27 April 2009 Predicted and measured transmission and diffraction by a metallic mesh coating
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Metallic mesh coatings are used on visible and infrared windows and domes to provide shielding from electromagnetic interference (EMI) and as heaters to de-fog or de-ice windows or domes. The periodic metallic mesh structures that provide the EMI shielding and/or resistive electrical paths for the heating elements create a diffraction pattern when optical or infrared beams are incident on the coated windows. Over the years several different mesh geometries have been used to try to reduce the effects of diffraction. We have fabricated several different mesh patterns on small coupons of BK-7 and measured the transmitted power and the diffraction patterns of each one using a CW 1064 nm laser. In this paper we will present some predictions and measurements of the diffraction patterns of several different mesh patterns.
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Jennifer I. Halman, Jennifer I. Halman, Keith A. Ramsey, Keith A. Ramsey, Michael Thomas, Michael Thomas, Andrew Griffin, Andrew Griffin, } "Predicted and measured transmission and diffraction by a metallic mesh coating", Proc. SPIE 7302, Window and Dome Technologies and Materials XI, 73020Y (27 April 2009); doi: 10.1117/12.818760; https://doi.org/10.1117/12.818760

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