Results 1 to 10 of about 6,788 (257)
Simulation of Fresnel Zone Plate Imaging Performance with Number of Zones [PDF]
Sensors, 2020 In recent years, integral imaging, a promising three-dimensional imaging technology, has attracted more and more attention for its broad applications in robotics, computational vision, and medical diagnostics. In the visible spectrum, an integral imaging
Ying Li +2 more
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Propagation of an Airy-Gaussian beam passing through a lens with low effective Fresnel number
Results in Physics, 2020 We derive an analytical propagation expression for the Airy-Gaussian beam propagating through a thin lens, and calculate numerical examples to investigate its focusing properties.
Jie Zhu, Huiqin Tang, Qilin Gao
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Multimode Resonators with a Small Fresnel Number (Lowest-Order Eigenmodes) [PDF]
Zeitschrift für Naturforschung A, 1965 The Fabry-Pèrot Interferometer, the confocal and the spherical resonator systems are investigated. The lowest-order traveling-wave type eigenmodes are calculated. Numerical values for the diffraction losses are given. The smallest diffraction losses are obtained for the general-type eigenmode of a confocal resonator system.
H. K. V. Lotsch
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Excess noise in low Fresnel number unstable resonators [PDF]
Optics Communications, 1999 Numerical calculations of excess noise factors in low Fresnel number unstable resonators are described in detail. Computed mode profiles in one transverse dimension together with associated Petermann K-factors are presented; dynamical considerations such as injected wave excitation are also examined.
G.S. McDonald, G.H.C. New, J.P. Woerdman
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Design considerations for low-light level low-Fresnel number optical systems
Applied Optics, 2009 Low-Fresnel number optical systems exhibit significant diffraction effects that cause a shift in the peaks of on-axis irradiance away from the geometric focal point. This is currently interpreted as a change of the focal length of an optical system, leading optical system designers to compensate for the effect by assuming the image plane is coincident ...
Christoph Baranec
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Numerical Fresnel models of Fresnel zone plates for plane wave at angle of incidence [PDF]
Scientific ReportsDiffractive optical elements (DOEs) are increasingly used in electro-optical systems due to their design flexibility, which offers advantages over refractive optics.
Ahmet Ünal
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Elliptical-Shaped Fresnel Lens Design through Gaussian Source Distribution
Energies, 2022 A novel three-dimensional elliptical-shaped Fresnel lens (ESFL) analytical model is presented to evaluate and maximize the solar energy concentration of Fresnel-lens-based solar concentrators.
Dário Garcia +6 more
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Refined beam expansion method for unstable resonator modes
Results in Optics, 2023 A refined and simplified version of the beam expansion method for computing the modes of unstable resonators is presented here.The principle of the beam expansion method is to express the field pattern on a basis of Hermite-Gaussian functions ...
Z. Derrar Kaddour, G.H.C. New
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Energies, 2023 Concentrating photovoltaic thermal (CPVT) solar collectors can be regarded as a promising technology, as they are capable of providing renewable electricity and industrial heat simultaneously. The development of a novel CPVT receiver for a linear Fresnel
Alois Resch, Robert Höller
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Off-axis Fresnel numbers in laser systems [PDF]
High Power Laser Science and Engineering, 2014 Abstract The physical meaning and essence of Fresnel numbers are discussed, and two definitions of these numbers for off-axis optical systems are proposed. The universal Fresnel number is found to be $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq ...
Yudong Yao +4 more
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