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A step-index chalcogenide fiber with a rectangular core and a circular cladding was fabricated through an approach that combines an extrusion technique and a multiple-stage rod-in-tube method. This fiber has a Ge 12 As 24 Se 64 glass core with a size of ~2.8 μm × 5.9 μm, and a Ge 10 As 24 S 66 glass cladding with a diameter of ~220 μm, and shows a relatively large birefringence. When ~10 cm long fiber was pumped at 4.0 μm with 330 fs pulses, ~2.2–9.5 μm supercontinuum with a flatness of 20 dB and a polarization extinction ratio of ~10 dB was generated. • A chalcogenide glass fiber with a rectangular core is designed. • The fiber is fabricated by an extrusion technique and a rod-in-tube method. • The fiber shows a background loss of about 3.1 dB/m in the mid-infrared. • Polarized ~2.2–9.5 μm supercontinuum is generated in the fiber. [ABSTRACT FROM AUTHOR]

Novel Ga–Sb–S chalcogenide glasses doped with different amount of Dy 3+ ions were prepared. Their thermal stability, optical properties, and mid-infrared (MIR) emission properties were investigated. The glasses show good thermal stability, excellent infrared transparency, very low phonon energy (∼306 cm −1 ), and intense emissions centered at 2.95, 3.59, 4.17 and 4.40 μm. Three Judd–Ofelt intensity parameters (Ω 2 = 8.51 × 10 −20 cm 2 , Ω 4 = 2.09 × 10 −20 cm 2 , and Ω 6 = 1.60 × 10 −20 cm 2 ) are obtained, and the related radiative transition properties are evaluated. The high quantum efficiencies and large stimulated emission cross sections of the MIR emissions (88.10% and 1.11 × 10 −20 cm 2 for 2.95 μm emission, 75.90% and 0.38 × 10 −20 cm 2 for 4.40 μm emission, respectively) in the Dy 3+ -doped Ga–Sb–S glasses make them promising gain materials for the MIR lasers. [ABSTRACT FROM AUTHOR]