用高温熔融法制备了Bi、Tm、Bi/Tm掺杂TiO2-BaO-SiO2-Ga2O3玻璃系统.在808 nm激光激发下,与Tm单掺杂玻璃相比,Bi/Tm共掺玻璃中Tm3+的3H4→3F4跃迁荧光(～1485 nm)得到了显著的增强,而Tm3+的3F4→3H6跃迁荧光(～1810 nm)减弱.在980nm激光激发下,Tm单掺玻璃中没有观察到Tm离子的特征发光,而在Bi/Tm共掺玻璃中观察到Tm3+的3F4→3H6跃迁荧光(～1810 nm).这是由于在808和980 nm激光二极管(LD)各自激发下,Bi/Tm共掺玻璃中活性Bi离子的近红外发光能量传递给Tm3+,分别产生3F4→3H4与3H6→3H5跃迁所致.采用Inokuti-Hirayama模型,分析了该玻璃体系中Bi→Tm的能量传递机理.结果表明,Bi→Tm的能量传递属于电偶极-偶极相互作用.
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