Results 261 to 270 of about 114,337 (308)

Tolerance analysis on diffraction efficiency and polychromatic integral diffraction efficiency for harmonic diffractive optics

SPIE Proceedings, 2016
In this dissertation, the mathematical model of effect of manufacturing errors including microstructure relative height error and relative width error on diffraction efficiency for the harmonic diffractive optical elements (HDEs) is set up. According to the expression of the phase delay and diffraction efficiency of the HDEs, the expression of ...
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High-diffraction-efficiency pseudorandom encoding

Journal of the Optical Society of America A, 2000
Pseudorandom encoding (PRE) is a statistics-based procedure in which a pure-phase spatial light modulator (SLM) can yield, on the average, the prescribed diffraction pattern specified by the user. We seek to combine PRE with the optimization of an aperture-based target function.
Damla Gurkan, Yongyi Yang, Henry Stark, Christy L. Lawson, Robert W. Cohn   +4 more
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Enhanced diffraction efficiency of gratings in multilayers

Optics Letters, 2000
Computations with the rigorous differential method show that single gratings made by ion implantation have a diffraction efficiency in the +1 transmitted order under TE illumination of only 0.78%. The insertion of such gratings into multilayer dielectric Fabry-Perot cavities leads to an enhancement of the free-space diffraction efficiency.
Francois Flory, Fabien Lemarchand, Laurent Roux, A. During, Ludovic Escoubas   +4 more
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Balancing diffraction efficiency and laser damage in diffractive optics

Optical Modeling and Performance Predictions IX, 2017
Diffractive optics enable applications requiring high power laser focusing and beam shaping. The ability of such components to resist damage is of mounting importance as lasers attain higher power levels. Diffractive optics inherently contain discontinuities that can enhance electric field distributions within the component. Researchers have previously
Steven T. Glass, Thomas J. Suleski
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Diffractive elements of variable optical power and high diffraction efficiency

Applied Optics, 1993
The generation of diffractive elements of variable optical parameters and high diffraction efficiency is presented. It can be realized by a superposition of two conjugate kinoforms. In particular, the method gives rise to zone plates of variable focusing power as well as to circular and linear gratings of variable deflection angles.
Zbigniew Jaroszewicz, Andrzej Kolodziejczyk   +1 more
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Effects of diffraction efficiency on the modulation transfer function of diffractive lenses

Applied Optics, 1992
Diffractive lenses differ from conventional optical elements in that they can produce more than one image because of the presence of more than one diffraction order. These spurious, defocused images serve to lower the contrast of the desired image. We show that a quantity that we define as the integrated efficiency serves as a useful figure of merit to
Dale A. Buralli, George Michael Morris
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Diffraction efficiency evaluation for diamond turning of harmonic diffractive optical elements

Applied Optics, 2020
Single point diamond turning is a commonly used method for manufacturing harmonic diffractive optical elements (HDOEs). Diffraction efficiency of HDOEs is sensitive to surface-relief profile errors, and a half-round tool can reduce the profile error obviously. Furthermore, the diamond tools also create surface roughness errors.
Peng Zhou, Chang Liu, Changxi Xue, Xingguo Liu, Chao Yang   +4 more
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Holograms of high diffraction efficiency

Soviet Journal of Quantum Electronics, 1972
An experimental study was made of the effects of bleaching on holograms. Optimal bleaching conditions made it possible to achieve a high diffraction efficiency (50%) for a hologram which recorded interference of two plane waves. In the case of a hologram of a transparency, it was important to ensure a satisfactory quality of the reconstructed image ...
M A Maiorchuk, V I Bobrinev, V K Kozlova
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High diffraction efficiency, broadband, diffraction crystals for use in crystal diffraction lenses

Experimental Astronomy, 2006
A major goal of the MAX program is to detect and measure gamma rays produced following the nuclear reactions that take place in a supernova explosion. To detect a reasonable number of supernovae, sensitivities of the order of a few times 10-7 γ cm-2sec-1 are needed — much better than possible with current instruments. The approach in the MAX program is
Robert K. Smither, Peter Von Ballmoos, Mark A. Beno, Gerry K. Skinner, Khaliefeh Abu Saleem, Dante Eduardo Roa   +5 more
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<title>Achromatization of the diffraction efficiency of diffractive optical elements</title>

SPIE Proceedings, 1999
Diffractive optical elements (DOEs) are characterized by a large negative dispersion. This property can be exploited to correct chromatic aberration in hybrid optical systems. The diffraction efficiency of phase DOEs decreases when the wavelength deviates from the design wavelength.
Weible, K. J., Schilling, A., Herzig, H. P., Lobb, D.   +3 more
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