Self-absorption and radiation trapping in -doped -based glassesM. Mattarelli1, M. Montagna1, L. Zampedri1, A. Chiasera2, M. Ferrari2, G. C. Righini3, L. M. Fortes4, M. C. Gonçalves4, L. F. Santos4 and R. M. Almeida4
1 Dipartimento di Fisica, Università di Trento, GCSMFO Via Sommarive 14, I-38050 Povo, Trento, Italy
2 IFN-CNR, Istituto di Fotonica e Nanotecnologie, GCSMFO Via Sommarive 14, I-38050 Povo, Trento, Italy
3 IFAC-CNR, Istituto di Fisica Applicata "Nello Carrara" Via Panciatichi 64, I-50127 Firenze, Italy
4 Departamento de Engenharia de Materiais, Instituto Superior Técnico A. Rovisco Pais, 1049-001 Lisboa, Portugal
received 13 January 2005; accepted in final form 1 June 2005
published online 6 July 2005
The 1.5 fluorescence shape and lifetime of -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 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 knowledge. Lifetime lengthening cannot be determined from and, to obtain actual lifetime for highly -doped glasses, measurements on powders are required.
42.70.Hj - Laser materials.
78.55.-m - Photoluminescence, properties and materials.
78.40.-q - Absorption and reflection spectra: visible and ultraviolet.
© EDP Sciences 2005