Abstract
The recently proposed random-phase-free method enables holographic
reconstructions with very low noise, which allows fine projections without
time integration of sub-holograms. Here, we describe the additional
advantage of this method, namely, the extended depth of sharp imaging. It
can be attributed to a lower effective aperture of the hologram section
forming a given image point at the projection screen. We experimentally
compare the depth of focus and imaging resolution for various defocusing
parameters in the cases of the random-phase method and the
random-phase-free method. Moreover, we discuss the influence of the
effective aperture in the presence of local obstacles in the hologram’s
plane.
© 2016 Chinese Laser Press
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