Abstract
The ability of gradient index (GRIN) materials to correct color in the infrared is explored. An overview of GRIN materials is provided, includ- ing a review of the most common index profiles (axial, radial, and spheri- cal). Due to the high potential for color correction, a design study is carried out to compare a single ZnS/ZnSe GRIN element's imaging performance to that of homogeneous singlets and doublets. A radial GRIN element is able to correct axial color and provide superior performance over an aspheric homogeneous singlet and offer a reduction in weight when com- pared to a homogeneous doublet. The ZnS/ZnSe GRIN is also shown to be superior to other infrared GRIN materials between 3 and 5 μm. © 2013
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