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Holography with incoherent light
1 , 2 , 2 , 1 , 3 , * 1
1  Laboratory of Information Photonics and Optical Metrology, Department of Physics, Indian Institute of Technology, (Banaras Hindu University), Varanasi, Uttar Pradesh, India
2  Applied and Adaptive Optics Laboratory, Department of Physics, Indian Institute of Space Science and Technology, Thiruvananthapuram-695547, India
3  Applied and Adaptive Optics Laboratory, Department of Physics, Indian Institute of Space Science and Technology, Thiruvananthapuram-695547
Academic Editor: VIJAYAKUMAR ANAND

Published: 04 March 2023 by MDPI in Holography Meets Advanced Manufacturing session Holography posters
Abstract:

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.

Keywords: Digital holography; Interference; Coherence; Phase-shifting
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The process of merging two coherent light beams is used in conventional digital holography, and the numerical reconstruction of the recorded hologram yields the object amplitude and phase information. Despite significant advances in coherent light DH, complicated field imaging with arbitrary coherent sources is also required for a variety of reasons. We describe a feasible experimental strategy for holography with incoherent light in this paper.
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