Preparation and environmental simulation tests of large-size silicon carbide brazed reflection mirrors

With the space technologies progress rapidly, demand of large-size mirrors is intensively growing. In this paper, the developing trend of large-size space mirrors was discussed from the angles of material and fabrication technology. Taking 1.0 m aperture technical validation brazed mirror as an example, the design and fabrication of segments, joining and optic machining were analyzed. In addition, the 1.0 m aperture technical validation brazed mirror was performed environmental tests including thermal-vacuum test, vibration test and anti-radiation test in order to evaluate its engineering applicability. The experimental results show that the surface figure of the 1.0 m aperture technical validation brazed mirror changed from 0.038λ (λ=632.8 nm) to 0.037λ and 0.036λ after thermo-vacuum test and vibration test. Additionally, reflectivity of the brazed mirror basically kept stable after ⁶⁰Co γ-ray radiation test, indicating a brilliant application prospect.

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Keywords:

large-size silicon carbide space mirror; joining; surface figure; environmental simulation tests

Funds:

National Natural Science Foundation of China (51972320)

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Get Citation: Liu Yan, Zhang Hui, Liu Leimin, et al. Preparation and environmental simulation tests of large-size silicon carbide brazed reflection mirrors[J]. Opto-Electronic Engineering, 2020, 47(8): 200088.

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