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SUMMARY:Geometrical Optics Reloaded
DTSTART:20150206T140000
DTSTAMP:20260408T052300Z
UID:a4b04444bea97061cd697446f2870951bfe6fc36ef83359d7ad28fb6
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Frank Wyrowski\, University of Jena\, Germany\nOrganised
  by Optics and Photonics Technology Lab\, Microcity\nGeometrical and wave 
 optics are commonly considered as opposite poles in optical modeling. In r
 ay tracing\, geometrical optics is used to propagate rays through systems 
 and in wave optics\, complex amplitudes are propagated by diffraction inte
 grals and other techniques. Historically the light representation by rays 
 versus complex amplitudes is closely connected to the use of geometrical o
 ptics versus diffraction integrals for light propagation. Often it is conc
 luded\, that geometrical optics does not include phenomena like diffractio
 n\, interference\, coherence\, and polarization. The quite popular distinc
 tion between scalar and electromagnetic waves does not make the situation 
 more comprehensible. \nWe like to discuss geometrical optics from a more 
 general point of view\, which in fact was already suggested by Born and Wo
 lf in 1959 in their classic book Principles of Optics. We follow them and 
 understand geometrical optics as an approximate solution of Maxwell’s eq
 uations that is often very accurate in practice. By this application of ge
 ometrical optics to electromagnetic fields instead of rays\, it becomes ob
 vious\, that geometrical optics can model interference\, partial coherence
  and polarization effects to a large extent\, but excludes diffraction eff
 ects. Thereby\, we understand diffraction effects in a quite wide sense\, 
 which is discussed along a global and local plane wave decomposition of el
 ectromagnetic fields. Geometrical optics for electromagnetic fields can be
  nicely combined with other solutions of Maxwell’s equations\, rigorous 
 and approximate ones\, in order to provide a unified modeling concept for 
 optical systems\, to which we refer to as field tracing.\nIn the talk\, we
  start with a comparison of ray and field tracing concepts as well as its 
 pros and cons for optical modeling and design. Special emphasis is given t
 o geometrical optics for electromagnetic fields. That includes a discussio
 n of a serious weakness of ray tracing\, namely its low convergence in lig
 hting and scattering modeling. It turns out\, that field tracing does not 
 only provide higher modeling accuracy\, but often also higher modeling spe
 ed.\nVarious modeling examples are presented in the talk by demonstrations
  with the optics software VirtualLab. Examples include freeform surfaces\,
  multimode fiber coupling\, and imaging.
LOCATION:Microcity: MC B1 303
STATUS:CONFIRMED
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