From steelmaking glass to athermal glass

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Optical communication by the wavelength division multiplexing technique requires the arrayed waveguide grating device for merging and dividing various optical signals. This device should be made of 'athermal glass' which shows no temperature dependence in the optical path length. One of the candidate materials is multicomponent silicate glass, for which slags from steelmaking industries are expected to be used. In the present work, the refractive indices (n), their temperature dependencies (dn/dT) and the linear coefficients of thermal expansion (α) were determined for SiO_2 glasses with other oxide additions to evaluate the athermal characteristics. The glass of 80mol%SiO_2-5TiO_2-15Na_2O was found to have good athermal characteristic and could be a promising composition in practice owing to its lower melting temperature than SiO_2.