The chromatic correction of zoom lenses for LWIR spectral range

Abstract

Numerical simulations of longitudinal chromatic aberration in a four-component LWIR continuous zoom lens coupled to an uncooled detector are presented. The results have shown that in schemes containing two optical materials, most solutions involve the outer components made of germanium and the inner components made of materials with lower dispersion coefficients (chalcogenide glasses). The results are confirmed by the developed lens with a zoom ratio of 5X.