Results 221 to 230 of about 133,733 (246)

Diffraction grating with rectangular grooves exceeding 80% diffraction efficiency

Infrared Physics, 1993
Abstract 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, P. Kipfer, J.T. Sheridan, J. Schwider, N. Streibl, M. Collischon, J. Hutfless, M. März   +7 more
openaire   +1 more source

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
openaire   +1 more source

Diffraction Efficiency of High-NA Continuous-Relief Diffractive Lenses

Diffractive Optics and Micro-Optics, 1996
Diffractive 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, C.G. Blough, D.H. Raguin, E.K. Popov, D. Maystre   +4 more
openaire   +1 more source

Diffraction efficiency of magnetic hologram

IEEE Transactions on Magnetics, 1972
MnBi thin films have been studied as a magneto-optical memory element. Ordinarily, restricted conditions are required for preparing pure MnBi film with excellent properties and homogeneity. However, in the case of Mn-Bi-Te films, it was found that adopting the proper composition made it easy to prepare homogeneous films, and the figure of merit F/α was
M. Tanaka, T. Ito, Y. Nishimura
openaire   +1 more source

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, Changxi, Xue, Chao, Yang, Chang, Liu, Xingguo, Liu   +4 more
openaire   +2 more sources

HETG high-order diffraction efficiency

SPIE Proceedings, 1998
Measurements at XRCF produced calibration data of the high orders of the AXAF High Energy Transmission Gratings at several energies. These tests provide a necessary complement to the limited set of laboratory high-order measurements on each of the flight gratings.
Kathryn A. Flanagan, Norbert S. Schulz, Stephen S. Murray, Gisela D. Hartner, Peter Predehl   +4 more
openaire   +1 more source

High-efficiency switchable diffractive lens

SPIE Proceedings, 2006
We demonstrate that, by using circular array of electrode pattern and applying multi-level phase modulation in each zone, a high-efficiency switchable electro-optic diffractive lens using liquid crystal as the active medium can be produced as a switchable eyewear. The lens is flat and the thickness of the liquid crystal is 5 μm.
Guoqiang Li, P. Valley, P. Ayräs, J. Haddock, M. S. Giridhar, D. Mathine, J. Schwiegerling, G. Meredith, Bernard Kippelen, Seppo Honkanen, N. Peyghambarian   +10 more
openaire   +1 more source

Approximate diffraction theories: efficient modeling of diffractive optical elements

Diffractive Optics and Micro-Optics, 2002
A new formulation of the generalized Kirchhoff approximation is presented which provides improved accuracy and a higher flexibility to model surface relief structures. The predicted diffraction amplitude is compared with rigorous coupled wave theory.
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Upper bound of the diffraction efficiency of diffractive phase elements

Optics Letters, 1991
An upper bound of the diffraction efficiency of diffractive elements that only influence the phase of the illumination wave is derived. The derivation only utilizes the specification of the desired diffraction pattern. It is independent of the technique to design and fabricate the diffractive element.
openaire   +2 more sources

Design of multilayer diffractive optical elements with polychromatic integral diffraction efficiency

Optics Letters, 2010
What we believe to be a new method for designing multilayer diffractive optical elements (MLDOEs) for wideband with consideration of polychromatic integral diffraction efficiency (PIDE) is presented. The benefit of this method is that the maximum PIDE over the entire waveband for MLDOEs can be obtained.
Changxi, Xue, Qingfeng, Cui
openaire   +2 more sources