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Thermal Properties of Optical Substrates

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Thermal Properties of Optical Substrates

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For applications prone to temperature fluctuations, an athermal optical system should be developed. Athermal optical systems are insensitive to an environment’s thermal change and the resulting system defocus. Developing an athermal design, which is dependent on the thermal expansion coefficient or coefficient of thermal expansion (CTE) and the change in index with temperature (dn/dT) of the materials, is especially critical in the infrared. CTE is a generalized term for one of three measures of the fractional change of a material's size, area, or volume due to a change in temperature.

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