1 June 1997 Material problem in athermalization of optical systems
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Three thermal effects—variation of image location, variation of focal length and longitudinal chromatism—are described in the form of formulas, which include surface distributions proportional to the thermal constants. Principles for the optical system athermalization by means of optical (passive) compensation and thermooptical (active) compensation are given. The problem of proper selection of thermal material constants and mechanical constants of lenses and mounts is discussed. The condition for achromatization in the form of the formula including material distributions and the principle of material selection is given.
Tadeusz Kryszczynski, Marcin Lesniewski, "Material problem in athermalization of optical systems," Optical Engineering 36(6), (1 June 1997). https://doi.org/10.1117/1.601177

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