Results 181 to 190 of about 659,213 (221)

Design and fabrication of transmission phase holographic lens for solar application holographic lens for solar application

2015 2nd International Conference on Opto-Electronics and Applied Optics (IEM OPTRONIX), 2015
Holography has been utilized for fabrication of optical elements in Silver halide photosensitive emulsion. The main drawback of transmission phase holograms in silver halide emulsion is getting darkens or discolor over the period of time, whenexposed to the ambient light, known as print-out effect. Hence this is unsuitable for out-door applications. In
Vadivelan Varadarajan, Chandar Shekar Bellan   +1 more
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Imaging Characteristics of a Volume Holographic Lens

Proceedings of SPIE, 2009
A volume holographic grating lens can reconstruct the three-dimensional information by conducting multiple optical slicing of an object based on Bragg selectivity of the volume holographic grating. In this paper, we employ the point-spread function of volume holographic imaging system to theoretically analyze its imaging resolution.
Zhu-Qing Jiang, Shi-Quan Tao
exaly   +2 more sources

Does a Fourier holographic lens exist?

SPIE Proceedings, 1991
A quadratic phase holographic lens can perform Fourier transformation on a two-dimensional input, but the transform is multiplied by a detrimental parasitic phase that is caused by the off-axis configuration. Fortunately, with the proper geometry, and for a limited spatial frequency, this parasitic phase can be considered as a constant, so it need ...
R. Blank, Asher A. Friesem
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Holographic projector using one lens

Optics Letters, 2010
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 ...
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The resolution characteristics of volume holographic lens

2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics, 2009
We introduce two kinds of typical volume holographic gratings into the imaging system respectively, and discuss their resolution characteristics in lateral and longitudinal defocus condition to improve the image quality.
Yang Jing, Jiang Zhu-qing, Xu Zhi-qiang, Wan Yu-hong, Tao Shi-quan   +4 more
openaire   +1 more source

Use Of A Holographic Lens For Producing Cylindrical Holographic Stereograms

Optical Engineering, 1981
The production of cylindrical holographic stereograms, or multiplex holograms, requires the use of a large, low f/number cylindrical lens to form a line image on the holographic film. To have an image of reasonable size for display purposes, the f/number of the lens must be quite small, on the order of f/1, and the dimensions of the lens must be ...
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Compact lens-less holographic memory

1997 Optical Data Storage Topical Meeting ODS Conference Digest, 2002
A common problem of many holographic memory systems is that they must occupy relatively large areas in order to accommodate the various imaging optics necessary for system operation. A typical memory system requires an imaging lens system between the input and output devices, such as a spatial light modulator (SLM) and charge-coupled device (CCD).
Drolet, J.J., Barbastathis, G., Psaltis, D., Chuang, E.   +3 more
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Objective Lens for Holographic Worm Drives

International Symposium on Optical Memory and Optical Data Storage, 2005
A generalization of the objective lens for optical disk storages is proposed to accommodate holographic data storage that uses two beams. Feasibility tests by numerical and experimental studies are presented.
Jideog Kim, Y. Eugene. Pak
openaire   +1 more source

Astigmatism free holographic lens elements

Optics Communications, 1977
Abstract By applying the s and t formula for a hologram lens on a curved surface the conditions which must be satisfied for astigmatism free imagery are derived. It is shown that for hologram lenses formed on surfaces which are conic sections or on a plane surface, astigmatism free imagery can be obtained for extended objects.
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Lens Designs for Page-Based Holographic Storage Systems

Optical Data Storage, 2007
An aspherical-meniscus and air-spaced-spherics are identified as minimum aberration configurations for page-based holographic recordings. Air-spaced-apsherics attain imaging NA’s of 0.7 for holographic recording only, and of 0.45 for a combination of holographic and surface recording.
Yuzuru Takashima, Sergei Orlov, Lambertus Hesselink   +2 more
openaire   +1 more source