INFRARED COATING STUDIES.
Abstract
An experimental study was made of the reflectance of thick evaporated films in their reststrahlen regions of the infrared spectrum. Although only a few of the materials studied gave films having an efficient rst reflectance, many of them appeared optically acceptable for use as interference films. These may be as being clear without color and free of turbidity, i.e. designated therein as clear or only slightly scattering (sl. scatter.) They include films showing no cracks in optical thickness up to six microns or more, depending on substrate temperature, of Al2O3, Nd2O3, CaF2, siO2, Ti2O3, MgO, MgF2, LiF, HfO2 and ZrO2. For rst reflectance purposes, e.g. reflection filtering, films of MgO were best, there being no difficulty in obtaining the full reflectance of the parent crystal.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 14, 1966
- Accession Number
- AD0635670
Entities
People
- A. F. Turner
- F. Sulzbach