Optical Requirements For Thermal Imaging Lenses

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Abstract
Previously detected deviations observed when measuring the transverse ray aberrations of polycrystalline germanium lenses have been shown to be due to localised refractive index changes at the crystal grain boundaries (striae). It is suggested that these changes are due to stress introduced into the material during manufacture rather than being due to the compositional alterations which are responsible for enhanced optical absorption in these regions. These localised variations in index have been shown to adversely affect the optical performance of lenses constructed from small grain size polycrystalline germanium.

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