Mr. Masao Asai Profile

Masao Asai

at KYOCERA Corp

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Proceedings Article | 26 August 2024 Poster + Paper

Investigating subtle inhomogeneity in coefficient of thermal expansion of fine cordierite for large mirrors

Koki Isoyama, Yuji Ikeda, Yasuhiro Nakahori, Takato Honjou, Hidehito Himeno, Masao Asai, Masatsugu Kamiura

Proceedings Volume 13100, 1310044 (2024) https://doi.org/10.1117/12.3019358

KEYWORDS: Inhomogeneities, Mirrors, Cordierite, Beam splitters, Optical surfaces, Reflection, Materials properties, Zerodur

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In large mirrors used in astronomical applications and mirrors used in low-temperature environments, low-thermal expansion glass (ULE^®) or glass ceramic (ZERODUR^® or CLEACERAM^TM-Z) is generally used because the mirror shape is not deformed due to changes in environmental temperature. In recent years, low-thermal expansion ceramic cordierites have been attracting attention as a new material. This is because it exhibits high thermal conductivity and rigidity while having the same linear expansion coefficient (CTE) as low-expansion glass and low-expansion glassceramic. CTE is the most important thermal property that indicates the usefulness of low-expansion mirror materials, but uniformity of CTE within the material is also an important property, especially in large glasses. This is because the inhomogeneity of CTE generates internal thermal stress of the material, which appears as an error in the surface shape on the mirror surface. Therefore, we investigated the inhomogeneity of the CTE of Fine cordierite (CO220O, CO720O from Kyocera Corporation), which has not been clarified so far. After producing a Fine Cordierite mirror and dividing it into sample pieces, the CTE value of each sample was measured using a laser thermal dilatometer. The structure function at 22 °C was calculated and the inhomogeneity of CTE was evaluated.

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