Abstract

Plasma ion-assisted deposition with an advanced plasma source was investigated to produce narrow-bandpass filters in the near-infrared spectral range for telecommunication applications. The multilayer coatings were qualified by the optical performance, the vacuum-to-air behavior, the temperature stability, and the film stress. TiO2/SiO2 and Ta2O5/SiO2 material combinations were used and compared. The coating system produced low absorbing multilayers with a very low coefficient of expansion and low stress. The coefficient of expansion was in the low 10−6 °C range, and film stress values in the range between 1 and 2 × 108 N/m2 were obtained. TiO2/SiO2 was the preferred material combination. The optical monitoring system allowed the production of bandpass filters with a performance close to that of the theoretical values.

© 1996 Optical Society of America

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