Abstract

Theoretical analysis shows that, to improve the resolution and the range of the field of view of the reconstructed image in digital lensless Fourier transform holography, an effective solution is to increase the area and the pixel number of the recorded digital hologram. A new approach based on the synthetic aperture technique and use of linear CCD scanning is presented to obtain digital holographic images with high resolution and a wide field of view. By using a synthetic aperture technique and linear CCD scanning, we obtained digital lensless Fourier transform holograms with a large area of 3.5cm×3.5cm (5000×5000 pixels). The numerical reconstruction of a 4mm object at a distance of 14cm by use of a Rayleigh–Sommerfeld integral shows that a theoretically minimum resolvable distance of 2.57μm can be achieved at a wavelength of 632.8nm. The experimental results are consistent with the theoretical analysis.

© 2008 Optical Society of America

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