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In low cost mass-produced illumination optics, residual surface roughness can degrade the luminaire intensity, efficiency, and beam quality. For complex optical elements, direct light scattering measurements can be challenging to perform and results cannot easily be interpreted to improve manufactured surface quality. Surface roughness of optical elements and production tools can in principle be measured more easily and can be correlated to scattering if the relevant roughness components are measured.
Here we summarize a method to estimate acceptable roughness levels for a given non-imaging optics application. To validate the approach we compare simulated scattered light levels derived from measured surface roughness of optical elements made with typical manufacturing processes to measured scattered light levels.
15:00 - 15:30
Light engineering with faceted structure
Lihong LIU1, Thierry ENGEL1,2, Yoshitate TAKAKURA1, Manuel FLURY1,2
1Laboratoire des Sciences de l’Ingénieur, de l’Informatique et de l’Imagerie (ICube), UMR CNRS 7357, 300 bd Sébastien Brant, CS 10413, F-67412 Illkirch Cedex, France; 2Institut National des Sciences Appliquées de Strasbourg (INSA Strasbourg) – 24 Boulevard de la Victoire, 67084 Strasbourg Cedex, France
We present a new original structure containing matrix of square mirrors. We obtained it by optimization with Zemax OpticStudio 16 and controlled with LightTools 8.2 from Synopsys. This faceted structure can be employed to reshape an incoherent beam based on the right orientation of each small mirror.