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Application of the Tauc-Lorentz formulation to the interband absorption of optical coating materials
Bernhard von Blanckenhagen1, Diana Tonova, Jens Ullmann
1Coating Technology, Central Research and Technology, Carl Zeiss, Oberkochen, Germany. blanckenhagen@zeiss.de
Applied Optics
|June 18, 2002
Abstract:
Recent progress in ellipsometry instrumentation permits precise measurement and characterization of optical coating materials in the deep-UV wavelength range. Dielectric coating materials exhibit their first electronic interband transition in this spectral range. The Tauc-Lorentz model is a powerful tool with which to parameterize interband absorption above the band edge. The application of this model for the parameterization of the optical absorption of TiO2, Ta2O5, HfO2, Al2O3, and LaF3 thin-film materials is described.