Improving the resolution in phase-shifting Gabor holography by CCD shift

L. Granero; V. Micó; Z. Zalevsky; J. García; B. Javidi

doi:10.1117/12.2184779

22 June 2015 Improving the resolution in phase-shifting Gabor holography by CCD shift

L. Granero, V. Micó, Z. Zalevsky, J. García, B. Javidi

Proceedings Volume 9525, Optical Measurement Systems for Industrial Inspection IX; 95253U (2015) https://doi.org/10.1117/12.2184779
Event: SPIE Optical Metrology, 2015, Munich, Germany

Abstract

Holography dates back to the year when Dennis Gabor reported on a method to avoid spherical aberration and to improve image quality in electron microscopy. Gabor’s two-step holographic method was pioneer but suffered from three major drawbacks: the reconstructed image is affected by coherent noise, the twin image problem of holography that also affects the final image quality, and a restricted sample range (weak diffraction assumption) for preserving the holographic behavior of the method. Nowadays, most of those drawbacks have been overcome and new capabilities have been added due to the replacement of the classical recording media (photographic plate) by digital sensors (CCD and CMOS cameras). But in the Gabor’ regime, holography is restricted to weak diffraction assumptions because otherwise, diffraction prevents an accurate recovery of the object's complex wavefront. In this contribution, we present an experimental approach to overcome such limitation and improve final image resolution. We use the phase-shifting Gabor configuration while the CCD camera is shifted to different off-axis positions in order to capture a bigger portion of the diffracted wavefront. Thus, once the whole image set is recorded and digitally processed for each camera's position, we merge the resulting band-pass images into one image by assembling a synthetic aperture. Finally, a superresolved image is recovered by Fourier transformation of the information contained in the generated synthetic aperture. Experimental results are provided using a USAF resolution test target and validating our concepts for a gain in resolution of close to 2.

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L. Granero, V. Micó, Z. Zalevsky, J. García, and B. Javidi "Improving the resolution in phase-shifting Gabor holography by CCD shift", Proc. SPIE 9525, Optical Measurement Systems for Industrial Inspection IX, 95253U (22 June 2015); https://doi.org/10.1117/12.2184779

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KEYWORDS

Charge-coupled devices

Holography

Spatial light modulators

Phase shifts

Digital holography

3D image reconstruction

Wavefronts

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