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An Introduction to Passive Athermalization

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An Introduction to Passive Athermalization

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For applications prone to temperature fluctuations, it is important to develop an athermal optical system: an optical system that is insensitive to an environment’s thermal change and the resulting system defocus. Developing an athermal design, which is dependent on the Coefficient of Thermal Expansion (CTE) of the materials and the change in index with temperature (dndT), is especially critical in the infrared.

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