Analytical expressions for the paraxial parameters of a single lens with a spherical distribution of refractive index.
The concept of isoindicial surfaces and position variables is used to develop analytical expressions for the effective focal length and back focal length of a single gradient lens with a spherical distribution of refractive index, where the square of the refractive index is a quadratic function of the distance from the center of symmetry.
Dorić
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S
Renaud
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