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Abstract: A new family of Tellurium-based glasses GeTe4–Ga2Te3–AgX (X=I/Br/Cl) has been investigated and the glass-forming region was determined. Properties measurements include XRD, DTA, vis-NIR, and IR transmission spectra. The amorphous nature of the glasses has been proved by X-ray diffraction. Among the three systems, the GeTe4–Ga2Te3–AgI glass system shows superior glass-forming ability and thermal stability. The maximum value of ΔT (= T x − T g) lies at about 110°C for the glass composition 60GeTe4–2-20Ga2Te3–20AgI, while for 60GeTe4–20Ga2Te3–20AgBr and 60GeTe4–20Ga2Te3–20AgCl, the ΔT values are both only 88°C. Most of the studied glasses have a wide optical transmission window from 1.8 to 25μm. [ABSTRACT FROM AUTHOR]

Abstract: Phase locking and mode shaping in multicore Ge20Sb15S65 chalcogenide photonic crystal fibers are proposed and demonstrated. By manipulating the geometrical structure of the fibers, a large mode area of 1962µm2 resulting from in-phase supermodes and equal amplitudes was obtained, which can significantly reduce the nonlinear damage in chalcogenide fibers in the infrared spectrum. With the coherent beam combining technology of multicore photonic crystal fibers, the far-field combining beam exhibits high brightness and high beam quality. Calculations show that with good phase locking and mode shaping, a seven-core photonic crystal fiber can achieve 49 times enhanced intensity compared with single-core fibers. [Copyright &y& Elsevier]