Results 81 to 90 of about 378,095 (341)

Diffractive efficiency improvement of diffractive cylinder lenses by Gaussian-beam illumination

Optics Express, 1997
To maximize the diffraction efficiency of cylinder lenses with high numerical apertures (such as F/0.5 lenses) we use an iterative algorithm to determine the optimum field distribution in the lens plane. The algorithm simulates the free-space propagation between the lens and the focal plane applying the angular spectrum of plane waves. We show that the
Martin Schmidt, Felix Fuerer, Olof Bryngdahl   +2 more
openaire   +3 more sources

Laboratory‐Scale Procedure for Evaluating the Flux Efficiency on Melt Cleanliness and Tensile Properties of Recycled Aluminum Alloys

Advanced Engineering Materials, EarlyView.
A laboratory‐scale procedure is developed to evaluate the efficiency of melt‐cleaning and drossing fluxes during aluminium alloy recycling, studying their effects on melt cleanliness and tensile properties of secondary foundry alloys. This work provides a practical tool for foundries and aluminium refiners to assess the efficiency of salt fluxes in ...
Veronica Milani, Giulio Timelli
wiley   +1 more source

Rigorous analysis of extremely asymmetrical scattering of electromagnetic waves in slanted periodic gratings [PDF]

, 2001
Extremely asymmetrical scattering (EAS) is a new type of Bragg scattering in thick, slanted, periodic gratings. It is realised when the scattered wave propagates parallel to the front boundary of the grating.
Akhmanov, Bakhturin, Bedynska, Bedynska, Chateau, Chu, D.K. Gramotnev, Emel’yanov, Gaylord, Glytsis, Gramotnev, Gramotnev, Gramotnev, Gramotnev, Gramotnev, Gramotnev, Gramotnev, Hall, Jarem, Kishino, Kishino, Kogelnik, Li, Liu, Moharam, Moharam, Moharam, Popov, Popov, Seminogov, Stegeman, T.A. Nieminen, Weller-Brophy   +32 more
core   +3 more sources

Impact of Various Rotary Friction Welding Process Parameters on the Mechanical Properties of a Steel–Aluminum Joint

Advanced Engineering Materials, EarlyView.
Rotary friction welding of steel E355 and the aluminum alloy EN AW‐6082 can lead to the formation of brittle intermetallic phases. The primary process parameters are varied in order to determine their influence on this intermetallic phase formation and the resulting mechanical properties.
Laura Huber, Phillipp Schultheiß, Michael Thiele, Christoph Rößler, Heinz Werner Höppel   +4 more
wiley   +1 more source

Atom-optics hologram in the time domain

, 2000
The temporal evolution of an atomic wave packet interacting with object and reference electromagnetic waves is investigated beyond the weak perturbation of the initial state.
A. Aspect, A. V. Soroko, A.M. Guzman, A.P. Kazantsev, A.V. Soroko, A.V. Soroko, B.J. Dalton, C.C. Bradley, D. Gabor, D. Gabor, E.A. Korsunsky, G. Lenz, G. Timp, G.M. Moy, H. Kogelnik, H.J. Lee, H.M. Wiseman, J. Lawall, J.J. McClelland, K. Moler, K.B. Davis, M. Anderson, M. Arndt, M. Holland, M. Kasevich, M. Lewenstein, M. Moringa, M.-O. Mewes, M.K. Oberthaler, M.K. Olsen, N. Davidson, N. Friedman, O. Zobay, P.E. Moskowitz, P.J. Martin, P.P. Ewald, R. Gupta, R.J.C. Spreeuw, V.G. Sidorovich, V.I. Balykin, V.I. Balykin, W. Zhang, Y. Castin   +42 more
core   +1 more source

Liquid crystal spatial light modulator with optimized phase modulation ranges to display multiorder diffractive elements [PDF]

, 2019
Postprint (published ...
Millán Garcia-Varela, M. Sagrario, Pérez Cabré, Elisabet   +1 more
core   +2 more sources

Fatigue Performance of Additively Manufactured Ti‐6Al‐4V: Impact of Different Kinds of Porosities, Surface, and Heat Treatments in Laser Powder Bed Fusion Productivity Parameters

Advanced Engineering Materials, EarlyView.
Ti‐6Al‐4V samples produced by laser‐powder bed fusion are tested for static and dynamic mechanical properties to systematically evaluate the effects of surface roughness and internal porosity when using productivity parameters. The most detrimental impact to fatigue is caused by surface roughness, lack of fusion and keyhole porosity in descending order.
Julian Emanuel Gunther Schulz, Edson Costa Santos, Enrico Bruder, Shannon Bollin, Karsten Durst   +4 more
wiley   +1 more source

Electrical fixing of photorefractive holograms in Sr0.75Ba0.25Nb2O6 [PDF]

, 1993
Photorefractive holograms stored in Sr0.75Ba0.25Nb2O6 crystals are electrically fixed at room temperature. The fixed holograms can be read out directly or after a positive-voltage pulse is applied that can dramatically enhance the diffraction efficiency.
Neurgaonkar, Ratnakar R., Orlov, Sergei, Psaltis, Demetri, Qiao, Yong   +3 more
core  

Microstructural Evolution and Mechanical Properties of a Medium‐Manganese Steel Manufactured by Laser‐Based Powder Bed Fusion of Metals

Advanced Engineering Materials, EarlyView.
Fe–12Mn–0.2C medium‐manganese steel is processed by laser‐based powder bed fusion of metals using blended as well as pre‐alloyed powder. Various scanning speeds are used to determine the influence of energy deposition rate on microstructure and mechanical properties.
Leoni Hübner, Bugra Köksal, Thomas Wegener, Christian Haase, Thomas Niendorf   +4 more
wiley   +1 more source

Multipass holographic interferometer improves image resolution [PDF]

, 1970
Multipass holographic interferometer forms a hologram of high diffraction efficiency, and hence provides a bright and high contrast interferogram. It is used to study any effect which changes the index of refraction and to study surface deformations of a
Brooks, R. E., Heflinger, L. O.
core   +1 more source