High quantum efficiency of 1.8 μm luminescence in Tm3+ fluoride tellurite glass
Dingchen Tang, Qingsong Liu, Xiujie Liu, Xu Wang, Xueying Yang, Yongyan Liu, Ying Tian, Renguang Ye, Xianghua Zhang, Shiqing Xu
Abstract
In this paper, Tm 3+ doped fluorotellurite glasses are synthesized by melt-quenching technique. The thermal and spectral properties of the glasses are characterized. The effect of the 1.8 μm emission properties for different Tm 3+ concentrations are investigated. ΔT (153 ℃) of the glass indicates it has good thermal stability . Spectroscopic parameters of Tm 3+ such as radiative transition probability, branching ratio, spectroscopic quality factor, integrated emission cross section and radiative lifetime are calculated on the basis of Judd-Ofelt analysis. The maximum half-height width corresponding to 1.8 µm broadens as Tm 3+ increases and reaches a maximum of 216 nm, as well as the longer lifetime (5.68 ms). For 1.8 µm ( 3 F 4 → 3 H 6 ) emission band, the calculated Tm 3+ doped fluorotellurite glass has a high quantum efficiency of 75.93%. Furthermore, the theoretical analysis of the energy transfer mechanism between Tm 3+ ions were represented. Therefore, these results demonstrate that prepared Tm 3+ doped fluorotellurite glass is an ideal laser material for 1.8 µm band solid-state laser applications.