Results 201 to 210 of about 887,904 (256)

Multilcolor Wavefront Reconstruction

Applied Optics, 1967
Two and three primary colors derived from an He-Ne gas laser and an argon gas laser were employed in recording and reconstructing holograms. For the tricolor case it is possible to reconstruct a three-dimensional multicolor image which possesses almost all the natural hues of the original object.
A A, Friesem, R J, Fedorowicz
openaire   +2 more sources

Microscopy by Wavefront Reconstruction

Journal of the Optical Society of America, 1965
Magnification by the wavefront-reconstruction imaging method is discussed. An analysis is given of the aberrations which arise in this type of imagery. Conditions are derived which lead to aberration-free reconstructions.
Emmett N. Leith, Juris Upatnieks
openaire   +2 more sources

Wavefront reconstruction photography

Physics Today, 1965
Wavefront reconstruction, or holography, is a fascinating photographic process which is a major departure from conventional photography. In this process, discovered in 1947 by D. Gabor of Imperial College, London, the photosensitive device does not directly record an image of the subject; instead, the electromagnetic waves reflected or scattered from ...
Emmett Leith, Juris Upatnieks
openaire   +1 more source

Holography—the reconstruction of wavefronts

Electronics and Power, 1966
This account, by a pioneer in the field, of the principles and development of holography raises the questions of how are we to profit from holographic techniques, and what are we to learn from the mathematical principles embodied therein?
openaire   +1 more source

Iterative Wavefront Reconstruction for Astronomical Imaging

SIAM Journal on Scientific Computing, 2013
Obtaining high resolution images of space objects from ground based telescopes is challenging, and often requires computational postprocessing methods to remove blur caused by atmospheric turbulence. In order for an image deblurring (deconvolution) algorithm to be effective, it is important to have a good approximation of the blurring operator.
Qing Chu, Stuart Jefferies, James G. Nagy   +2 more
openaire   +1 more source

Wavefront reconstruction for the Shack-Hartmann wavefront sensor

SPIE Proceedings, 2002
The Shack-Hartmann wavefront sensor is a powerful tool for optical analysis. A vital step in the data analysis chain involves reconstructing the wavefront incident upon the lenslet array from hundreds or thousands of slope measurements. We discuss here the basics of reconstruction and the differences in reconstruction for the case of Hartmann and Shack-
openaire   +1 more source

Acousto-optic wavefront sensing and reconstruction

Applied Optics, 2008
We employ an acousto-optic cell as a tunable-pitch wavefront sensor and study its performance. The index of refraction of two cross-standing waves forms, in the near field, an adjustable array of caustics. These caustics, similar to the lenslets used for Hartmann-Shack sensing, were measured to have an extended focal relief of 200 times their pitch. We
Adir, Stup, Eyal M, Cimet, Erez N, Ribak, Vassilios, Albanis   +3 more
openaire   +2 more sources

Incoherent wavefront reconstruction by a retroemission device

Optics Letters, 2015
This Letter addresses wavefront reconstruction by a retroemission device (REM). REM represents a lenslet array mounted on a substrate made of photoluminescent optical material, such as a polymer film impregnated with upconversion nanoparticles. An excitation light wavefront incident on the REM was sampled by the lenslet array piece-wise.
Eugenyi V, Khaydukov, Vladimir A, Semchishen, Andrei V, Zvyagin   +2 more
openaire   +2 more sources

Wavefront reconstruction from its gradients

Journal of the Optical Society of America A, 2006
Wavefronts reconstructed from measured gradients are composed of a straightforward integration of the measured data, plus a correction term that disappears when there are no measurement errors. For regions of any shape, this term is a solution of Poisson's equation with Dirichlet conditions (V = 0 on the boundaries).
Amos, Talmi, Erez N, Ribak
openaire   +2 more sources

Wavefront reconstruction using smartphone based wavefront sensors

SPIE Proceedings, 2015
Smartphone camera system has the capability of being integrated into powerful field-sensing tools, capturing data and sharing these data with computing servers or cloud experts. The purpose of this work is to implement a wavefront sensor based on the smartphone platform, which has many potential applications in thin-films and bio-related sensing areas.
Zhenyu Yang, Qiwen Zhan
openaire   +1 more source