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Physical Review Letters

Enhanced Isotope Discrimination Using Electromagnetically Induced Transparency

A. Kasapi

Published Aug 5, 1996• 29 citations
Publisher

Abstract

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% ${}^{207}$Pb is clearly seen against a background of ${}^{208}$Pb.

DOI
10.1103/physrevlett.77.1035

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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.
We report the results of an experiment showing how an opaque atomic transition in neutral Sr may be rendered transparent to radiation at its resonance frequency. This is accomplished by applying an electromagnetic coupling field (Fig. 1) between the upper state 4d5d1D2 of the transition and another state 4d5p 1D2 of the atom. When the Rabi frequency of the coupling field exceeds the inhomogeneous width of the 5s5p1P1−4d5d1D2 transition, the medium becomes transparent on line center. In this work, we have changed the transmittance of neutral strontium from exp(−20) without a coupling laser to exp(−1) in the presence of a coupling laser, over a spectral range of 6 GHz (Fig. 2). The coupling laser that we have used is a single mode Littman dye laser with an intensity of 10 MW/ cm2 .
We report the first demonstration of a technique by which an optically thick medium may be rendered transparent. The transparency results from a destructive interference of two dressed states which are created by applying a temporally smooth coupling laser between a bound state of an atom and the upper state of the transition which is to be made transparent. The transmittance of an autoionizing (ultraviolet) transition in Sr is changed from exp(-20) without a coupling laser present to exp(-1) in the presence of a coupling laser.
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].
Coupled-resonance spectroscopy has been recently reported and applied for spectroscopic measurements and laser stabilizations. With coupled-resonance spectroscopy, one may indirectly measure some transitions between the excited states that are hard to be measured directly because of the lack of populations in the excited states. An improvement of the coupled-resonance spectroscopy by combining the technology of electromagnetically induced transparency (EIT) is proposed. The coupled-resonance spectroscopy signal can be significantly enhanced by EIT. Several experimental schemes have been discussed. The line shape of the EIT-enhanced coupled-resonance spectroscopy has been calculated.The EIT-enhanced coupled-resonance spectroscopy can be used for simultaneously stabilizing two lasers to the same atomic source.