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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

An optical prism based on resonance ultra-dispersive media

Vladimir A. Sautenkov, Hebin Li, Yuri V. Rostovtsev, Marlan O. Scully

Published Feb 8, 2007• 0 citations
Publisher

Abstract

We have theoretically predicted and experimentally demonstrated an ultra-dispersive atomic prism made of coherently driven Rb atomic vapor. The prism posses spectral angular dispersion that six orders of magnetude higher than the prism made from optical glass; it is the highest spectral angular dispersion that has been ever shown (such angular dispersion allows one to resolve spatially light separated by a few kHz). The prism is working near the resonant frequency of atomic vapor, and its dispersion is optically controlled by coherent driving field.

DOI
10.1117/12.716477

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We have theoretically predicted and experimentally demonstrated an ultra-dispersive atomic prism made of coherently driven Rb atomic vapor. The prism posses spectral angular dispersion that six orders of magnetude higher than the prism made from optical glass; it is the highest spectral angular dispersion that has been ever shown (such angular dispersion allows one to resolve spatially light separated by a few kHz). The prism is working near the resonant frequency of atomic vapor, and its dispersion is optically controlled by coherent driving field.
We have experimentally demonstrated an ultra-dispersive optical prism made from a coherently driven Rb atomic vapor. The prism possesses spectral angular dispersion that is 6 orders of magnitude higher than that of a prism made of optical glass; such angular dispersion allows one to spatially resolve light beams with different frequencies separated by a few kilohertz. The prism operates near the resonant frequency of atomic vapor and its dispersion is optically controlled by a coherent driving field.
We present an atomic prism spectrometer that utilizes the steep linear dispersion between two strongly absorbing hyperfine resonances of rubidium. We resolve spectral lines 50 MHz apart and, utilizing a larger part of the available spectrum than only between the two resonances, we spatially separate collinear pump, signal, and idler beams resulting from a four-wave mixing process. Due to the high transparency possible between the resonances, these results have applications in the filtering of narrow-band entangled photons and interaction-free measurements.
Spectroscopic properties of coherently prepared, optically dense atomic media are studied experimentally and analyzed theoretically. It is shown that in such media the power broadening of the resonances can be substantially reduced. A density-dependent spectral narrowing of the electromagnetically induced transparency (EIT) window and novel, even narrower, resonances superimposed on the EIT line are observed in dense Rb vapor. A nonlinear two-photon spectroscopic technique based on coherent atomic media and combining high resolution with a large signal-to-noise ratio seems feasible.