A general ray tracing algorithm for gradient-index media that treats various refractive index distributions in a unified manner has been developed by implementing the concept of isoindicial surfaces, position variables, and cubic splines. A novel and simpler algorithm for optical path length calculations is also presented.
© 1990 Optical Society of America
Sead Dorić, "Ray tracing through gradient-index media: recent improvements," Appl. Opt. 29, 4026-4029 (1990)