Abstract

High NA molded glass objective lenses are commercially available for use in the 680 nm to 850 nm range. We show that a simple positive lens can be used with an objective lens to compensate for wavelength-induced aberration in the 400 nm to 700 nm range. There is a direct relationship between the optimum power of the corrector lens and the wavelength of interest. We also show that a single positive lens and a holographic optical element can be used with an objective lens to compensate for wavelength-induced aberration over a wide range of wavelengths.

© 1995 Optical Society of America

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