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Proceedings Paper

Linear axial GRIN lenses: exact ray-trace and paraxial formulas
Author(s): Jacques Angénieux
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Paper Abstract

In a gradient index (GRIN) material, the index profile, in general, is given by a polynomial. The curved light rays are computed by a step-by-step integration method. Sharma et al., have given the details of the Runge-Kutta method; it is time-consuming and approximate. GRIN materials have now started being offered on the market place. When the gradient is axial (i.e., when the index varies with the depth in the lens, along the optical axis) it is the most useful for optical design of real-life large-aperture imaging systems. These axial gradients, that are offered for sale, are almost linear. Moore et al., have explained their efforts to obtain more linear profiles. When the gradient is exactly linear, the differential equation can be exactly integrated, which saves time for preliminary design through reduced computing time. This paper explains the details of this integration, gives the exact parametric equation of a light ray, and, hence, derives paraxial formulas for focal lengths.

Paper Details

Date Published: 15 April 1993
PDF: 10 pages
Proc. SPIE 1780, Lens and Optical Systems Design, 17800Y (15 April 1993); doi: 10.1117/12.142828
Show Author Affiliations
Jacques Angénieux, Angénieux (France)

Published in SPIE Proceedings Vol. 1780:
Lens and Optical Systems Design
Hannfried Zuegge, Editor(s)

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