Phys. Rev. Lett. 90, 113903 (2003) [4 pages]Observation of Ultraslow Light Propagation in a Ruby Crystal at Room TemperatureReceived 31 October 2002; published 21 March 2003 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.113903
DOI:
10.1103/PhysRevLett.90.113903
PACS:
42.65.–k, 42.50.Gy
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