Temperature dependences of optical path length in fluorine-doped silica glass and bismuthate glass

Akio Koike; Naoki Sugimoto

doi:10.1117/12.646630

28 February 2006 Temperature dependences of optical path length in fluorine-doped silica glass and bismuthate glass

Akio Koike, Naoki Sugimoto

Proceedings Volume 6116, Optical Components and Materials III; 61160Y (2006) https://doi.org/10.1117/12.646630
Event: Integrated Optoelectronic Devices 2006, 2006, San Jose, California, United States

Abstract

Temperature dependences of optical path length (dS/dT; calculated using the equation, dS/dT = dn/dT + na, where a is coefficient of thermal expansion, n is refractive index and dn/dT is temperature coefficient of refractive index) in various oxide glasses were investigated. The dS/dT is generally difficult to adjust by change of glass composition because dn/dT and a are interrelated. However, low dS/dT materials are desired for optical applications such as athermal devices, and high dS/dT materials can be used for thermo-optic devices. Pure silica glass is well-known as a typical low dS/dT material but still not sufficient. Fluorine-doped silica glass showed a lower dS/dT than that of pure silica glass. By fluorine-doping in silica glass, refractive index and dn/dT decreased but a near room temperature stayed at the same level. As a result, the dS/dT decreased with increasing fluorine concentration. On the other hand, bismuthate glass showed the highest dS/dT in this study. Most glasses having high a such as tellurite glass showed negative dn/dT. However, bismuthate glasses showed positive dn/dT in spite of high a. As a result, bismuthate glasses showed quite high dS/dT. These results indicate that dS/dT of the glass can be controllable and that fluorine doped silica glass and bismuthate glass are appropriate candidate materials for optical applications.

Citation Download Citation

Akio Koike and Naoki Sugimoto "Temperature dependences of optical path length in fluorine-doped silica glass and bismuthate glass", Proc. SPIE 6116, Optical Components and Materials III, 61160Y (28 February 2006); https://doi.org/10.1117/12.646630

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