Condition for invariant spectral degree of coherence of an electromagnetic plane wave on scattering

Within the accuracy of the first-order Born approximation, the condition for invariant spectral degree of coherence of an electromagnetic plane wave scattered from random media is presented. The condition for the electromagnetic plane wave is different from the one for the scalar plane wave. Results also indicate that, different polarizations of the incident plane wave would have essential effects on analytical forms of the condition. These effects may be due to the correlation-induced changes in the scattered spectral degree of coherence.