Proceedings PaperCompact Refractor Telescopes For The Thermal Infrared
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A growing market for thermal imaging systems has led to a demand for various new types of high performance refractor telescopes. Many system applications impose space constraints which require telescopes with a short overall length and minimum objective aperture oversize. By using high order aspheric surfaces and optical materials other than germanium it is possible to produce telescope designs which are compact and offer other attractive features. One such telescope design is described in detail, the emphasis being placed on the optical design and its effects on different system configurations.