Stray light reduction of silicon particle reinforced aluminum for optical systems

Jan Kinast; Alexander Telle; Sven Schröder; Marcus Trost; Stefan Risse

doi:10.1117/12.2536007

12 July 2019 Stray light reduction of silicon particle reinforced aluminum for optical systems

Jan Kinast, Alexander Telle, Sven Schröder, Marcus Trost, Stefan Risse

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Proceedings Volume 11180, International Conference on Space Optics — ICSO 2018; 111802G (2019) https://doi.org/10.1117/12.2536007
Event: International Conference on Space Optics - ICSO 2018, 2018, Chania, Greece

Abstract

Silicon particle reinforced aluminum containing 42 wt.% silicon (Al-42Si) offers higher specific stiffness, higher resistance to thermal gradients, and an athermal behavior combined with electroless nickel, in comparison to state-of-the-art aluminum alloys (e.g. Al6061). Nevertheless, typical surface modifications (e.g. black anodization) lead to a nonsufficient optical stray light suppression due to the high amount of silicon particles on the surface. Therefore, a coating technique is required that fulfils the optical and the mechanical (e.g. adhesive strength) specifications for stray light reduction on Al-42Si. Different components like housings and barrels made of Al-42Si were coated with amorphous NiP and with Fractal Black^™ by Acktar Ltd. The optical performance is analyzed by angle-resolved light scattering (ARS) at two different wavelengths (532 nm and 1064 nm). Fractal Black^™ offers a total scattering level of lower than 2 % at 532 nm and 1064 nm. Fractal Black^™ has been proven as a suitable coating for components made of Al-42Si.

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Jan Kinast, Alexander Telle, Sven Schröder, Marcus Trost, and Stefan Risse "Stray light reduction of silicon particle reinforced aluminum for optical systems", Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 111802G (12 July 2019); https://doi.org/10.1117/12.2536007

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KEYWORDS

Aluminum

Stray light

Optical coatings

Silicon

Particles

Fractal analysis

Mirrors

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