Rare-earth doped selenide glasses and fibers for active applications in the near and mid-IR

Abstract Glasses based on the composition Ge 16.5 As 18.5 Ga 0.5 Se 64.5 doped with Pr 3+ and Dy 3+ were investigated for active applications in the near and mid-IR. Pr 3+ has been investigated and mid-IR emission in the 3–5 μm region has been observed. Dynamic distillation and sublimation were performed on Se and As respectively to reduce the oxide and hydrogen related impurities in the glass. These techniques resulted in the elimination of oxide impurities and resulted in about a 10-fold reduction in hydrogen related impurities compared to the as-received chemicals. Spectroscopy performed on Dy 3+ resulted in a measured quantum efficiency for the 6 F 11/2 / 6 H 9/2 level of 94% with a branching ratio of 90% for the 1.3 μm transition and a calculated emission cross section ( σ e ) for this transition of 2.7 × 10 −20 cm 2 . Core only glass doped with 400 ppm Dy 3+ has been fiberized. The losses were 0.8 dB/m at 6 μm and 1.5 dB/m at 2.5 μm as measured by a cutback technique. Single mode Dy 3+ doped fiber has been drawn via double crucible techniques. The fiber had a 4 μm core with a 110 μm clad and had a core loss of 3 dB/m measured at 1.55 μm.

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