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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 14,
  • Issue 12,
  • pp. 120901-
  • (2016)

Increased depth of focus in random-phase-free holographic projection

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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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