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Proceedings Paper

The development of CVD infrared optics from planar windows to missile domes
Author(s): Tim P. Mollart
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Paper Abstract

Chemical Vapour Deposited (CVD) diamond can now be fabricated in the form of large planar windows (up to 120mm in diameter and 2mm thick) and hemispherical domes (up to 70mm in diameter) suitable for operation as ultra-robust, aerospace infrared (IR) apertures. This paper describes the optical properties of such components. Many of the optical properties of large area CVD diamond windows are governed by its polycrystalline structure, in this paper its fracture strength properties are also related to its structure. It is shown that 3-point bend techniques are an appropriate method for testing the strength of CVD diamond and that its strength is dictated by internal bulk flaws that are similar in size to the grains of the diamond. Its unsurpassed rain and sand erosion properties are briefly discussed and its shown that its solid particle erosion properties are related to its grain structure and that in liquid impact its properties are also significantly affected by its polycrystalline nature.

Paper Details

Date Published: 26 September 2003
PDF: 10 pages
Proc. SPIE 5078, Window and Dome Technologies VIII, (26 September 2003); doi: 10.1117/12.500982
Show Author Affiliations
Tim P. Mollart, QinetiQ (United Kingdom)


Published in SPIE Proceedings Vol. 5078:
Window and Dome Technologies VIII
Randal W. Tustison, Editor(s)

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