Reconstruction and modeling of the complex refractive index of nonlinear glasses from terahertz to optical frequencies

The linear complex refractive index of a set of borosilicate and tellurite as well as heavy metal oxide silicate, germanate and fluoride glasses has been determined using the Kramers-Kronig analysis on combined data from terahertz time domain (THz-TD) and Fourier transform infrared (FTIR) spectromet...

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Bibliographic Details
Published in:Optics express 2021-08, Vol.29 (16), p.26191-26209
Main Authors: Pacewicz, Adam, Cimek, Jaroslaw, Salski, Bartlomiej, Walczakowski, Michal, Buczynski, Ryszard
Format: Article
Language:English
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Summary:The linear complex refractive index of a set of borosilicate and tellurite as well as heavy metal oxide silicate, germanate and fluoride glasses has been determined using the Kramers-Kronig analysis on combined data from terahertz time domain (THz-TD) and Fourier transform infrared (FTIR) spectrometers in the ultrabroadband range of 0.15 THz to 200 THz. Debye, Lorentz and shape language modeling (SLM) approaches are applied. Far-infrared absorption power-law model parameters are determined via searching for the largest frequency range that minimizes the root mean squared error (RMSE) of a linear least squares fit for the set of glasses and other glass literature data. Relationships between the absorption parameters, glass properties and compositions are explored.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.431430