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Gradient-index slab lens with high numerical aperture

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Abstract

A near-parabolic profiled 1-D lens with high N.A. (=0.70) has been fabricated by an indiffusion ion exchange and cementing technique. Maximum longitudinal aberration is lower than 0.2 mm all over the lens thickness. The focused beamwidth is ~5 μm.

© 1986 Optical Society of America

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