Results 161 to 170 of about 32,600 (191)

Hyperspectral holography and volume Denisyuk holograms

Holography: Advances and Modern Trends VI, 2019
Registration of two types of digital holograms is considered: digital hyperspectral holograms and Denisyuk volume holograms (holograms in colliding beams). Hyperspectral holograms are considered as an analogue of thin holograms, in which zero order and a conjugate image are suppressed.
Sergey Kalenkov, Georgy S. Kalenkov
openaire   +1 more source

Technique for controlling cross-talk noise in volume holography

Optics Letters, 1996
We study cross-talk noise in holographic memory and estimate storage limits. We examine the effects of reduced angular density and the use of an apodized reconstruction beam on capacity, cross-talk noise, and diffraction efficiency. Experimental Bragg-selectivity curves with and without an apodized reconstruction beam verify the expected reduction in ...
M A, Neifeld, M, McDonald
openaire   +2 more sources

1550-nm volume holography for optical communication devices

IEEE Photonics Technology Letters, 2000
The two-lambda method can provide a strategic approach to implement all-optical devices for communication wavelength division multiplexing (WDM) signal processing based on volume holography. By writing holograms at 488 nm in LiNbO/sub 3/:Fe and reading them in the third window of optical communication systems (1550 nm), the feasibility of WDM ...
BOFFI, PIERPAOLO, UBALDI M. C, PICCININ D, FRASCOLLA C, MARTINELLI, MARIO   +4 more
openaire   +2 more sources

APPLICATIONS OF PHOTOREFRACTIVE VOLUME HOLOGRAPHY IN OPTICAL COMPUTING

Journal of Nonlinear Optical Physics & Materials, 1994
After a brief review of the photorefractive effect, we describe three examples of the applications in optical computing using photorefractive volume holography. These are 3-dimensional optical storage, parallel optical matrix processor, and multiwavelength optical half-adder.
C. GU, P. YEH
openaire   +1 more source

Gold nanosphere doped photopolymer for volume holography

SPIE Proceedings, 2014
We propose a novel gold nanosphere doped photopolymer for volume holography. Nanospheres with the diameter of 6-8 nm are evenly dispersed inside a thick photopolymer with thermo-polymerization method. The holographic properties can be greatly enhanced during the two-beam holographic exposure with the doping of the gold nanospheres.
Liangcai Cao, Chengmingyue Li, Zheng Wang, Xiaoxin Li, Guofan Jin, Yuan Luo   +5 more
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Borrmann-like anomalous effects in volume holography

Applied Physics, 1980
In this review, a surgey of the evidence for the appearance in volume holography of certain anomalous effects (akin to the Borrmann effect in x-ray crystallography) is conducted, with reference to both experimental observations and theoretical models.
P. St. J. Russell, L. Solymar
openaire   +1 more source

Volume holography with Bessel-like reference beams

SPIE Proceedings, 2015
We report volume holographic recording and reconstruction of plane waves using Bessel-like reference beams. A photorefractive lithium niobate crystal (0.05% Fe:LiNbO3) is employed as the holographic medium in a two-wave mixing set-up. The reconstructed plane wave has the same appearance as a Bessel beam, displaying a central maximum and concentric ...
Raphael A. Guerrero, Jonathan P. Manigo
openaire   +1 more source

A technique for control of crosstalk noise in volume holography

Holography, 1996
Volume holographic data storage offers many potential advantages over conventional magnetic mass storage including high parallelism, fast access, and high storage capacity. The high capacity of volume holography is partially attributable to the Bragg selectivity of thick media. For angularly multiplexed uniform gratings in media of finite thickness the
Mark McDonald, Mark A. Neifeld
openaire   +1 more source

Holography, magnetic fields and thermodynamic volumes

2015
This dissertation explores the application of gauge/gravity duality to gauge theories of interest in condensed matter physics, as well as thermodynamic volumes. ? Four?dimensional gravity with a U(1) gauge field, coupled to various fields in asymptotically anti?de Sitter spacetime, provides a rich arena for the holographic study of the strongly coupled
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Multiple Exposure Holography In Volume Materials.

1976
PhD ; Optics ; University of Michigan, Horace H. Rackham School of Graduate Studies ; http://deepblue.lib.umich.edu/bitstream/2027.42/180714/2/7627461 ...
openaire   +2 more sources