Abstract
This paper presents a holographic projection display in which a phase-only spatial light modulator (SLM) performs three functions: beam shaping, image display, and speckle reduction. The functions of beam shaping and image display are performed by dividing the SLM window into four sub-windows loaded with different diffractive phase elements (DPEs). The DPEs are calculated using a modified iterative Fourier transform algorithm (IFTA). The function of speckle reduction is performed using temporal integration of display images containing speckles. The speckle contrast ratio of the display image is 0.39 due to the integration of eight speckled images. The system can be extended to display full-color images also by using temporal addition of elementary color images. Because the system configuration needs only an SLM, a Fourier transform lens, and two mirrors, the system volume is very small, becoming a potential candidate for micro projectors.
Highlights
The framework of digital holography can be presented as a three-stage process: hologram acquisition, hologram processing, and hologram reconstruction [1]
We present a holographic projection display scheme that requires very limited
In this article,it we present holographic projection display scheme that requires very volume because needs only a aphase-only
Summary
The framework of digital holography can be presented as a three-stage process: hologram acquisition, hologram processing, and hologram reconstruction [1]. HPD,optical both thelenses pixel needed, times larger When than that of beam-shaping beams It can be achieved without dimension of the SLM and the diameter of the laser beam are small enough to generate far-field especially when SLM pixel is much smaller. This makes it possible to use only a few additional optical diffraction within the volume of the system without using any optical lenses. Small SLM pixels are required because the beam dimension is several times larger than that of beam-shaping beams It can be achieved without optical lenses needed, especially pixel isSLM much smaller.
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