Starting from the ray equation, analytic solutions for the ray paths are found and used to determine the equivalent focal length and the cardinal points of tapered gradient-index (GRIN) rods.
© 1980 Optical Society of America
Original Manuscript: July 20, 1979
Published: April 1, 1980
S. J. S. Brown, "Geometrical optics of tapered gradient-index rods," Appl. Opt. 19, 1056-1060 (1980)