Optical properties of Ag- and AgI-doped Ge–Ga–Te far-infrared chalcogenide glasses

Abstract

Te-based glasses are ideal material for life detection and infrared-sensing applications because of their excellent far-infrared properties. In this study, the influence of Ag-and AgIdoped Te-based glasses were discussed. Thermal and optical properties of the prepared glasses were evaluated using X-ray diffraction, differential scanning calorimetry, and Fourier transform infrared spectroscopy. Results show that these glass samples have good amorphous state and thermal stability. However, Ge-GaTe -Ag and Ge-GaTe -AgI glass systems exhibit completely different in optical properties. With an increase of Ag content, the absorption cutoff edge of Ge-GaTe -Ag glass system has a red shift. On the contrary, a blue shift appears in Ge-GaTe -AgI glass system with an increase of AgI content. Moreover, the transmittance of Ge-GaTe -Ag glass system deteriorates while that of Ge-GaTe -AgI glass system ameliorates. All glass samples have wide infrared transmission windows and the far-infrared cutoff wavelengths of these glasses are beyond 25 μm. The main absorption peaks of these glasses are eliminated through a purifying method.

Structural evolution of Ge₂₀Se_80–_<i>x</i>Te_<i>x</i> glass networks and assessment of glass properties by theoretical bandgap

“…其中，f 是对应元素的原子百分比，Eg 为对应元素单质带隙。另一方面，对于玻 璃而言，实际带隙值可以通过吸收光谱的测定而计算，该值也被称为光学带隙 ( opt g E ) ，其与吸收系数(α)可以通过 Tauc 方程相关联 [22,23] ： Te 5 E opt g =1.53…”

A method of determining the refractive index of glasses in wide mid-infrared

“…Their typical transmission ranges are 2-25 μm of the wavelength. Among tellurite glasses, the physical properties of Ga-Ge-Te glasses 1,2) and the glasses with additives [3][4][5][6][7] are investigated because of their good thermal stability. For telluride glasses, the refractive index is one of the most important properties to design optical devices.…”