The Equivalence theorem for the spectral density of light waves on weak scattering is discussed. It is shown that when a spatially coherent plane light wave is scattered from two entirely different media, the far-zone spectral density may have identical distribution provided the low-frequency antidiagonal spatial Fourier components of the correlation function of the media are the same. An example of light waves on scattering from a Gaussian Schell model medium is discussed, and the condition on which two different media may produce identical spectral densities is presented.
© 2014 Optical Society of America
Original Manuscript: March 31, 2014
Manuscript Accepted: May 22, 2014
Published: June 23, 2014
Tao Wang, Xiaoling Ji, and Daomu Zhao, "Equivalence theorem for the spectral density of light waves on weak scattering," Opt. Lett. 39, 3837-3840 (2014)