Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Freeform optics for nonidealized light sources in 3D: A phasespace approach
 Kidger, T.E. ; Society of PhotoOptical Instrumentation Engineers SPIE, Bellingham/Wash.: Illumination Optics V : 1416 May 2018, Frankfurt, Germany Bellingham, WA: SPIE, 2018 (Proceedings of SPIE 10693) ISBN: 9781510619234 ISBN: 9781510619241 Paper 106930J, 7 pp. 
 Conference "Illumination Optics" <5, 2018, Frankfurt> 

 English 
 Conference Paper 
 Fraunhofer ILT () 
Abstract
Freeform optics have been proven to be a very powerful and efficient illumination strategy with applications ranging from automotive and architecture illumination to laser beam shaping. State of the art freeform optics design methods assume that the light has zero étendue, which is for example given if it is emitted from a point source or perfectly collimated. In some cases, this assumption is not valid and designing freeform optics with a zeroétendue method and using a nonzero étendue source will result in a blurring effect for sharp edges in the irradiance pattern. In previous work1, we derived an integral formulation for the irradiance distribution on a target screen for a nonzero étendue source. Furthermore, we showed for a 2Dapplication that it is possible to combine this irradiance calculation method with a surface optimization routine to obtain freeform optics that also take into account a nonzero étendue. As a continuation, we extend this approach to three dimensions. To this end, we show how the integral formulation can be approximated numerically in three dimensions and we present an optimization method for the freeform optics. We demonstrate the performance of the algorithm by using two different test cases. For the second test case, we additionally present how the achieved irradiance distribution varies with the étendue of the source.