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Freeform gradient index generalized Coddington’s equations

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Abstract

Coddington’s equations and their generalized forms are useful for lens design and analysis of optical performance. Generalized Coddington’s equations (GCE) exist in literature for analysis of decentered systems and freeform surfaces, but not for gradient index (GRIN) lenses. In this work, GCE are presented for the analysis of freeform GRIN lenses with freeform surfaces. Examples are shown where the presented theory converges on Coddington’s equations and known paraxial GRIN behavior. The method also correctly shows known afocal behavior proximate to azimuthally directed rays in a cylindrical GRIN. The latter case is one of analytically validated local freeform behavior.

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Equations (37)

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