INFRARED COATING STUDIES.
Quarterly rept. no. 10, 14 Sep-14 Dec 65,
BAUSCH AND LOMB INC ROCHESTER N Y RESEARCH AND DEVELOPMENT DIV
Pagination or Media Count:
An investigation was made of the reststrahlen properties of MgO films prepared under various conditions of evaporations. The results not only opened up the possibility of making infrared reflection-type filters with practically no restrictions to the plate size, but also the making of transmission interference filters using reststrahlen film materials in the wavelength range beyond 20 microns. Highly oriented polycrystalline films of MgO were prepared. The reststrahlen reflectivity of such films were described by the Lorentzian dispersion theory with only slight modifications to the parameters used to describe the bulk MgO crystals. Calculations of the enhancements of MgO films were made. Discussions and results of the study are presented in the following sections. Also included in this report are some data of the complex index of refraction of ZnTe film in the region of wavelength about 3 microns. As the films are slightly absorbing, both T and R were measured for the determination of n and k.
- Coatings, Colorants and Finishes