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Proceedings Paper

Material and application study for low thermal expansion glass-ceramic CLEARCERAM series
Author(s): Kousuke Nakajima; Toshihide Nakajima; Nobuo Kawasaki; Yoshiyuki Owari
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Paper Abstract

Material properties and performances for near future applications were studied for low thermal expansion glass-ceramics; CLEARCERAM series produced by OHARA Inc. In the material study, the improved CTE characteristics of CLEARCERAM-Z HS over conventional CLEARCERAM-Z were shown with interferometric CTE metrology system with 2ppb/degree C repeatability. Also the material uniformity was evaluated by means of refractive index homogeneity. In the application study, the capabilities of CLEARCERAM-Z HS for near future precision applications, Extreme Ultra Violet Lithography (EUVL) system component and extremely large telescope mirror applications were discussed by reviewing actual data prepared in accordance with the existing specifications for each application. For EUVL system component application, inter lot CTE uniformity and surface finish data meeting the SEMI P37 specification were presented and the performance was evaluated. For extremely large telescope mirror application, intra disk uniformity of CTE and stress birefringence for Dia.780mm CLEARCERAM-Z HS meeting mirror blanks specification of existing extremely large telescope project were demonstrated and the potential performance of CLEARCERAM-Z HS for the application was shown with the on-going integration of the size availability at OHARA Inc.

Paper Details

Date Published: 18 August 2005
PDF: 12 pages
Proc. SPIE 5868, Optical Materials and Structures Technologies II, 58680T (18 August 2005); doi: 10.1117/12.616070
Show Author Affiliations
Kousuke Nakajima, OHARA Inc. (Japan)
Toshihide Nakajima, OHARA Inc. (Japan)
Nobuo Kawasaki, OHARA Inc. (Japan)
Yoshiyuki Owari, OHARA Inc. (Japan)


Published in SPIE Proceedings Vol. 5868:
Optical Materials and Structures Technologies II
William A. Goodman, Editor(s)

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