Holographic projector using one lens
ABSTRACT It is shown that the lens count in a Fourier holographic projector can be reduced by encoding the equivalent lens power in sets of Fresnel holograms. By using appropriately calculated Fresnel holograms in a reflective configuration to effectively share a lens between the beam-expansion and demagnification stages of a holographic projector, a reduction in lens count from four to one is demonstrated.
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- "Digital holographic display is a promising technique, because a wavefront of light scattered from an object can be appropriately reconstructed from the display; therefore, this property will enable the realization of an ideal threedimensional display and projector. Holographic projections      have unique properties, including multi-projection  ( by which a multi-image is projected on multiple screens), projection on screens of arbitrary surface, and lensless zoom-able holographic projection   . The lensless zoomable holographic projection will lead to the development of an ultra-small projector. "
ABSTRACT: Our proposed method of random phase-free holography using virtual convergence light can obtain large reconstructed images exceeding the size of the hologram, without the assistance of random phase. The reconstructed images have low-speckle noise in the amplitude and phase-only holograms (kinoforms); however, in low-resolution holograms, we obtain a degraded image quality compared to the original image. We propose an iterative random phase-free method with virtual convergence light to address this problem.Optics Communications 04/2015; 355. DOI:10.1016/j.optcom.2015.07.030
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- "The algorithms are based on iterative optimization: namely, they gradually retrieve phase information by calculating diffraction calculations between certain intensity patterns (normally more than two) while subject to amplitude and phase constraints. The applications of the algorithms include, for example, wavefront reconstruction   , holographic projection       and so on. Diffraction based encryption and decryption   , and steganography  were proposed . "
ABSTRACT: Diffraction calculations, such as the angular spectrum method, and Fresnel diffractions, are used for calculating scalar light propagation. The calculations are used in wide-ranging optics fields: for example, computer generated holograms (CGHs), digital holography, diffractive optical elements, microscopy, image encryption and decryption, three-dimensional analysis for optical devices and so on. However, increasing demands made by large-scale diffraction calculations have rendered the computational power of recent computers insufficient. We have already developed a numerical library for diffraction calculations using a graphic processing unit (GPU), which was named the GWO library. However, this GWO library is not user-friendly, since it is based on C language and was also run only on a GPU. In this paper, we develop a new C++ class library for diffraction and CGH calculations, which is referred as to a CWO++ library, running on a CPU and GPU. We also describe the structure, performance, and usage examples of the CWO++ library.Computer Physics Communications 07/2011; 183(5). DOI:10.1016/j.cpc.2011.12.027
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ABSTRACT: We propose a color holographic projection using the space-division method, which can reconstruct a two-dimensional color image by one hologram and avoid the superimposing of unwanted images on a wanted image. We calculated three holograms corresponding to red, green and blue, and then generated one hologram to add the three holograms. The three holograms were optimized by the Gerchberg-Saxton algorithm for improvement of reconstructed color images. We numerically evaluated the image quality of color reconstructed images in terms of the color space of YCbCr, and compared the quality of color reconstructed images by the space-division method with that of reconstructed color images using another color holographic projection method.Optics Express 05/2011; 19(11):10287-92. DOI:10.1364/OE.19.010287