On the origin of the red emission band from erbium doped fluoride glasses excited with 800 nm
1990; Elsevier BV; Volume: 46; Issue: 5 Linguagem: Inglês
10.1016/0022-2313(90)90049-h
ISSN1872-7883
AutoresE.W.J.L. Oomen, Perrine M. T. le Gall, A.M.A. van Dongen,
Tópico(s)Solid State Laser Technologies
ResumoUpconversion 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 4S32 level to the red emitting 4F92 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 4S32 and the other in the 4I92 state. In this case the red emission intensity depends on (Pex)32.
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