Results 211 to 220 of about 24,731 (260)
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Diffraction loss in radiometry
Applied Optics, 2003Diffraction loss in radiometry has gained in importance recently because of an increased interest in longer wavelengths and the continuous improvement in experimental accuracy. The deviation from geometrical optics now contributes significantly to the errors of experiments.
Philip, Edwards, Martin, McCall
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IEEE Transactions on Magnetics, 1987
The present paper reports theoretical computations of the diffraction loss incurred by magnetostatic forward volume waves (MSFVW's) with propagation in a YIG film as a result of the finite length of the radiating transducer. As in the case of magnetostatic surface waves (MSSW's), this loss is found to decrease with increasing frequency, a feature that ...
H. Tuan, J. Parekh
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The present paper reports theoretical computations of the diffraction loss incurred by magnetostatic forward volume waves (MSFVW's) with propagation in a YIG film as a result of the finite length of the radiating transducer. As in the case of magnetostatic surface waves (MSSW's), this loss is found to decrease with increasing frequency, a feature that ...
H. Tuan, J. Parekh
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Low-Loss Open Resonators and Diffraction Formulas
Applied Optics, 1972Si descrive una procedura basata su un "nucleo iterato n-volte" per valutare numericamente modi e perdite di risonatori aperti con perdite dell'odine di un millesimo o inferiori. Si è applicata la procedura a un risonatore flat-roof con numero di Fresnel N=12.25 e trovato un grande vantaggio nel tempo di elaborazione per esempio con un nucleo iterato ...
A. Consortini, F. Pasqualetti
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IEE Proceedings - Optoelectronics, 1995
Mode matching in the Fourier spectral domain is used to obtain an expression for the reflectivity between the active cavity and the Bragg mirror of a mesa-geometry VCSEL. The variation of incident mode reflectivity with various parameters is discussed.
R.R. Burton +3 more
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Mode matching in the Fourier spectral domain is used to obtain an expression for the reflectivity between the active cavity and the Bragg mirror of a mesa-geometry VCSEL. The variation of incident mode reflectivity with various parameters is discussed.
R.R. Burton +3 more
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On the Diffraction Loss of Optical Resonator
Japanese Journal of Applied Physics, 1966The oscillation characteristics are reported of a helium-neon laser equipped with a resonator which consists of two concave spherical reflectors with non-identical curvatures. Laser oscillations in resonator arrangements of the so-called high loss geometry are studied. The powers and the field patterns of the output beam are shown.
Ryuichi Hioki, Takeomi Suzuki
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Negative diffraction by a periodically modulated loss
2013 15th International Conference on Transparent Optical Networks (ICTON), 2013We show how a periodic modulation of loss on the wavelength scale provides negative diffraction propagation. In particular, we consider a 2D square arrangement of lossy cylinders embedded in air, with no index contrast. The phase-shifts accumulated in propagation trough such a structure, with flat-flat interfaces, are then compensated by normal ...
Botey Cumella, Muriel +5 more
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Diffraction loss of confined modes in microcavities
1997 Digest of the IEEE/LEOS Summer Topical Meeting: Vertical-Cavity Lasers/Technologies for a Global Information Infrastructure/WDM Components Technology/Advanced Semiconductor Lasers and Applications/Gallium Nitride Materials, Processing, and Devices (C, 2002In this paper, the loss of a simplified cavity is studied using an accurate numerical model that solves the scalar Helmholtz Equation at each point in the cavity. The idealized cavity geometry consists of two perfect mirrors. The upper mirror is offset inward at some radius as shown, so that the cavity is laterally index guided.
G.R. Hadley, K.L. Lear
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Diffractional losses in corner reflectors
Proceedings of LFNM 2005. 7th International Conference on Laser and Fiber-Optical Networks Modeling, 2005., 2005We present the analysis of fundamental losses of optical power in dielectrical corner reflectors, which are now planned to replace spherical mirrors in the next generation of large-scale Earth-based gravitational wave detectors. The mechanism of losses is diffractional scattering of light beam used in Fabry-Perot resonator on the edge of corner ...
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Measurements of 28 GHz diffraction loss by building corners
Ninth IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (Cat. No.98TH8361), 2002This paper presents the results of a recent 28 GHz continuous-wave (CW) building corner diffraction measurement campaign in the Washington, DC area. Observed diffraction losses showed little dependence on polarization and building material. For diffraction angles greater than 5/spl deg/, a simple linear equation accurately describes the diffraction ...
Peter A. Tenerelli, Charles W. Bostian
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