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Proceedings Paper

Optical Requirements For Thermal Imaging Lenses
Author(s): Colin Lewis; Richard H. Runalls; Graham N. Turner; Steve T. Davies
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Paper 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.

Paper Details

Date Published: 25 September 1979
PDF: 7 pages
Proc. SPIE 0163, Advances in Optical Production Technology II, (25 September 1979); doi: 10.1117/12.956904
Show Author Affiliations
Colin Lewis, Royal Armament Research and Development Establishment (United Kingdom)
Richard H. Runalls, Royal Armament Research and Development Establishment (United Kingdom)
Graham N. Turner, Royal Armament Research and Development Establishment, (United Kingdom)
Steve T. Davies, Royal Armament Research and Development Establishment, (United Kingdom)


Published in SPIE Proceedings Vol. 0163:
Advances in Optical Production Technology II

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