Results 271 to 280 of about 262,408 (319)
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Optics Letters, 2016
We report on the observation of a modulated pattern induced by a single laser beam in a polymeric film. In spite of the simple geometrical configuration, the analysis of the far field diffraction pattern allows a sensitive retrieving of the wavelength of the recording beam and of its incidence angle, pointing out the high information content of the ...
R Castagna +5 more
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We report on the observation of a modulated pattern induced by a single laser beam in a polymeric film. In spite of the simple geometrical configuration, the analysis of the far field diffraction pattern allows a sensitive retrieving of the wavelength of the recording beam and of its incidence angle, pointing out the high information content of the ...
R Castagna +5 more
openaire +3 more sources
Optical Design for Photonics, 1993
New systems are being developed around innovative diffractive optical components. Applications in optical interconnects, signal switching and interferometry have created a need for two-dimensional optical fanout gratings with unusual geometries. The increasingly complex gratings being designed for such optical fanout devices require specialized ...
A. D. Kathman +2 more
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New systems are being developed around innovative diffractive optical components. Applications in optical interconnects, signal switching and interferometry have created a need for two-dimensional optical fanout gratings with unusual geometries. The increasingly complex gratings being designed for such optical fanout devices require specialized ...
A. D. Kathman +2 more
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Structure related beam propagation
Optical and Quantum Electronics, 1999The general theory of a class of structure related (SR) non-orthogonal coordinate systems is introduced for the first time. Special cases of this type of coordinate system used separately or in combination can automatically follow the local geometry of many common optical waveguide designs, thereby facilitating the fast and accurate simulation of ...
T. M. Benson +3 more
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Annalen der Physik, 2023
AbstractThis paper presents a novel approach for generating structured light using a diffractive beam‐shaping element that can generate multiple beams with distinct spatial structures in the focal plane. The element is constructed by restructuring a spiral zone plate with fork gratings, providing a tunable and controllable means for generating ...
Haleh Ebrahimi, Arash Sabatyan
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AbstractThis paper presents a novel approach for generating structured light using a diffractive beam‐shaping element that can generate multiple beams with distinct spatial structures in the focal plane. The element is constructed by restructuring a spiral zone plate with fork gratings, providing a tunable and controllable means for generating ...
Haleh Ebrahimi, Arash Sabatyan
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Structurally Stable Hyperbolic Beam
Japanese Journal of Applied Physics, 2009A technique for generation of a structurally stable hyperbolic beam using Fourier transform holography is reported. Bessel function with their arguments having hyperbolic locus is used for generating a diffractive optical element (DOE). For the introduction of optical vortex a circular vortex term is used.
Rijuparna Chakraborty, Ajay Ghosh
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2021
The presentation of the finite element method starts in this chapter with the explanation of the finite element method for truss and beam systems. The concept of stiffness matrices is shown first for a simple truss element. The procedure for setting up the equations for a finite element analysis is explained exemplary for a simple truss system.
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The presentation of the finite element method starts in this chapter with the explanation of the finite element method for truss and beam systems. The concept of stiffness matrices is shown first for a simple truss element. The procedure for setting up the equations for a finite element analysis is explained exemplary for a simple truss system.
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Photonic crystal structures: Beam deflector and beam router
Chinese Physics B, 2018We investigate the optical characteristic, transverse magnetic (TM) and transverse electric (TE) band of two-dimensional (2D) square lattice photonic crystal structure, which is composed of cylindrical air regions positioned at the corners of the square shaped dielectric rods.
Erdiven U., Tetik E., Karadag F.
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Beam structure studies of low-energy ion beams
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1991Abstract The ion beam structure at various axial positions along the beam-transport line has been monitored and studied utilizing a fluor screen and a video camera. The fluor material is aluminum oxide that is plasma-jet sprayed onto the surface of an aluminum or a water-cooled copper substrate.
K. Saadatmand +3 more
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Equivalent beam analysis of thin-walled beam structures
Computers & Structures, 1987Abstract In the analysis of thin-walled beam structures it is often necessary to consider the effects of warping restraint in addition to the more usual actions of pure torsion, bending moment and axial force. Out-of-plane warping occurs as a result of twisting about the horizontal axis and, if restrained, may result in the development of large ...
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Optics Letters, 2019
We study the beam wander of a class of structured light beams, Hermite-Gaussian correlated Schell-model (HGCSM) beams, in theory and in experiment. It is found that modulating the coherence structure of a structured light beam can reduce the turbulence-induced beam wander, i.e., a HGCSM beam with larger mode orders or lower coherence experiences ...
Jiayi Yu +5 more
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We study the beam wander of a class of structured light beams, Hermite-Gaussian correlated Schell-model (HGCSM) beams, in theory and in experiment. It is found that modulating the coherence structure of a structured light beam can reduce the turbulence-induced beam wander, i.e., a HGCSM beam with larger mode orders or lower coherence experiences ...
Jiayi Yu +5 more
openaire +2 more sources