Low reflectance DLC coatings on various IR substrates

Mordechai Gilo; Amnon Azran

doi:10.1117/12.917299

31 May 2012 Low reflectance DLC coatings on various IR substrates

Mordechai Gilo, Amnon Azran

Proceedings Volume 8353, Infrared Technology and Applications XXXVIII; 835320 (2012) https://doi.org/10.1117/12.917299
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

Diamond Like Carbon (DLC) or Hard Carbon (HC) single layer coatings on optical substrates are commonly used. As a single layer, the resulting average reflectance in different spectral ranges (about 2.5% in the 3-5 μm region) needs improvements. We propose multilayer coatings having a DLC upper layer applied on Si, Ge and other materials. These coatings result in an average reflection of less than 0.5% in either the 3.4-5 μm or the 8-11.5 μm regions. The average transmittance in these regions is more than 97%. The durability is comparable to single layer DLC coatings. These coatings are suitable to front surface FLIR lens assemblies. The effect on the performance of a zoom lens assembly and the reduction of the Narcissus effect is shown.

Citation Download Citation

Mordechai Gilo and Amnon Azran "Low reflectance DLC coatings on various IR substrates", Proc. SPIE 8353, Infrared Technology and Applications XXXVIII, 835320 (31 May 2012); https://doi.org/10.1117/12.917299

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