Resolution and field of view improvement in digital holography using a VCSEL source array

We describe a new implementation capable to produce superresolution (SR) and object field of view (FOV) improvement in digital lensless Fourier holography. The method provides synthetic aperture (SA) generation using angular multiplexing incoming from a Vertical Cavity Surface Emitting Laser (VCSEL) source array. SR imaging in a single exposure is obtained after proper digital processing of a multiplexed hologram coming from the incoherent addition of multiple sub-holograms, each one corresponding with a different source of the VCSEL array. FOV improvement in addition with SR imaging is achieved by recording a set of individual holograms obtained by sequential activation of the VCSEL sources. The former works in a single CCD snap-shot but having FOV limitation while the latter implies time multiplexing without FOV restriction. Experimental results validate an improvement in both resolution and FOV as well as in image quality.