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18 December 2012 Double tailoring of freeform surfaces for off-axis aplanatic systems
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Abstract
The optical design of freeform surfaces is particularly demanding due to the inherently large number of degrees of freedom. Therefore the technique of tailoring optical freeform surfaces (mirrors or lenses), which is based on solving the underlying differential equations, is routinely used in nonimaging optics to efficiently achieve predefined light distributions. Tailoring can also be employed for imaging optics: an optical freeform surface can be tailored such that one condition is exactly fulfilled - i.e. spherical aberration at a specific point is corrected. Recently, we extended this method such that two freeform surfaces can be tailored at the same time (double tailoring). This gives the freedom to impose a second condition, which is also exactly fulfilled. Thereby, this method allows for instance to simultaneously correct spherical aberration and satisfy additional conditions, i.e. the sine condition. As an example for a tailored off-axis aplanatic system we show a head-up display (HUD) consisting of two simultaneously tailored freeform mirrors
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Angelika Hofmann, Julia Unterhinninghofen, Harald Ries, and Stefan Kaiser "Double tailoring of freeform surfaces for off-axis aplanatic systems", Proc. SPIE 8550, Optical Systems Design 2012, 855014 (18 December 2012); https://doi.org/10.1117/12.981186
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