Results 211 to 220 of about 27,037 (263)
Some of the next articles are maybe not open access.
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
openaire +1 more source
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
openaire +1 more source
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
openaire +2 more sources
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
openaire +1 more source
Diffraction Losses in Radiometry and Photometry
Metrologia, 1970The precision of radiometry and photometry is reaching a stage, in standardizing laboratories at least, where greater attention should be paid to losses of flux by diffraction. Otherwise errors of up to 0.5% or more may occur. This article reviews from the radiometric point of view diffraction losses at circular apertures, for both the Fraunhofer and ...
openaire +1 more source
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 ...
openaire +1 more source
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
openaire +1 more source
Diffraction Loss and Beam Size in Lasers with Spherical Mirrors
Journal of the Optical Society of America, 1964The diffraction loss and beam size of the TEM00 mode in gas lasers have been determined experimentally. The results are in agreement with theoretically predicted values to within the experimental error, except that the increase in beam size with reduction of mirror size was found to be less than predicted.
Taylor, M. J. +2 more
openaire +2 more sources
Diffraction Losses Associated with Tungsten Lamps in in Absolute Radiometry
Applied Optics, 1975The diffraction losses associated with absolute radiometers were calculated for the case where the source is a tungsten lamp used with a long wavelength suppressing filter. The calculations were done using Blevin's treatment, which assumes a point source and a single diffracting aperture. We have shown that this treatment is sufficiently accurate for a
openaire +2 more sources
Experimental investigation of diffraction losses on radio links
IEEE Antennas and Propagation Society International Symposium 1997. Digest, 2002The requirement for the calculation of microwave link path loss has received considerable attention over time and a number of path loss prediction algorithms have been created. Many of these however are based on theoretical calculations using idealized obstacles so that the actual measured path loss will deviate significantly from calculated values ...
R.G. Mazzolin, J.S. Dahele
openaire +1 more source
Simple expressions for diffraction loss in open resonators
Microwave and Optical Technology Letters, 1992AbstractIn this article simple closed‐form are presented expressions to compute the diffraction loss of open resonators composed of spherical mirrors of circular cross‐section. These expressions, which are based on the numerical results of scalar theory, should be useful in designing mirror size for open resonators.
R. K. Arora, R. K. Mongia
openaire +1 more source