ON THE ORIGIN OF THE RED EMISSION BAND FROM ERBIUM DOPED FLUORIDE GLASSES EXCITED WITH 800 NM

被引:28
作者
OOMEN, EWJL
LEGALL, PMT
VANDONGEN, AMA
机构
[1] Philips Research Laboratories, 5600 JA Eindhoven
关键词
D O I
10.1016/0022-2313(90)90049-H
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Upconversion of 800 nm excitation in erbium doped fluoride glasses results in a strong green emission and a weak red emission. The origin of the red emission is elucidated. For fluoride glasses with an erbium concentration up to about 1 mol% it originates from the nonradiative relaxation of the green emitting 4S 3 2 level to the red emitting 4F 9 2 level. This results in a quadratic dependence of the red emission intensity on the excitation power, Pex. For glasses with an erbium concentration higher than 1 mol% the population of the red emitting level is mainly due to a cross-relaxation process between two erbium ions; one in the 4S 3 2 and the other in the 4I 9 2 state. In this case the red emission intensity depends on (Pex) 3 2. © 1990.
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页码:353 / 358
页数:6
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