&lt;title&gt;Multiphase computer-generated holograms for full-color image generation&lt;/title&gt;

Choi, Kyong Sik; Choi, Byong So; Choi, Yong Eui; Kim, Sun Il; Kim, Jong Man; Kim, Nam; Gil, Sang Keun

doi:10.1117/12.469274

Cited by 4 publications

(4 citation statements)

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“…It is well known that multi-level diffractive optics (also referred to as kinoforms) can achieve very high efficiencies at a single wavelength 6 , 7 . However, extension to full color computer-generated holograms is challenging and typically requires one device for each color 8 . In addition, such surface-relief devices required multi-step lithographic processes, exhibited relatively low diffraction efficiencies and required coherent illumination.…”

Section: Introductionmentioning

confidence: 99%

Full-color, large area, transmissive holograms enabled by multi-level diffractive optics

Mohammad

Meem

Wan

et al. 2017

Sci Rep

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We show that multi-level diffractive microstructures can enable broadband, on-axis transmissive holograms that can project complex full-color images, which are invariant to viewing angle. Compared to alternatives like metaholograms, diffractive holograms utilize much larger minimum features (>10 µm), much smaller aspect ratios (<0.2) and thereby, can be fabricated in a single lithography step over relatively large areas (>30 mm ×30 mm). We designed, fabricated and characterized holograms that encode various full-color images. Our devices demonstrate absolute transmission efficiencies of >86% across the visible spectrum from 405 nm to 633 nm (peak value of about 92%), and excellent color fidelity. Furthermore, these devices do not exhibit polarization dependence. Finally, we emphasize that our devices exhibit negligible absorption and are phase-only holograms with high diffraction efficiency.

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Section: Introductionmentioning

confidence: 99%

Full-color, large area, transmissive holograms enabled by multi-level diffractive optics

Mohammad

Meem

Wan

et al. 2017

Sci Rep

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“…To reduce the speckle noise effect due to utilizing a high coherence laser as the illumination source, a transmission-type diffusing screen can be placed at the viewer plane or a partially coherent light source can be used. For full-color 3D image generation, the optimization of gray-scaled red, green, and blue components (composing a full-color image) can be simply acquired by using a grating equation to reduce color dispersion among the holograms [24]. If color-optimized holograms are composed in the Fourier plane, it is possible to obtain superposed full-color stereoscopic images with binocular parallax.…”

Section: Simulation and Experimental Results For Auto-stereographymentioning

confidence: 99%

Synthetic phase holograms for auto-stereoscopic image displays using a modified IFTA

2004

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A Fourier-transformed synthetic phase hologram for an auto-stereoscopic image display system is proposed and implemented. The system uses a phase-only spatial light modulator and a simple projection lens module. A modified iterative Fresnel transform algorithm method, for the reconstruction of gray-level quantized stereo images with fast convergence, high diffraction efficiency and large signal-to-noise ratio is also described. Using this method, it is possible to obtain a high diffraction efficiency(~90%), an excellent signal-to-noise ratio(> 9.6dB), and a short calculation time(~3min). Experimentally, the proposed auto-stereoscopic display system was able to generate stereoscopic 3D images very well.

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“…Computer-generated hologram (CGH) or digital hologram [1][2][3][4] is a hologram made by a computer calculating the interference pattern that would be produced by an imaginary object wave and a reference beam. The CGH is fabricated by a semiconductor process or encoded by a programmable real-time spatial light modulator (SLM).…”

Section: Introductionmentioning

confidence: 99%

Full-color autostereoscopic video display system using computer-generated synthetic phase holograms

2005

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A full-color auto-stereoscopic video display system has been introduced and developed using only a single phase-only spatial light modulator, a simple projection lens module, and three laser diode sources with the wavelengths of 635nm (red), 532nm (green), and 473nm (blue). Full-color stereoscopic input video frames are separated by each red, green, and blue component with respect to each stereo eye view for a 3D image frame. Each hologram is then optimized by a modified iterative Fresnel transform algorithm method, for the reconstruction of each gray-level quantized stereo image without color dispersion. To solve the color dispersion problem we applied scaling constraints and phase-leveling techniques for each hologram. Then the optimized holograms are synthesized with direction-multiplexed holograms and modulated by a single phase-type spatial light modulator. The modulated signals are Fourier-transformed by an achromatic lens and redirected to each viewer's eye for the reconstruction of the composed full-color auto-stereoscopic 3D display. Experimentally, we demonstrated that the designed computer-generated holograms were able to generate full-color stereoscopic 3D video images without glasses.

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<title>Multiphase computer-generated holograms for full-color image generation</title>

Cited by 4 publications

References 0 publications

Full-color, large area, transmissive holograms enabled by multi-level diffractive optics

Full-color, large area, transmissive holograms enabled by multi-level diffractive optics

Synthetic phase holograms for auto-stereoscopic image displays using a modified IFTA

Full-color autostereoscopic video display system using computer-generated synthetic phase holograms

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