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9 September 2019 Cold glass shaping of coated mirrors: characterization of the process
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Abstract
The cold shaping of thin glass foils is a cost-effective method for x-ray optical units realization. This technique allows the manufacturing of cheap and lightweight optics with good angular resolution. The flat glass foils are shaped on curved integration molds and glued ribs freeze their shapes in the assembly. The simplest strategy for the coating deposition would be with the coating process operated on flats, before the bending and the integration steps. This approach can be considered only if the coating on the glass foils does not degrade with the integration process. Given that super-mirror coating is widely used in hard X-ray telescopes, this part of the process need to be carefully evaluated. INAF-OAB collaborates with Tongji University to verify the feasibility of this approach. In this paper, we present the experimental results achieved on glass samples, integrated with the Cold Slumping technique by means of integration mold with different radius of curvature and material. Two flat samples, coated with W/Si multilayer, are characterized before and after the integration. The measurement campaign includes micro-roughness on different spatial frequency and grazing incidence reflection measurements to return the microstructure of the multilayer.
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Yang Yang, M. Civitani, S. Basso, G. Pareschi, Tongzhou Li, Runze Qi, and Zhanshan Wang "Cold glass shaping of coated mirrors: characterization of the process", Proc. SPIE 11119, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IX, 111190W (9 September 2019); https://doi.org/10.1117/12.2529372
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