Results 291 to 300 of about 390,346 (343)
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Optics Letters, 2000
The theoretical diffraction efficiency upper limit of diffractive phase elements (DPE's) with finite apertures is investigated. A successful numerical method of evaluating the efficiency upper bound of DPE's is proposed. The method includes a hybrid optimization procedure that combines a genetic algorithm with the conjugate gradient method.
G, Zhou +4 more
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The theoretical diffraction efficiency upper limit of diffractive phase elements (DPE's) with finite apertures is investigated. A successful numerical method of evaluating the efficiency upper bound of DPE's is proposed. The method includes a hybrid optimization procedure that combines a genetic algorithm with the conjugate gradient method.
G, Zhou +4 more
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Modeling diffraction efficiency effects when designing hybrid diffractive lens systems
Applied Optics, 1992We investigated the design of two broadband hybrid diffractive-refractive optical systems, a landscape lens, and a Schmidt telescope. The systems were achromatized by using the characteristically large negative dispersion of kinoforms. In the scalar wave regime kinoforms can approach 100% efficiency but only for one object point and wavelength.
C, Londoño, P P, Clark
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Diffractive elements of variable optical power and high diffraction efficiency
Applied Optics, 1993The 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.
A, Kolodziejczyk, Z, Jaroszewicz
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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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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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Performance of diffractive lenses with nonunity diffraction efficiency
Optical Society of America Annual Meeting, 1990The unique optical properties of diffractive optical elements make them attractive candidates for a wide variety of applications. Unlike conventional optical elements, however, diffractive optics can simultaneously produce more than one image, resulting from the various diffracted orders.
Dale A. Buralli, G. Michael Morris
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High diffraction efficiency, broadband, diffraction crystals for use in crystal diffraction lenses
Experimental Astronomy, 2006A 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 +5 more
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Diffraction efficiency of nonsynchronously sampled diffraction gratings
Optical Engineering, 2002This PDF contains the communication "Diffraction efficiency of nonsynchronously sampled diffraction gratings."
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Diffraction grating with rectangular grooves exceeding 80% diffraction efficiency
Infrared Physics, 1993Abstract A novel design for a surface relief grating with rectangular grooves is presented. The first reflected diffraction order shows experimentally 84% diffraction efficiency for a metallic grating. The required binary surface relief can be manufactured by using one single microlithographic fabrication step similar to standard processes in ...
H. Haidner +7 more
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Balancing diffraction efficiency and laser damage in diffractive optics
Optical Modeling and Performance Predictions IX, 2017Diffractive 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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Diffraction Efficiency of High-NA Continuous-Relief Diffractive Lenses
Diffractive Optics and Micro-Optics, 1996Diffractive lenses are key elements in a large variety of optical systems. In hybrid refractive/diffractive optical systems they are used as powerful elements for aberration correction. Other applications, such as fiber coupling and optoelectronic devices, benefit from the fact that diffractive structures are thin and lightweight, enabling very compact
M. Rossi +4 more
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