21 May 2018 Over-designed and under-performing: design and analysis of a freeform prism via careful use of orthogonal surface descriptions
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Abstract
In this paper, two freeform prism combiner designs with different geometries were studied. The first design, whose geometry is driven by the need for total-internal-refraction, achieves optical performance suitable for use in AR/VR applications, but involves highly complex surfaces and highly non-uniform performance. The second design, which removes the total-internal-refraction requirement, adopts a modified geometry which enables significantly improved aberration correction potential. The nodal-aberration-theory based design process is shown for both prism designs, and the optical performance of each design was analyzed. Performance exceeds 10% MTF at 50lp/mm over centered and decentered 3mm effective subpupils, evaluated at nine different positions within an 8mm diameter eyebox.
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Nicholas Takaki, Wanyue Song, Anthony J. Yee, Julie Bentley, Duncan Moore, Jannick P. Rolland, "Over-designed and under-performing: design and analysis of a freeform prism via careful use of orthogonal surface descriptions", Proc. SPIE 10676, Digital Optics for Immersive Displays, 1067616 (21 May 2018); doi: 10.1117/12.2315641; https://doi.org/10.1117/12.2315641
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