SURVEY OF TWO-COAT REFLECTION-REDUCING FILMS,
Abstract
A comprehensive study (theoretical and experimental) of two-coat reflection reducing films was made with particular emphasis on the effects of variations of the thicknesses and of the refractive indices of the films on the reflection reducing efficiencies of the coatings. The experimental results were compared with theoretical values calculated through the use of equations developed by Dr. B. Salzberg, relating to the reflection of electromagnetic waves from coated surfaces. Several combinations of films were found to give spectral reflection curves having reflection minima below 0.2% per surface and overall reflections approximately the same as that of the type recommended previously. At this time, no particular advantage would be gained by changing to any of these other combinations of films. No significant increase in effectiveness of these films is possible until a film having an index of refraction appreciably lower than 1.47 is adapted for use with a higher index film. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 15, 1945
- Accession Number
- AD0623524
Entities
People
- L. B. Lockhart Jr.
Organizations
- United States Naval Research Laboratory