Seminar Announcement: Trevor Benson

Data pubblicazione: 5-mar-2019 18.40.11

Announcement

Tuesday, 26 February 2019, 10:30

Sala Grande Palazzina B via alla Cascata 56/C

"Assessing the optical properties of chalcogenide glasses at mid-infrared (MIR) wavelengths"

Trevor Benson

George Green Institute for Electromagnetics Research, Faculty of Engineering,

University of Nottingham, University Park, Nottingham, NG7 2RD,

United Kingdom

E-mail: Trevor.Benson@nottingham.ac.uk

Abstract

Abstract Refractive index dispersion is one of the critical parameters that influences the design of optical components. Prism measurements in our laboratory can determine the mid-infrared refractive index of chalcogenide glasses to a standard deviation of precision of less than 0.002. However, shortcomings of this technique are that it requires multiple light sources and intensive sample preparation. The modelling of transmission spectroscopic data [1] is an attractive alternative and was extended by us into the mid-infrared (MIR) region by introducing a two- term Sellmeier equation [2]. This approach determines the refractive index dispersion of chalcogenide glasses to an accuracy of better than 0.4 %. The presentation we will review this method, and discuss its recent extensions to determining very small refractive index contrast and the evaluation of thermo-optic coefficients.