Results 211 to 220 of about 26,334 (245)

Curved holographic elements for optical coordinate transformations

Optics Letters, 1991
A new method for performing optical coordinate transformation is presented. It is based on a curved holographic element on which the interference pattern of two perpendicular plane waves is recorded. The design procedures and results for two curved elements that perform a one-dimensional logarithmic coordinate transformation and a Gaussian-to-uniform ...
N, Davidson, A A, Friesem, E, Hasman, I, Shariv   +3 more
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Optical Interconnects with Reflection Holographic Optical Elements

Topical Meeting on Holography, 1986
The increasing demands on micrelectronic circuits for small size and high data rates has pushed electronic interconnection technology to its limit. New techniques are being sought to circumvent these difficulties. Among them are optical interconnections.
R.K. Kostuk, J. W. Goodman, L. Hesselink
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Achromatic optical interconnects using holographic optical elements

1994 Conference on Lasers and Electro-Optics Europe, 1994
Diffractive optical elements as deflectors for optical free-space interconnects have been proposed by several authors.1,2 Unfortunately, the high flexibility of such elements is in many cases outweighed by the strong chromatic aberrations. Surface relief gratings have commonly a rather low carrier frequency (due to the limited resolution of the ...
J. Schwider, R. Volkel, S. Junger
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Phase holographic optical elements and geometrical optics

Journal of the Optical Society of America A, 1997
In the framework of geometrical optics, we show that the general ray-tracing formula for finding the direction of the diffracted rays for thin phase holographic optical elements located on any arbitrary continuous surface can be derived in a form similar to Fermat's principle.
P. J. Twardowski, J. Harthong
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Holographic optical elements recorded in silver halide sensitized gelatin emulsions Part I Transmission holographic optical elements

Applied Optics, 2001
Silver halide sensitized gelatin (SHSG) holograms are similar to holograms recorded in dichromated gelatin (DCG), the main recording material for holographic optical elements (HOE's). The drawback of DCG is its low sensitivity and limited spectral response.
J M, Kim, B S, Choi, S I, Kim, J M, Kim, H I, Bjelkhagen, N J, Phillips   +5 more
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Designing and constructing thick holographic optical elements

Applied Optics, 1978
Previously, holographic optical elements have been constructed with two spherical waves. Better image quality and efficiency can be achieved by constructing thick HOE's with spherically aberrated wavefronts. We include an exact lens equivalent for a HOE to allow computer optimization of such systems. The effect of changes in the index of refraction and
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Optical System Design Using Holographic Optical Elements

SPIE Proceedings, 1985
Holographic Optical Elements (HOEs) are being currently used in an increasing number of applications as components of optical systems, although their use is still relatively rare. HOEs are invaluable for selected optical system applications, inappropriate for most, and potentially useful for others.
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Holographic Optical Element Materials Research.

1978
Abstract : An experimental program was conducted to study and improve the achievable holographic index modulation in dichromated gelatin suitable for producing high-quality holographic optical elements. Emphasis was placed on gaining a working knowledge of the chemical and physical processes involved in dichromated gelatin image production. The largest
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Holographic Optical Elements

2022
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Identification of non-coding silencer elements and their regulation of gene expression

Nature Reviews Molecular Cell Biology, 2022
Baoxu Pang, Leonie Hamoen, Michael Paul Snyder   +2 more
exaly