A composite gradient index and curved surface anamorphic lens has a gradient index of refraction and at least one curved surface. Combinations of planar and radial gradients with spherical and cylindrical surfaces are described. A corrector for an light source whose beam divergences are different in...http://www.google.se/patents/US4900138?utm_source=gb-gplus-sharePatent US4900138 - Composite gradient index and curved surface anamorphic lens and applications
