${\mathrm{ZrO}}_2–{\mathrm{SiO}}_2$ and ${\mathrm{Nb}}_2{\mathrm{O}}_5–{\mathrm{SiO}}_2$ mixture coatings as well as those of pure zirconia ( ${\mathrm{ZrO}}_2$ ), niobia ( ${\mathrm{Nb}}_2{\mathrm{O}}_5$ ), and silica ( ${\mathrm{SiO}}_2$ ) deposited by ion-beam sputtering were investigated. Refractive-index dispersions, bandgaps, and volumetric fractions of materials in mixed coatings were analyzed from spectrophotometric data. Optical scattering, surface roughness, nanostructure, and optical resistance were also studied. Zirconia– silica mixtures experience the transition from crystalline to amorphous phase by increasing the content of ${\mathrm{SiO}}_2$ . This also results in reduced surface roughness. All niobia and silica coatings and their mixtures were amorphous. The obtained laser-induced damage thresholds in the subpicosecond range also correlates with respect to the silica content in both zirconia– and niobia–silica mixtures.

© 2011 Optical Society of America

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