Negative Group Velocity

Details Negative Group Velocity Negative Group Velocity

2000-08-05

arxiv.org/abs/physics/0008013v4

Physics

Optics

v3 adds discussion of "rephasing", and adds a figure. v4 adds references to the early history of negative group velocity, and

Scientific paper

10.1119/1.1331304

The group velocity for pulses in an optical medium can be negative at frequencies between those of a pair of laser-pumped spectral lines. The gain medium then can amplify the leading edge of a pulse resulting in a time advance of the pulse when it exits the medium, as has been recently demonstrated in the laboratory. This effect has been called superluminal, but, as a classical analysis shows, it cannot result in signal propgation at speeds greater than that of light in vacuum.

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