Nikonorov N, Przhevuskii A, Prassas M, Jacob D
Corning Scientific Center, 4 Birzhevaya Liniya, 199034 St. Petersburg, Russia.
Appl Opt. 1999 Oct 20;38(30):6284-91. doi: 10.1364/ao.38.006284.
A new experimental method for direct determination of the upconversion coefficient C(up) in Er-doped glasses is presented. This method is based on measurement of the dependence on pump power of the fluorescence quantum yield at 1.54 microm and of the excited-state absorption. Two methods are used for determination of the population of the excited Er ions. The first is based on the measurement of the variation in stimulated emission and on the variation in ground-state absorption for the (4)I(15/2)<-->(4)I(13/2) transition range. In the second, the excited-state absorption is measured for the (4)I(13/2) -->(4)F(7/2) transition. This method is successfully applied to Er-doped silicate glass fibers. The value of C(up) experimentally obtained is in good agreement with previously published results.
提出了一种直接测定掺铒玻璃中转换系数C(up)的新实验方法。该方法基于测量1.54微米处荧光量子产率和激发态吸收对泵浦功率的依赖性。采用两种方法测定激发态铒离子的数量。第一种方法基于测量(4)I(15/2)<-->(4)I(13/2)跃迁范围内受激发射的变化和基态吸收的变化。第二种方法是测量(4)I(13/2) -->(4)F(7/2)跃迁的激发态吸收。该方法已成功应用于掺铒硅酸盐玻璃纤维。实验获得的C(up)值与先前发表的结果吻合良好。
