172,181 research outputs found
Pseudo-Schell model sources
No full textPartially coherent pseudo-Schell model sources are introduced and analyzed. They present radial symmetry and coherence characteristics depending on the difference between the radial distances of two points from the source center. As a consequence, all points belonging to circles centered on the symmetry center of the source are perfectly correlated. We show that such sources radiate fields with peculiar behaviors in paraxial propagation. In particular, when compared to beams produced by Gaussian Schell-model sources with comparable coherence parameters, the irradiance can present sharper profiles and higher peak values and a better beam quality parameter. Furthermore, when a pseudo-Schell model source presents a vortex, the propagated beam preserves a null of the intensity along its axis
Hamilton K. Redway Family papers, 1825-1916
No full textLetter from Assistant surgeon H.S. Schell to Capt. T.C. Kendall requesting the descriptive list of Private Mauz. V.V. Washburn. A descriptive list is a soldier's record which documents his medical history, physical description, as well as clothing accounts and deposits. In this case, Schell would be requesting his medical history, but would receive an all-encompassing descriptive list of Private Washburn. Schell states that two application requests have been made for this soldier's descriptive list: one on October 24, 1864 and the other on January 24, 1865. He notes that the Cuyler Hospital has yet to receive the requested descriptive list
Realizability condition for electromagnetic Schell-model sources
No full textThe set of functions that appear in the correlation matrix of an electromagnetic source must satisfy the constraint of nonnegative definiteness. Here we derive a necessary and sufficient condition for nonnegativeness for the class of electromagnetic Schell-model sources. This result also suggests a possible synthesis procedure for this type of source. As an illustration, two specific examples of electromagnetic Schell-model sources are discussed. (C) 2008 Optical Society of America
Marriage record of Schell, C. E. and Doyle, Maggie
No full textMarriage license for C.E. Schell and Maggie Doyle. T. Bernard was the officiant
Synthesis of electromagnetic Schell-model sources
No full textA procedure for the synthesis of the most general electromagnetic Schell-model light source is proposed. It makes use of the generalized van Cittert-Zernike theorem to produce the electromagnetic source starting from a primary spatially incoherent source, characterized by a suitable position-dependent polarization matrix. By resorting to the spectral decomposition of the polarization matrix, it is shown how such an incoherent source can be synthesized by using a Mach-Zehnder interferometer, with suitable amplitude transmittances placed in its arms, fed by two mutually uncorrelated laser beams. Examples are given for the case of electromagnetic Gaussian Schell-model sources. (C) 2009 Optical Society of Americ
Aktuelle Herausforderungen für die Naturschutzpolitik aus politikwissenschaftlicher Sicht
No full textAktuelle Herausforderungen für die Naturschutzpolitik aus politikwissenschaftlicher Sicht
No full textSynthesis of electromagnetic Schell-model sources
No full textA procedure for the synthesis of the most general electromagnetic Schell-model light source is proposed. It makes use of the generalized van Cittert-Zernike theorem to produce the electromagnetic sourcestarting from a primary spatially incoherent source, characterized by asuitable position-dependent polarization matrix. By resorting to the spectral decomposition of the polarization matrix, it is shown how such an incoherent source can be synthesized by using a Mach-Zehnderinterferometer, with suitable amplitude transmittances placed in its arms, fed by two mutually uncorrelated laser beams. Examples are givenfor the case of electromagnetic Gaussian Schell-model sources. (C) 2009 Optical Society of Americ
Modal analysis of pseudo-schell model sources
No full textAll pseudo-Schell model sources have been shown to possess the same continuous set of circularly symmetric modes, all of them presenting a conical wavefront. For keeping energy at a finite level, the mode amplitude along the radial coordinate is modulated by a decreasing exponential function. A peculiar property of such modes is that they exist in the Laplace transform’s realm. After a brief discussion of the near-zone, we pass to the far-zone, where the field can be evaluated in closed form. The corresponding features of the intensity distribution are discussed
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