Optical surface roughness improvement using hot isostatic pressing and coating of additively manufactured mirrors

Songnian Tan; Yongsen Xu; Yefei Wang; Lei Shi

doi:10.1117/12.3034060

5 July 2024 Optical surface roughness improvement using hot isostatic pressing and coating of additively manufactured mirrors

Songnian Tan, Yongsen Xu, Yefei Wang, Lei Shi

Author Affiliations +

Proceedings Volume 13183, International Conference on Optoelectronic Information and Functional Materials (OIFM 2024); 131831W (2024) https://doi.org/10.1117/12.3034060
Event: The 3rd International Conference on Optoelectronic Information and Functional Materials (OIFM 2024), 2024, Wuhan, China

Abstract

Selective laser melting additive manufacturing has been employed previously to fabricate lightweight metal mirrors that can be used in aerospace, astronomy, and other fields. However, additively manufactured mirrors have poor surface roughness, which limits their use in practical applications. In this study, additively manufactured mirrors were fabricated with high surface densities for their application in different wavelength bands. Two methods were proposed to fabricate opto-mechanical components, of which one approach involved the fabrication of mirrors that could be used with longer wavelengths. After hot isostatic pressing, the porosity (which is an intrinsic characteristic of 3D printing) and roughness of the mirror substrate were 0.005% and < 8 nm, respectively. To further improve their surface quality, the mirrors were coated with pure Al, which facilitated the matching of the thermal expansion coefficients of the layer and the AlSi10Mg mirror substrate; these mirrors could be used with shorter wavelengths. The roughness of the mirror became < 2 nm when it was coated with pure Al and subjected to optical processing. This approach can be applied to fields that require low-temperature detection techniques, such as aerial measurement and remote sensing, low-temperature light tubes, and near-space detection systems.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Songnian Tan, Yongsen Xu, Yefei Wang, and Lei Shi "Optical surface roughness improvement using hot isostatic pressing and coating of additively manufactured mirrors", Proc. SPIE 13183, International Conference on Optoelectronic Information and Functional Materials (OIFM 2024), 131831W (5 July 2024); https://doi.org/10.1117/12.3034060

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KEYWORDS

Mirrors

Mirror surfaces

Additive manufacturing

Optical surfaces

Aluminum

Coating

Surface roughness

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