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.
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,
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