Phase Velocity

The velocity with which phase fronts propagate in a medium.

In a vacuum the phase velocity is c = 299'792'458 m/s, independent of the optical frequency, and equals the group velocity. In a medium, the phase velocity is typically smaller by a factor of n, the refractive index, which is frequency-dependent. In the visible spectral region, typical Transparent crystals and glasses have refractive indices between 1.4 and 2.8. Semiconductors normally have somewhat higher values.

Related Terms
Birefringent Phase Matching,   Critical Phase Matching,   Cross phase Modulation,   Differential Phase (DP),   Group Velocity,   Noncritical Phase Matching,   Phase Constant,   Phase Matching,   Phase Matching Bandwidth,   Phase Modulators,  

External links for Phase Velocity
Phase Velocity on Wikipedia
Phase Velocity on Google
Phase Velocity on Yahoo!
Phase Velocity on Answers
Phase Velocity on The Free Dictionary

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