•Aug 5, 1996•29 citations
In this paper, we report the observation of electromagnetically induced transparency in collisionally broadened lead vapor. Electromagnetically induced transparency based on lifetime broadening has been observed by Boiler et al), where transparency was induced by a quantum interference. We extend the regime of electromagnetically induced transparency to collisionaly broadened resonance lines. A strong field which couples a resonantly broadened state to another state with a smaller collisional rate decreases the loss, and the transmission of an optically thick media is increased from below our dynamic range (Io/Iin<10−6)to Io/Iin = 10−1
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].
Electromagnetically induced transparency is applied to isotope discrimination. By adjusting the intensity of a coupling laser, one isotope is made resonantly opaque while another is rendered transparent to a probe. Experimental results are shown in isotopically enriched atomic lead, where 0.03% 207{}^{207}207Pb is clearly seen against a background of 208{}^{208}208Pb.