Holography with incoherent light

Conventional digital holography uses the technique of combining two coherent light fields and the numerical reconstruction of the recorded hologram leads to the object amplitude and phase information. In spite of significant developments on the DH with coherent light, complex field imaging with arbitrary coherent source is also desired for various reasons. Here, we present a possible experimental approach for holography with the incoherent light. In case of incoherent light, the complex spatial coherence function is the measurable quantity and the incoherent object holograms are recorded as the coherence function. Thus, to record complex spatial coherence a square Sagnac radial shearing interferometer is designed with the phase-shifting approach. The five phase-shifting method helps to measure the fringe visibility and the corresponding phase, which jointly represents the complex coherence function. The back propagation of complex coherence function helps to retrieve the object information.