| Citation: | YUAN Jian, PEI Si-yu, HUO Zhan-wei, ZHANG Guan-chen, ZHANG Lei. Design of central support structure for large aperture mirror with wide working temperature[J]. Chinese Optics. doi: 10.37188/CO.2024-0060
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In order to improve the communication quality of LEO-OGS laser link, commercial ground station telescopes equipped with large aperture primary mirror need to adapt to harsh outdoor temperature conditions.
A central support scheme based on room temperature vulcanized silicone rubber was proposed for a high-precision primary mirror with optical aperture of 500 mm. The structure consists of a Zerodur mirror blank, a pair of bushing and support made of titanium alloy, and a 1mm-thick adhesive layer which can effectively reduce the thermal stress inside assembly while temperature changes and unload the gravity of mirror blank. The thickness and height of the adhesive layer were determined by optimization. Specially designed fixture can accurately control the shape and thickness of the adhesive layer, meanwhile the ventilation holes on the bushing promote its full solidification.
Simulation indicates that the surface shape accuracy of primary mirror is 4.199 nm in RMS under 40 °C temperature variation, with 13.748 nm under vertical gravity, and 4.187 nm under horizontal gravity, accompanied by the maximum mirror inclination and displacement of 4.722" and 3.597 μm, and the fundamental frequency of the assembly reaches 53.45 Hz. The measured surface shape accuracy of primary mirror is RMS 0.017λ (λ=632.8 nm), after extensive heat cycling test and vacuum coating, the surface can maintain high-precision.
The central support structure can significantly improve the temperature adaptability of precise mirrors, and has broad application in large-scale ground optoelectronic equipment.
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