Glass forming and properties of Ga2S3Sb2S3CsCl chalcohalide system

In this work, a new chalcohalide glass system, Ga2S3Sb2S3CsCl (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 Ga2S3Sb2S3 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/cm3, 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 cm2/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.