Research on the optical properties of collodion film

This paper centers on the deposition process and optical properties of collodion film. Collodion film was prepared on the double side polished silicon and k9 optical glass using the sol–gel method. The studying results have showed four characteristics of collodion film. First of all, the thickness of collodion film decreases with increasing the revolution speed. Secondly, the refractive index of collodion film changes from 1.529306 to 1.500128, which accords with the normal dispersion. Thirdly, the transmittance of collodion film is higher in the visible wavelength range 380–760 nm and its average transmittance is 91.9%. At last, the absorption property is very well in the infrared region. The infrared absorption coefficient is greater than 0.69/μm in range of 3–5 μm, and it is up to 1.433528/μm in 8–14 μm because of its many strong infrared absorption peaks. In addition, the absorption characteristics have been analyzed in detail.