Abstract
Freeform surfaces offer the optical designer additional degrees of freedom to achieve good imaging properties in compact folded geometries. However, visualization and calculation of aberrations for non-rotational symmetric systems is complex. In this article we employ phase space methods to represent the optical system by a transformation of the ray positions and angels. Extraction of the linear system behavior and comparison to real ray-tracing behavior allows a general visualization of aberration generation and propagation in freeform systems. Also mathematically the individual surface aberration contributions can be calculated. A freeform prism system is employed for illustrating this method.
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