An Interferometric Method for the Determination of the Absorption Coefficients of Metals, with Results for Silver and Aluminum*
- 1 December 1951
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America
- Vol. 41 (12), 1047-1051
- https://doi.org/10.1364/josa.41.001047
Abstract
An interferometric method is described for determining the absorption coefficients of metals from the change in phase accompanying the reflection of light at normal incidence. The reflecting layers in an interference filter are made of the metal being studied. From the optical thickness of the dielectric between the reflecting layers and the wavelength of the light transmitted, the phase change can be calculated. A monocromatic light source is not required, and with photographic methods it is possible to extend the measurements beyond the visible region. Results are given for silver and aluminum in the wavelength range of 3600A to 8100A. For aluminum the index of refraction is also given for this range. It was found that the dispersion of evaporated films of MgF2 increased with thickness. An interferometric method is described for studying the rate of growth of corrosion layers on films which have been exposed to air. Silver films could be exposed without any apparent corrosion. The oxide layer on aluminum films reached a maximum thickness of about 45A.Keywords
This publication has 7 references indexed in Scilit:
- The Effect of Phase Changes in White Light InterferometryJournal of the Optical Society of America, 1951
- An Experimental Study of the Change in Phase Accompanying Reflection of Light from Thin Evaporated FilmsJournal of the Optical Society of America, 1950
- An Interferometric Method for Accurate Thickness Measurements of Thin Evaporated FilmsJournal of the Optical Society of America, 1950
- The Structure of Evaporated Metal Films and Their Optical PropertiesJournal of the Optical Society of America, 1950
- The Structure and Growth of Evaporation LiF and NaCl Films on Amorphous SubstratesThe Journal of Chemical Physics, 1949
- On the Preparation of Hard Oxide Films with Precisely Controlled Thickness on Evaporated Aluminum Mirrors*Journal of the Optical Society of America, 1949
- Dispersion einiger Metalle, besonders für ultraviolette StrahlungAnnalen der Physik, 1903