Yb3+/Tm3+双掺硫卤玻璃1.8μm中红外发光特性研究

1.8μm Mid-Infrared Optical Spectra ofYb3+/Tm3+-codoped Chalcogenide Glasses

摘要:

用熔融淬冷法制备了系列不同组分和Yb³⁺/Tm³⁺掺杂浓度的Ge-Ga-Se-CsI硫卤玻璃样品，测试了样品的拉曼光谱、折射率、吸收光谱、红外荧光光谱。研究了975nm激光泵浦下样品的1.23μm和1.8μm荧光特性。分析了Yb³⁺/Tm³⁺之间声子辅助的共振能量转移，结果表明两个离子间有效的能量转移途径为Yb³⁺∶²F_5/2→Tm³⁺∶³H₅。计算得到常温下Tm³⁺∶³H₅→³F₄和Tm³⁺∶³F₄→3H₆跃迁的多声子弛豫速率分别为303s^-1和0.30s^-1。

Abstract:

A serial of chalcohalide glasses based on the composition Ge-Ga-Se-CsI doped with the different Yb³⁺/Tm³⁺ ions concentration were synthesized by melt quenching technique. The refractive indexes, Raman spectra, absorption spectra, infrared fluorescence of the samples were measured. The 1.23μm and 1.8μm fluorescence properties were investigated with different Yb³⁺/Tm³⁺ ion concentrations under 975nm laser excitation. The results show that the effective energy transfer between two rare earth ions are mainly attributed to the resonance energy of phonon assistant absorption from Yb³⁺∶²F_5/2→Tm³⁺∶³H₅。level. The multi-phonon relaxation rates (Wmp) of Tm³⁺∶³H₅→³F₄(1.23μm) andTm³⁺∶³F₄→3H₆(1.8μm) in Ge Ga Se CsI glasses were evaluated to be 303s^-1 and 0.30s^-1 respectively.