Abstract

The indices of refraction and partial dispersions for the chlorides, bromides, and iodides of sodium, potassium, and cesium are suited for making diffraction-limited achromatic doublet lenses that are useful in infrared instruments. This paper describes the four best combinations (from seven materials). Together they cover the infrared over the range λλ 1.5–38 μ. The performance of two lenses of optimized design (KBr–NaCl) is displayed by spot diagrams and test results. Applications of lenses, rather than mirrors, for compact optical systems are discussed.

© 1971 Optical Society of America

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