Passive digital multispectral holography based on synthesis of coherence function

An interferometric method, called digital multispectral holography, to obtain three-dimensional (3D) multispectral images of spatially incoherent, polychromatic source distributions is presented. Each 3D spectral image is retrieved separately from a 3D spatial coherence function that is synthesized from interferograms measured with a two-axes wavefront folding interferometer. Numerical demonstration incorporated with spatially extended polychromatic source distribution, located at nearfield positions, shows that the 3D information of each spectral component is successfully retrieved by the method.