Self-absorption and radiation trapping in Er 3 + -doped TeO 2 -based glasses
2005; Institute of Physics; Volume: 71; Issue: 3 Linguagem: Inglês
10.1209/epl/i2005-10092-4
ISSN1286-4854
AutoresM. Mattarelli, M. Montagna, L. Zampedri, Alessandro Chiasera, Maurizio Ferrari, Giancarlo C. Righini, Luís M. Fortes, M. Clara Gonçalves, Luís F. Santos, Rui M. Almeida,
Tópico(s)Solid State Laser Technologies
ResumoThe 1.5 μm fluorescence shape and lifetime of Er3 + -activated tellurite glasses have been investigated. The measures on bulk system have been compared with those obtained on powders, showing that the self-absorption effect broadens the emission spectrum and lengthens the lifetime. It has been demonstrated that the bandwidth and lifetime measurements depend on the absorption coefficient α(λ) and on the distance d between the focused exciting laser beam and the exit face of a bulk glass sample. The actual emission spectrum has been reconstructed from the α(λ)·d knowledge. Lifetime lengthening cannot be determined from α(λ)·d and, to obtain actual lifetime for highly Er3 + -doped glasses, measurements on powders are required.
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