Optical performance of aluminum mirror for cryogenic applications

Liu, Fuhe; Jia, Ping; Shen, Honghai; Yu, Xu

doi:10.1016/j.ijleo.2021.166282

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…Additionally, the optical system could achieve the optimal athermal effect when the mirror and the mounting structures were made of the same materials. Liu et al optimized and manufactured an Al mirror with an aperture of 160 mm [ 10 ]. According to the test results, the error budget showed that the mirror kept a fine surface shape at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of an Additively Manufactured Aluminum Mirror with Compound Surfaces

et al. 2022

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Microsatellites have a great attraction to researchers due to their high reliability, resource utilization, low cost, and compact size. As the core component of the optical payload, the mirror directly affects the system package size. Therefore, the structural design of mirrors is critical in the compact internal space of microsatellites. This study proposes a closed-back mirror with composite surfaces based on additive manufacturing (AM). Compared with the open-back mirror, it provides excellent optomechanical performance. In addition, AM significantly reduces the intricate mechanical parts’ manufacturing difficulty. Finally, the roughness was better than 2 nm. The surface shape of the AM aluminum mirror reached RMS 1/10λ (λ = 632.8 nm) with the aid of ultra-precision machining technologies such as single-point diamond turning (SPDT), surface modification, and polishing, and the maximum deviation of the surface shape was about RMS 1/42λ (λ = 632.8 nm) after the thermal cycle test, which verified the optical grade application of AM.

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Section: Introductionmentioning

confidence: 99%

Design and Fabrication of an Additively Manufactured Aluminum Mirror with Compound Surfaces

et al. 2022

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High precision polishing of aluminum alloy mirrors through a combination of magnetorheological finishing and chemical mechanical polishing

Bai,

Zhang,

et al. 2024

Opt. Express

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After the aluminum alloy mirror machined by single point diamond turning (SPDT), the residual tool marks and surface accuracy of the aluminum alloy mirror cannot meet the requirements of visible or ultraviolet light system. In this study, a processing method combining magnetorheological finishing (MRF) and chemical mechanical polishing (CMP) is proposed to realize the polishing of aluminum alloy mirrors with high efficiency, high precision and high-quality. Firstly, the properties and composition of passivation layer after MRF were analyzed and the polishing performance of acidic, neutral and alkaline alumina polishing fluid on passivation layer were investigated based on the computer numerical control (CNC) polishing equipment. Based on the experimental results, a new acidic nano-silica polishing fluid which is suitable for the efficient and high-quality removal of passivation layers on aluminum alloy surfaces was developed. Finally, a combined approach of MRF-CMP was used to the directly polishing of a rapidly solidified aluminum mirror (RSA-6061) with a diameter of 100 mm after SPDT. With two iterative of MRF-CMP polishing in 220 minutes, the surface accuracy of the aluminum alloy mirror was improved from 0.1λ (λ=632.8 nm) to 0.024λ, and the surface roughness (Ra) decreased from 3.6 nm to 1.38 nm. The experiment results manifest that high precision, and high-quality aluminum alloy mirror can be achieved by MRF-CMP method with the new developed acid nano-silica polishing fluid and suitable MR polishing fluid. The research results will provide a new strategy for ultra-precision direct polishing of aluminum alloy mirrors and will also give the important technical support for the extensive use of aluminum alloy mirror in visible light and ultraviolet optical systems.

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Optical performance of aluminum mirror for cryogenic applications

Cited by 2 publications

References 15 publications

Design and Fabrication of an Additively Manufactured Aluminum Mirror with Compound Surfaces

Design and Fabrication of an Additively Manufactured Aluminum Mirror with Compound Surfaces

High precision polishing of aluminum alloy mirrors through a combination of magnetorheological finishing and chemical mechanical polishing

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