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Proceedings Paper

Transparent athermal glass-ceramics in Li2O-Al2O3-SiO2 system
Author(s): Yusuke Himei; Tomohiro Nagakane; Akihiko Sakamoto; Naoyuki Kitamura; Kohei Fukumi; Junji Nishii; Kazuyuki Hirao
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Paper Abstract

An attempt has been conducted to develop multicomponent transparent glass-ceramics which have athermal property better than silica glass. Transparent Li2O-Al2O3-SiO2 (LAS) glass-ceramics with small thermal expansion coefficient was chosen as a candidate. Athermal property of the glass-ceramics was improved by the independent control of temperature coefficients of electronic polarizability and thermal expansion coefficient, both of which govern the temperature coefficient of optical path length. It was found that temperature coefficient of electronic polarizability and thermal expansion coefficient of the LAS glass-ceramics were controllable by the additives and crystallization conditions. The doping of B2O3 and the crystallization under a hydrostatic pressure of 196 MPa were very effective to reduce temperature coefficient of electronic polarizability without a remarkable increase in thermal expansion coefficient. It was deduced that the reduction in temperature coefficient of electronic polarizability by the crystallization under 196 MPa resulted from the inhibition of the precipitation of beta-spodumene solid solution. The relative temperature coefficients of optical path length of B2O3-doped glass-ceramic crystallized under 196 MPa was 11.7 x 10-6/°C, which was slightly larger than that of silica glass. Nevertheless, the thermal expansion coefficient of this glass-ceramic was smaller than that of silica glass.

Paper Details

Date Published: 4 April 2005
PDF: 8 pages
Proc. SPIE 5723, Optical Components and Materials II, (4 April 2005); doi: 10.1117/12.590268
Show Author Affiliations
Yusuke Himei, New Glass Forum (Japan)
Tomohiro Nagakane, Nippon Electric Glass Co., Ltd. (Japan)
Akihiko Sakamoto, Nippon Electric Glass Co., Ltd. (Japan)
Naoyuki Kitamura, National Institute of Advanced Industrial Science and Technology (Japan)
Kohei Fukumi, National Institute of Advanced Industrial Science and Technology (Japan)
Junji Nishii, National Institute of Advanced Industrial Science and Technology (Japan)
Kazuyuki Hirao, Kyoto Univ. (Japan)


Published in SPIE Proceedings Vol. 5723:
Optical Components and Materials II
Shibin Jiang; Michel J.F. Digonnet, Editor(s)

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