Abstract
We present a new lensless incoherent holographic system operating in a synthetic aperture mode. Spatial resolution exceeding the Rayleigh limit of the system is obtained by tiling digitally several Fresnel holographic elements into a complete Fresnel hologram of the observed object. Each element is acquired by the limited-aperture system from different point of view. This method is demonstrated experimentally by combining three holographic elements recorded with white light illumination which is emitted from a binary grating.
Highlights
Synthetic aperture is a well-known super-resolution technique which extends the resolution capabilities of an imaging system beyond the theoretical Rayleigh limit dictated by the system's actual aperture
This method is limited to microscopy only, and it is a technique of recording incoherent holograms, a specimen should be illuminated by an interference pattern between two laser beams
The various elements, each of which is recorded by the real aperture system during the capturing time, are tiled together so that the final mosaic hologram is effectively considered as captured from a single synthetic aperture which is much wider than the actual aperture
Summary
Synthetic aperture is a well-known super-resolution technique which extends the resolution capabilities of an imaging system beyond the theoretical Rayleigh limit dictated by the system's actual aperture. Synthetic aperture carried out by a combination of several off-axis incoherent holograms in scanning holographic microscopy has been demonstrated by Indebetouw et al [4] This method is limited to microscopy only, and it is a technique of recording incoherent holograms, a specimen should be illuminated by an interference pattern between two laser beams. The holographic method proposed in this study is based on the recently invented system of a single-channel incoherent interferometer employed for generating digital Fresnel holograms [5,6,7] In this non-scanning holographic technique, incoherent light is reflected or emitted from a three dimensional (3-D) object, propagates through a spatial light modulator (SLM), and is recorded by a digital camera. The various elements, each of which is recorded by the real aperture system during the capturing time, are tiled together so that the final mosaic hologram is effectively considered as captured from a single synthetic aperture which is much wider than the actual aperture
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