TeO2-BaO-Bi2O3 tellurite optical glasses II. -- Linear and non-linear optical and magneto-optical properties

TL;DR

This study explores the linear, non-linear, and magneto-optical properties of TeO2-BaO-Bi2O3 glasses, revealing their potential for optical device applications due to high refractive indices and Verdet constants across a broad composition range.

Contribution

It provides comprehensive characterization of TeO2-BaO-Bi2O3 glasses, including their optical and magneto-optical properties, and compares them with similar glass systems, offering insights for dispersion engineering.

Findings

High linear and non-linear refractive indices observed.

Introduction of Bi2O3 enhances optical and magneto-optical properties.

Spectral dispersion analysis enables precise modeling of magneto-optic response.

Abstract

The present study investigates the linear and non-linear optical and magneto-optical properties of TeO$_2$-BaO-Bi$_2$O$_3$ (TeBaBi) glasses prepared by the conventional melt-quenching technique at 900 {\deg}C. Prepared glass composition ranges across the whole glass-forming-ability (GFA) region focusing on mutual substitution trends of constituent oxides, where TeO$_2$: 55-85 mol.%, BaO: 10-35 mol.%, Bi$_2$O$_3$: 5-15 mol.%. Studied glasses exhibit high values of linear ($n_{632} \approx$ 1.922-2.084) and non-linear refractive index ($n_2\approx$1.63-3.45$\times10^{-11}$ esu), Verdet constant ($V_{632} \approx$ 26.7-45.3 radT$^{-1}$m$^{-1}$) and optical band gap energy ($E_g \approx$ 3.1-3.6 eV). The introduction of TeO$_2$ and Bi$_2$O$_3$ results in increase of both linear/non-linear refractive index and Verdet constant, with a more pronounced influence of Bi$_2$O$_3$. Measured spectral dispersion of refractive index and Verdet constant were used for estimation of magneto-optic anomaly parameter ($\gamma \approx$ 0.71-0.92), which may be used for theoretical modelling of magneto-optic response in diamagnetic TeBaBi glasses. Additionally, the properties of the prepared TeBaBi glasses were directly compared to those of the TeO$_2$-ZnO-BaO glass system, which was prepared and characterized under similar experimental conditions. The compositional dependence of the refractive index in both glass systems was described using multilinear regression analysis, demonstrating high correlation and uniformity of estimation across the entire GFA region. This makes them highly promising for precise dispersion engineering and construction of optical devices operating from visible to mid-infrared spectral region.