980 nm脉冲激发下Er3+掺杂材料中4Ⅰ13/2→4Ⅰ15/2跃迁的瞬态行为

在过去的几十年人们对Er3+掺杂的玻璃材料进行了广泛的研究,因为Er3+的4Ⅰ13/2→4Ⅰ15/2跃迁能够给出适合红外光通讯窗口的1.5 μm的发射.据我们所知,目前关于脉冲激光激发下Er3+掺杂材料1.5 μm发射的动力学行为研究报道仍很少.我们引入了转移函数理论,研究了980nm脉冲激发下Er3+的4Ⅰ13/2能级荧光的动力学行为.发现在980nm脉冲激发后,其荧光衰减遵循双指数规律,4Ⅰ13/2能级布居分为指数上升和指数下降两个过程.

Transient Behavior of the Emission 4Ⅰ13/2 →4Ⅰ15/2 in Er3 + Doped Material under 980 nm-pulsed Excitation

In the last decades, much attention has been paid to the Er3+ doped glass materials since it is widely known that the transition 4Ⅰ13/2→4Ⅰ15/2 of Er3+ can give an emission peaking around 1.5 μm, which matches the IR optical communication window. To our knowledge there are very few of investigations on the dynamics of 1.5 μm emission of Er3 +. The transfer function theory is introduced to investigate transient fluorescent behavior of the transition 4Ⅰ13/2→4Ⅰ15/2 in the Er3+ doped materials under 980 nm-pulsed excitation. A mathematical expression for the temporal emission evolution is given. It is found that after having been excited by 980 nm δ-pulse the luminescence decay of level 4Ⅰ13/2 obeys double exponential function law, and the variation of population of the level 4 Ⅰ13/2 has two stages: rise-stage and set-stage.