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Limitations of the ray mapping approach in freeform optics design

: Bruneton, A.; Bäuerle, A.; Wester, R.; Stollenwerk, J.; Loosen, P.


Optics Letters 38 (2013), Nr.11, S.1945-1947
ISSN: 0146-9592
Fraunhofer ILT ()

It was previously demonstrated by Bäuerle et al. [Opt. Express 20, 14477 (2012)] that the computation of ray paths through the optical system (ray mapping) can be used to design multisurface freeform optical elements creating a prescribed irradiance pattern for a zero-étendue source. The procedure outlined there uses the heuristic step of reducing the ray mapping's curl to improve adherence to surface integrability criteria. This Letter formally derives a quantitative estimate for the limitations of this approach in the collimated case and shows the key factors influencing the quality of the final optics.