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Proceedings Paper

Phase mask for infrared lens athermalization: design considerations
Author(s): Shay Elmalem; Emanuel Marom
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Paper Abstract

Design of Infra-red (IR) imaging systems requires solutions for overcoming thermal variations of IR lenses, in particular those fabricated out of Germanium. The known thermal dependence of the index of refraction of Germanium results in significant focal shift, which produces image blur. Known solutions to overcome the thermal fluctuations are reviewed. A solution based on an alloptical phase mask with no moving parts will be shown to provide improved imagery for broad band IR scenes in the presence of wide temperature variations. Phase mask design considerations and trade-offs are analyzed.

Paper Details

Date Published: 17 May 2016
PDF: 8 pages
Proc. SPIE 9822, Advanced Optics for Defense Applications: UV through LWIR, 98220F (17 May 2016); doi: 10.1117/12.2222154
Show Author Affiliations
Shay Elmalem, Tel Aviv Univ. (Israel)
Emanuel Marom, Tel Aviv Univ. (Israel)


Published in SPIE Proceedings Vol. 9822:
Advanced Optics for Defense Applications: UV through LWIR
Jay N. Vizgaitis; Bjørn F. Andresen; Peter L. Marasco; Jasbinder S. Sanghera; Miguel P. Snyder, Editor(s)

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