1.47, 1.88 and 2.8 μm emissions of Tm3+ and Tm3+-Ho3+-codoped tellurite glasses

Abstract Tellurite glass is a good host for Tm 3+ because of high quantum efficiency and good glass stability. For 1.47 μm the upper limit for Tm 2 O 3 concentration without quenching is 0.4 wt%. For 1.88 μm, it should be 0.4 wt% in order to take advantage of the two-for-one transition.