Importance of optical homogeneity for high-quality transparent ceramics |
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| Affiliation: | 1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. Institute of Physics of the Czech Academy of Sciences, 16200, Prague, Czech Republic;4. King Mongkut''s University of Technology Thonburi, Bangkok 10140, Thailand;1. Department of Materials Engineering, Ben-Gurion University of the Negev, P.O.B 653, Beer-Sheva 8410501, Israel;2. Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, P.O.B 653, Beer-Sheva 8410501, Israel;3. Ilse Katz institute for Nanoscale science and Technology, Ben-Gurion University of the Negev, P.O.B 653, Beer-Sheva 8410501, Israel;4. DDR&D IMOD, Hakirya, Tel Aviv 61909, Israel;1. Department of Physics, Shanghai University, Shanghai 200444, People’s Republic of China;2. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China;3. Jiangsu Normal University, Jiangsui 221116, People’s Republic of China;1. Kazuo Inamori School of Engineering, New York State College of Ceramics, Alfred University, Alfred, NY 14802, USA;2. Institute of Low Temperature and Structure Research, Polish Academy of Sciences in Wroc?aw, W. Trzebiatowski Institute, ul. Okolna 2, 50–422 Wroclaw, Poland |
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| Abstract: | Two types of transparent Y2O3 ceramics without including large scattering sources such as residual pores, one with very high optical homogeneity (type A) and another one with slightly insufficient optical homogeneity (type B), are purposely prepared, and their optical properties are investigated and compared qualitatively and quantitatively. Type A ceramic exhibits transmittance characteristics with very low internal loss in the visible to infrared wavelength region, while type B ceramic is inferior in various optical performances especially in the short (visible) wavelength region. In type B ceramic, birefringence occurs due to optical inhomogeneity in the visible region, resulting in a decrease in the extinction ratio. Non-uniform refractive index distribution is also observed in the Schlieren image of type B ceramic, hence the laser beam quality through that material is degraded. This study proved the importance of optical homogeneity of transparent ceramics and clarified the problems in actual applications. |
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| Keywords: | Optical ceramics Homogeneity Scattering Refractive index Laser |
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