Slow-light effects invariably makeuse of the rapid variation of refractiveindex that occurs in the vicinityof a material resonance. Slow light,in which vg << c, can be achieved bymaking dn/dw large and positive;i.e., a situation of large normal chromaticdispersion. What is perhapsmost significant about the slow-lightresearch is not the magnitude of theeffect but rather the realization thatpulses can propagate through highlydispersive media with negligiblepulse distortion
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