منابع مشابه
Elliptical beams.
A very general beam solution of the paraxial wave equation in elliptic cylindrical coordinates is presented. We call such a field an elliptic beam (EB). The complex amplitude of the EB is described by either the generalized Ince functions or the Whittaker-Hill functions and is characterized by four parameters that are complex in the most general situation. The propagation through complex ABCD o...
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T he whispering gallery is located in the dome of St Paul’s Cathedral in London. If two people stand on opposite sides of the gallery and one of them whispers into the wall, the other can hear his or her words. The reason for this strange effect is that sound bounces along the wall as a surface wave with low loss, and so can be heard far away. This phenomenon, known as whispering gallery mode (...
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We present a study of the efficiency and optimization of cw second harmonic generation by elliptical Gaussian laser beams. Elliptical focusing slightly improves conversion efficiency and reduces crystal damage risk when heavy walk-off is present. Single-pass measurements of the efficiency for doubling 5 15-nm radiation in beta-barium borate (BBO) agree with theory. Thermal effects, caused by ra...
متن کاملGeneral analysis of type I second-harmonic generation with elliptical Gaussian beams
The optimal focusing arrangement for second-harmonic generation is a compromise between the focal intensity and the depth of focus (confocal parameter) within the crystal. In the absence of birefringence (noncritical phasematching), the fundamental beam should have a circular cross section and a confocal parameter of 0.35 of the crystal’s length.1 Angle-tuned (critical) phase matching causes th...
متن کاملThe Elliptical–Spheroidal and Elliptical–Elliptical Galaxy Dichotomies
This paper summarizes Kormendy et al. (2009, ApJS, in press, arXiv:0810.1681). We confirm that spheroidal galaxies have fundamental plane correlations that are almost perpendicular to those for bulges and ellipticals. Spheroidals are not dwarf ellipticals. They are structurally similar to late-type galaxies. We suggest that they are defunct (“red and dead”) late-type galaxies transformed by a v...
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ژورنال
عنوان ژورنال: Optics Express
سال: 2008
ISSN: 1094-4087
DOI: 10.1364/oe.16.021087