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In this work, environment friendly Ga‐Sb‐S‐I chalcohalide glasses and fibers are developed for mid‐infrared applications. The developed Ga8Sb32S60‐xIx (x = 0‐10) glasses have a transmission window of ~0.7‐14 µm, linear refractive indices (n0) of ~ 2.690‐2.751 at 1.55 µm, nonlinear refractive indices (n2) of ~10.5‐12.4 × 10−14 cm2/W at 1.55 µm, and zero dispersion wavelengths (λ0) of ~4.94‐5.25 µm. The developed Ga8Sb32S55I5/Ga8Sb31S56I5 (core/cladding) fiber can transmit infrared light from below 2 µm to ~8 µm, and shows the minimum loss of ~1.2 dB/m at ~6 µm. The wide transmission window, high optical nonlinearity and superior thermal stability against crystallization of the glasses, and the good 2‐8 µm transmission property of the fiber make these materials promising for mid‐infrared applications such as thermal imaging, nonlinear optics, and laser transmission. [ABSTRACT FROM AUTHOR]

Properties of the glasses are experimentally investigated when Ga is gradually substituted by Ge in Ga 8 Sb 32 S 60 chalcogenide glass. The glass structure is also studied to elucidate the variations of the properties. While the substitution of Ga by Ge does not remarkably change the glass transition temperature T g , the thermal stability against crystallization becomes optimum when half of the Ga atoms are replaced by Ge atoms. The short-wavelength absorption edge λ S (or optical bandgap E g ) exhibits a remarkable decrease when a small amount of Ge is added, however, its value does not change significantly with further Ga substitution. As Ga is gradually replaced by Ge, the long-wavelength cut-off edge λ L , the density ρ , the linear refractive index n , and the third-order nonlinear refractive index n 2 decrease. It is shown that the property variations of the glasses could be explained by the evolution of the glass structure. [ABSTRACT FROM AUTHOR]

In this work, a new chalcohalide glass system, Ga 2 S 3 Sb 2 S 3 CsCl (GSSC), is reported. The glass-forming ability and the physical properties are investigated; and the potential applications of these glasses are evaluated. The glass forming ability can be remarkably improved when CsCl is added into Ga 2 S 3 Sb 2 S 3 glasses, and the compositions with more than 30% CsCl possess quite good thermal stability against crystallization. The studied GSSC glasses have transition temperatures of 217–250 °C, densities of 3.42–3.97 g/cm 3 , micro-hardness of 1.12–1.88 GPa, a transparent window of ∼0.56–13.4 μm, linear refractive indices of 1.99–2.58 @ 10 μm, nonlinear refractive indices of 1.1–11.9 × 10 −14 cm 2 /W @ 1030 nm, and zero group-velocity-dispersion wavelengths of 3.37–5.15 μm. The wide transparent window and the superior optical nonlinear property make these glasses good optical materials for infrared imaging and nonlinear photonics. [ABSTRACT FROM AUTHOR]