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1 March 2013 Using electronic holography to generate speckle-free and shaded reconstructed images
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A hologram display technique that provides speckle-free and shaded reconstructed images is proposed. A three-dimensional (3D) object is composed of object points, which are divided into multiple object point groups displayed in a time-sequential manner. In each object point group, an array of object points are sparsely separated, so that interference does not occur between them. Each object point group is generated by displaying a two-dimensional (2D) array of zone plates on a high-speed spatial light modulator (SLM). The amplitude distribution of the zone plates is modulated two-dimensionally to control the angular intensity distribution of light emitted from the object points to shade reconstructed images. The SLM generates multiple binary images illuminated by different light powers to represent 2D modulated zone plates in a time-sequential manner. A Digital micromirror device (DMD) was used as the high-speed SLM. The resolution was 1,024 × 768, and the frame rate was 22.727 kHz. Each object point group consists of 16 × 24 object points. The reconstructed image consists of 16 × 8 object point groups to obtain a total of 256 × 192 object points. Eight binary images represented each object point group. The frame rate for 3D image generation was 22.2 Hz.
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Takayuki Kurihara and Yasuhiro Takaki "Using electronic holography to generate speckle-free and shaded reconstructed images", Proc. SPIE 8644, Practical Holography XXVII: Materials and Applications, 86440E (1 March 2013);

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