A fifth-order algebraic formula is derived for the axial deviation of the ray observed behind the GRIN lens exit face, whose expansion coefficients characterize the coefficients up to sixth-order in the index profile of a GRIN lens with arbitrary length; the index coefficients up to sixth-order of a near one-quarter pitch lens are estimated with the formula. The proposed technique would be useful for the evaluation of a GRIN lens with larger spherical aberrations and a longer GRIN rod.
© 1983 Optical Society of America
Toyokazu Sakamoto, "GRIN lens profile measurement by ray trace analysis," Appl. Opt. 22, 3064-3069 (1983)