10 July 2018 Dense black absorbing coatings for parasitic light reduction
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Abstract
Parasitic light is an important issue in optical systems and may be responsible for huge limitation of final performances. Use of absorbing coated surfaces is known to be an efficient means to reduce such parasitic light sources and various solutions exist that can be applied to mechanical surfaces such as black paints, carbon nanotubes or surface passivation.

In this paper, we show how thin film multilayer coatings can be a solution to answer this problematic as it is possible to design accurate spectral response that presents a very low level of reflectance with a zero value of transmittance.

After a description of the design steps, we will focus on the realization of such sophisticated metal-dielectric multilayer stacks using dense coating techniques; in particular, we will show that master of refractive index of very thin metallic layers is an asset to achieve accurate performances and how in situ optical broadband monitoring allows excellent reproducibility of production processes even for few nanometers-thick layers required in metal-dielectric absorbers.

Spectral and angular measurements of different coatings solutions will be given on various types of substrates (glass or metallic). Environmental qualification tests and spectral characterizations are also presented showing the stability of the performances in severe conditions compatible with severe environment. In particular, coatings developed for various projects will illustrate this study.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hélène Krol, Grégory Chauveau, Colin Bondet de la Bernardie, Baptiste Grasmuck, Dragan Stojcevski, and Catherine Grèzes-Besset "Dense black absorbing coatings for parasitic light reduction", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 1070620 (10 July 2018); doi: 10.1117/12.2313430; https://doi.org/10.1117/12.2313430
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