Abstract-Support-domain constrained phase retrieval algorithms in terahertz in-line digital holography reconstruction of a nonisolated amplitude object

Jiaqi Hu, Qi Li, and Yi Zhou
https://www.osapublishing.org/ao/abstract.cfm?uri=ao-55-2-379

Phase retrieval algorithms applied to in-line digital holography reconstruction can weaken interference from the region outside the study target and an unstable light source, etc., by adopting the object-plane support domain constraint. Based on threshold segmentation and morphological filtering, a method to directly calculate the object-plane support domain is proposed in this paper. Combined with the above method, an improved support-domain constrained phase retrieval algorithm is presented. Then, imaging simulations and experiments on terahertz in-line digital holography reconstruction of nonisolated objects are conducted. The simulations study the influence of transmittance of the background plate, structural element of morphological filtering, etc., on the reconstruction effect of the improved algorithm without noise interference. Simulation and experiment results suggest that good reconstructed images can be obtained by this algorithm when transmittance of the background plate is greater than 0.90.

© 2016 Optical Society of America

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Abstract-Research on object-plane constraints and hologram expansion in phase retrieval algorithms for CW terahertz inline digital holography reconstruction

Jiaqi Hu, Qi Li, and Shanshan Cui
http://www.opticsinfobase.org/ao/upcoming_pdf.cfm?id=217516

In terahertz inline digital holography, the zero-order diffraction light and conjugate image cause reconstructed image misty. In this paper, three phase retrieval algorithms with different object-plane constrain are applied to conduct reconstruction under the same near-field diffraction propagation conditions and image-plane constraint. The impacts of different object-plane constraints on terahertz inline digital holographic reconstruction are studied. The results show that it is not suitable for phase retrieval algorithm to impose restriction on the phase when the object is a little complicated in the terahertz inline digital holography. In addition, the effects of zero-padding expansion, boundary replication expansion and apodization operation on reconstructed images are studied. The results indicate that the conjugate image can be eliminated and a better reconstructed image can be obtained by adopting appropriate phase retrieval algorithm after the normalized hologram extending to the minimum area which meets the applicable range of angular spectrum reconstruction algorithm by means of boundary replication.