Volume 71, Number 3, August 2005
|Page(s)||394 - 399|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||06 July 2005|
Self-absorption and radiation trapping in -doped -based glasses
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
Corresponding author: email@example.com
Accepted: 1 June 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.
PACS: 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
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