Field and intensity correlation in random media

We have obtained the spectral and spatial field correlation functions, C-E( Delta omega) and C-E(Deltax) respectively, from measurement of the microwav e field spectrum at a series of points along a line on the output of a rand om dielectric medium. C-E(Delta omega) and C-E(Deltax) are shown to be the Fourier transforms, respectively, of the time of Right distribution, obtain ed from pulsed measurements, and of the specific intensity. Unlike C-E(Delt a omega), the imaginary part of C-E(Deltax) is shown to vanish as a result of the isotropy of the correlation function in the output plane. The comple x square of the field correlation function gives the short-range or C-1 con tribution to the intensity correlation function C. Longer-range contributio ns to the intensity correlation function are obtained directly by subtracti ng C-1 from C and are in good agreement with theory.