Fig. 1. Schematic diagram of multistage distillation of Se and Te raw materials

Fig. 2. Schematic diagram of bundles imaging test system

Fig. 3. DSC curves of As₃₀Se₅₀Te₂₀ and As₃₀Se₅₁Te₁₉ glasses

Fig. 4. Infrared absorption spectra of AST glass samples prepared by different processes (The inset shows the infrared transmission spectra of all samples)

Fig. 5. (a) Optical fiber preform; (b) The prepared AST glass fiber; (c) Bending test of the AST fiber; (d) Loss spectrum of AST glass fiber; (e) Energy distribution at the fiber end face

Fig. 6. (a) Micrograph of the coherent fiber bundle; (b) Infrared thermal imaging of the bundle for the planar array black body; (c) Infrared thermal imaging of the bundle for the infrared target