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Phys Rev Lett. 2003 Mar 21;90(11):113903. Epub 2003 Mar 21.

Observation of ultraslow light propagation in a ruby crystal at room temperature.

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  • 1The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.


We have observed slow light propagation with a group velocity as low as 57.5+/-0.5 m/s at room temperature in a ruby crystal. A quantum coherence effect, coherent population oscillations, produces a very narrow spectral "hole" in the homogeneously broadened absorption profile of ruby. The resulting rapid spectral variation of the refractive index leads to a large value of the group index. We observe slow light propagation both for Gaussian-shaped light pulses and for amplitude modulated optical beams in a system that is much simpler than those previously used for generating slow light.

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