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Proceedings Paper

Aging of evaporated MgF2 described by a various number of parameters
Author(s): Aarne Kasikov; Anatoli S. Kuznetsov
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Paper Abstract

The MgF2 layers were vacuum evaporated on fused silica substrates using a crystalline and a pressed sintered evaporation materials. The transition spectra of the specimens were recorded in the wavelength range 240 - 830 nm and changes in it monitored during storage of the specimens in atmosphere. The results were analyzed using an envelope method and a fitting of Lorentzian dispersion model with various number of parameters. A rise of the computed indices of refraction and absorption during storing in the air was seen. A heating in vacuum resulted in the temporal descending of refraction and rise of absorption indices. Fitting of the dispersion equation showed a drop of the absorption index moving from 4 to 7 fitting parameters in the red side of the spectra. On the blue side (UV) both indices rose moving from 4 to 5 parameters and descended again at 7 parameters. This shows a need of proper selection of the dispersion model for describing the real coatings. The negative values for the indices of absorption obtained by envelope method displayed the inhomogeneity of the refractive index in the fresh coatings.

Paper Details

Date Published: 4 February 1997
PDF: 5 pages
Proc. SPIE 2967, Optical Inorganic Dielectric Materials and Devices, (4 February 1997); doi: 10.1117/12.266543
Show Author Affiliations
Aarne Kasikov, Institute of Physics (Estonia)
Anatoli S. Kuznetsov, Institute of Physics (Estonia)

Published in SPIE Proceedings Vol. 2967:
Optical Inorganic Dielectric Materials and Devices
Andris Krumins; Donats K. Millers; Andris R. Sternberg; Janis Spigulis, Editor(s)

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