Image formation by multifacet holograms

Haugen, P. R.; Bartelt, Hartmut; Case, Steven K.

doi:10.1364/ao.22.002822

Cited by 11 publications

(2 citation statements)

References 8 publications

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“…Holographic Displays. Early holographic image formation models [1] have been adapted to create digital holograms [2]. Most of the common approaches require coherent light which has several disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Efficient freeform lens optimization for computational caustic displays

Damberg

Heidrich

2015

Opt. Express

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Phase-only light modulation shows great promise for many imaging applications, including future projection displays. While images can be formed efficiently by avoiding per-pixel attenuation of light most projection efforts utilizing phase-only modulators are based on holographic principles which rely on interference of coherent laser light and a Fourier lens. Limitations of this type of an approach include scaling to higher power as well as visible artifacts such as speckle and image noise. We propose an alternative approach: operating the spatial phase modulator with broadband illumination by treating it as a programmable freeform lens. We describe a simple optimization approach for generating phase modulation patterns or freeform lenses that, when illuminated by a collimated, broadband light source, will project a pre-defined caustic image on a designated image plane. The optimization procedure is based on a simple geometric optics image formation model and can be implemented computationally efficient. We perform simulations and show early experimental results that suggest that the implementation on a phase-only modulator can create structured light fields suitable, for example, for efficient illumination of a spatial light modulator (SLM) within a traditional projector. In an alternative application, the algorithm provides a fast way to compute geometries for static, freeform lens manufacturing.

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Section: Introductionmentioning

confidence: 99%

Efficient freeform lens optimization for computational caustic displays

Damberg

Heidrich

2015

Opt. Express

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“…Holographic image formation models (e.g., Lesem et al [1969]) have been adapted to create digital holograms [Haugen et al 1983] quite early in the history of phase SLMs. Holographic projection systems have been proposed in many variations for research and specialty applications, including pocket projectors [Buckley 2008].…”

Section: Holographic Displaysmentioning

confidence: 99%

High Brightness HDR Projection Using Dynamic Freeform Lensing

2016

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Cinema projectors need to compete with home theater displays in terms of image quality. High frame rate and spatial resolution as well as stereoscopic 3D are common features today, but even the most advanced cinema projectors lack in-scene contrast and, more important, high peak luminance, both of which are essential perceptual attributes of images appearing realistic. At the same time, HDR image statistics suggest that the average image intensity in a controlled ambient viewing environment such as the cinema can be as low as 1% for cinematic HDR content and not often higher than 18%, middle gray in photography. Traditional projection systems form images and colors by blocking the source light from a lamp, therefore attenuating between 99% and 82% of light, on average. This inefficient use of light poses significant challenges for achieving higher peak brightness levels.In this work, we propose a new projector architecture built around commercially available components, in which light can be steered to form images. The gain in system efficiency significantly reduces the total cost of ownership of a projector (fewer components and lower operating cost), and at the same time increases peak luminance and improves black level beyond what is practically achievable with incumbent projector technologies. At the heart of this computational display technology is a new projector hardware design using phase modulation in combination with a new optimization algorithm that is capable of on-the-fly computation of freeform lens surfaces.

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Space-variant filtering with holographic multifacet elements

Bartelt¹,

Sauer²

1985

Optics Communications

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Image formation by multifacet holograms

Cited by 11 publications

References 8 publications

Efficient freeform lens optimization for computational caustic displays

Efficient freeform lens optimization for computational caustic displays

High Brightness HDR Projection Using Dynamic Freeform Lensing

Space-variant filtering with holographic multifacet elements

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