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Infrared optics defocus with temperature change due to the nature of the optical materials employed in their design. Methods of eliminating this defocus - mechanical, electro-mechanical and optical - are discussed and evaluated in detail.
Philip J. Rogers
"Athermalization of IR optical systems", Proc. SPIE 10260, Infrared Optical Design and Fabrication: A Critical Review, 102600F (1 October 1991); https://doi.org/10.1117/12.48455
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Philip J. Rogers, "Athermalization of IR optical systems," Proc. SPIE 10260, Infrared Optical Design and Fabrication: A Critical Review, 102600F (1 October 1991); https://doi.org/10.1117/12.48455