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Proceedings Paper

Broadband IR transparent rain erosion protective coating for IR windows
Author(s): Paul Klocek; James T. Hoggins; Michael Wilson
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Paper Abstract

Texas Instruments (TI) has an ongoing development effort for protective coatings to enhance the environmental durability, particularly against water and particle impact, of infrared (IR) (8 to 12 micrometers ) transmissive windows and domes on airborne platforms. This program has produced a very effective, rain-erosion-resistant coating consisting of polycrystalline or epitaxial gallium phosphide (GaP). The GaP coating has been grown on germanium (Ge), gallium arsenide (GaAs), and zinc sulfide (ZnS) window/dome materials using a metal-organic chemical vapor deposition (MOCVD) process. The coatings have low IR absorption coefficients of 2 cm-1 at 10.6-micrometers wavelength, as measured by laser calorimetry. At a thickness of 20 micrometers , these GaP coatings degrade the transmission of the window/dome materials by only 1 percent. These high-transmission coatings have been shown to be very effective in protecting the window/dome materials from rain impact damage, as evidenced in testing by single-waterdrop impact, multiple-impact jet apparatus and whirling arm rain erosion. The details of the properties of these GaP IR protective coatings are presented and discussed.

Paper Details

Date Published: 14 December 1992
PDF: 14 pages
Proc. SPIE 1760, Window and Dome Technologies and Materials III, (14 December 1992); doi: 10.1117/12.130799
Show Author Affiliations
Paul Klocek, Texas Instruments Inc. (United States)
James T. Hoggins, Texas Instruments Inc. (United States)
Michael Wilson, Naval Air Warfare Ctr. (United States)


Published in SPIE Proceedings Vol. 1760:
Window and Dome Technologies and Materials III
Paul Klocek, Editor(s)

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