Optical properties of Ho-doped alumino–germano-silica glass optical fiber

We present the optical characteristics of Ho-doped alumino–germano-silica glass fiber prepared by the Modified Chemical Vapor Deposition (MCVD) technique. Strong absorption peaks were observed at 1153 nm, 890 nm, 653 nm and 551 nm and another peak around 1726 nm. A possibility of lasing in the Ho-doped alumino–germano-silica glass fiber is shown by the Judd–Ofelt analysis predicting the multiple visible emissions around 550 nm and 650 nm and near infra red emissions around 1050 nm and beyond 1726 nm.