Aging of evaporated MgF2 described by a various number of parameters

Aarne Kasikov; Anatoli S. Kuznetsov

doi:10.1117/12.266543

4 February 1997 Aging of evaporated MgF₂ described by a various number of parameters

Aarne Kasikov, Anatoli S. Kuznetsov

Proceedings Volume 2967, Optical Inorganic Dielectric Materials and Devices; (1997) https://doi.org/10.1117/12.266543
Event: International Conference on Advanced Optical Materials and Devices, 1996, Riga, Latvia

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.

Citation Download Citation

Aarne Kasikov and Anatoli S. Kuznetsov "Aging of evaporated MgF₂ described by a various number of parameters", Proc. SPIE 2967, Optical Inorganic Dielectric Materials and Devices, (4 February 1997); https://doi.org/10.1117/12.266543

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