Broadband IR transparent rain erosion protective coating for IR windows

Paul Klocek; James T. Hoggins; Michael Wilson

doi:10.1117/12.130799

14 December 1992 Broadband IR transparent rain erosion protective coating for IR windows

Paul Klocek, James T. Hoggins, Michael Wilson

Proceedings Volume 1760, Window and Dome Technologies and Materials III; (1992) https://doi.org/10.1117/12.130799
Event: San Diego '92, 1992, San Diego, CA, United States

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.

Citation Download Citation

Paul Klocek, James T. Hoggins, and Michael Wilson "Broadband IR transparent rain erosion protective coating for IR windows", Proc. SPIE 1760, Window and Dome Technologies and Materials III, (14 December 1992); https://doi.org/10.1117/12.130799

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