Maximal refraction and superluminal propagation in a gaseous nanolayer
Physical review letters, 2012•APS
We present an experimental measurement of the refractive index of high density Rb vapor in
a gaseous atomic nanolayer. We use heterodyne interferometry to measure the relative
phase shift between two copropagating laser beams as a function of the laser detuning and
infer a peak index n= 1.26±0.02, close to the theoretical maximum of 1.31. The large index
has a concomitant large index gradient creating a region with steep anomalous dispersion
where a subnanosecond optical pulse is advanced by> 100 ps over a propagation distance …
a gaseous atomic nanolayer. We use heterodyne interferometry to measure the relative
phase shift between two copropagating laser beams as a function of the laser detuning and
infer a peak index n= 1.26±0.02, close to the theoretical maximum of 1.31. The large index
has a concomitant large index gradient creating a region with steep anomalous dispersion
where a subnanosecond optical pulse is advanced by> 100 ps over a propagation distance …
We present an experimental measurement of the refractive index of high density Rb vapor in a gaseous atomic nanolayer. We use heterodyne interferometry to measure the relative phase shift between two copropagating laser beams as a function of the laser detuning and infer a peak index , close to the theoretical maximum of 1.31. The large index has a concomitant large index gradient creating a region with steep anomalous dispersion where a subnanosecond optical pulse is advanced by over a propagation distance of 390 nm, corresponding to a group index , the largest negative group index measured to date.
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