Increased depth of focus in random-phase-free holographic projection
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.
Tomoyoshi Shimobaba：Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 2 63-852 2 , Japan
and Tomoyoshi Ito：Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 2 63-852 2 , Japan
备注：This work was funded by the Polish National Centre for Research and Development (No. LIDER/013/469/L-4/12/NCBR/2013) and the Polish National Science Centre (No. 2015/17/B/ST7/03754).
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