Dy3+ doped GaGeSbSe fiber long-wave infrared emission

We report on the mid-wave infrared (MWIR) and long-wave infrared (LWIR) emissions of a 1000 ppm Dy3+ doped Ga5Ge20Sb10Se65 chalcogenide fiber. Following a short-wave infrared (SWIR) optical pumping at 0.92, 1.12 and 1.32 μm using commercial laser diodes, LWIR luminescence around 7.3 μm (6H7/2 → 6H9/2 transition) was recorded for the first time to the best of our knowledge along with MWIR emissions around 4.3 μm and 5.4 μm with a Dy3+ doped Ga5Ge20Sb10Se65 fiber. Frequency dependent spectroscopic investigation clearly shows that this LWIR luminescence originates from the 6H7/2 manifold. Spectroscopic properties of this Dy3+ doped material and the comparison with its equivalent sulfide Dy3+:Ga5Ge20Sb10S65 glass are presented. •Dy3+ doped chalcogenide glasses.•Infrared spectroscopy.•Rare-earth LWIR luminescence in selenide based glasses.•Comparative study with respect to the equivalent sulfide glass.