Two micron tellurite fibre lasers

In this talk, the author will describe the recent work in developing RE-doped tellurite fibre lasers emitting in the 2 μm spectral region. Tellurite fibres were fabricated which were doped with Tm³⁺ and Ho³⁺ for emission at ~1.9 μm and -2.1 μm, respectively. Yb³⁺/Tm³⁺ and Tm³⁺/Ho³⁺ co-doping was used to improve the overlap of the absorption spectrum of the fibres with the emission from various pump sources. Similarly, a novel triple doping (Yb³⁺/Tm³⁺/Ho³⁺) scheme was used to improve the efficiency of a Ho³⁺ doped tellurite fibre laser emitting at 2.1 μm when pumped at 1.1 μm. The important energy transfer processes in this triply-doped system are shown in the energy level diagram as shown in the paper.