Multi-layer thin mirrors were obtained easily by repeating dip coating followed by heat treetment. The condition of the heat treetment was 500°C, 10 minutes.
The mirror is composed of alternative seven layers of the titania and the silica on a quartz-glass substrate.
The phases of the titania and silica were amorphous. The refractive index was 2.1, and 1.45 for titania and silica respectively.
The muximum reflection of incident light of this layered film was 83% and was just the same as its theoretical value. The optical transmission data was in agreement with the spectra simulated by using above indicies.
The wave length of the maximum reflection of the film can be controlled by the thickness of each oxide layer, though controlling the alcoxide concentration of the coating solution at the stage of dip coating.