Control of zero-crossing temperature of coefficient of thermal expansion and reduction of mechanical residual stress for TiO2-SiO2 glass optical cavity

Mototaka Arakawa, Jun Ichi Kushibiki, Yuji Ohashi, Yuko Maruyama, Naofumi Yamada, Shigeo Nagano, Ying Li, Mizuhiko Hosokawa, Yuko Hanado, Masahiko Watanabe, Koji Watanabe, Kenji Abe, Kazuyuki Etoh, Kazuhiko Ito

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Abstract

We developed a procedure for fabricating a Fabry-Perot optical cavity with less long-term length variation. We fabricated a homogenized TiO2- SiO2 ultralow-expansion (ULE) glass ingot from a commercial TiO2-SiO2 ULE glass ingot with striae. We also controlled the zero-crossing temperature of the coefficient of thermal expansion of the homogenized ingot to approximately 30 °C by heat treatment at 970 °C for 72 h to change the fictive temperature of the ingot. A 100-mm-long cavity spacer was carefully fabricated while reducing the mechanical residual stress introduced by machining. A cavity composed of the spacer and two mirrors of 39-layered Ta2O5/SiO2 films exhibited a high finesse of 420,000 at 729nm and a high length stability of 13 fm/day after 500 days from the beginning of the measurement at a constant temperature of 29.78 °C.

Original languageEnglish
Article number096702
JournalJapanese journal of applied physics
Volume54
Issue number9
DOIs
Publication statusPublished - 2015 Sep 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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    Arakawa, M., Kushibiki, J. I., Ohashi, Y., Maruyama, Y., Yamada, N., Nagano, S., Li, Y., Hosokawa, M., Hanado, Y., Watanabe, M., Watanabe, K., Abe, K., Etoh, K., & Ito, K. (2015). Control of zero-crossing temperature of coefficient of thermal expansion and reduction of mechanical residual stress for TiO2-SiO2 glass optical cavity. Japanese journal of applied physics, 54(9), [096702]. https://doi.org/10.7567/JJAP.54.096702