Optical Design of a Collimator Lens That Is Very Stable Against Chromatic Variation

Abstract

To minimize chromatic variations across a wavelength band, we suggest a new design that corrects the firstand second-order wavelength derivatives of the refractive power. Based on this method, a diffraction-limited collimator is designed. The design is very stable against wavelength change, as expected. The chromatic change of the effective focal length is less than 0.002% in the wavelength range from 360 to 410 nm.