A broad look into the spectroscopy of GaLaS chalcogenide glass doped with Nd3+
A broad look into the spectroscopy of GaLaS chalcogenide glass doped with Nd3+
Interesting characteristics such as low phonon energy, large refractive index, transparency in the near and mid infrared and high covalence in bonding make chalcogenide glasses very attractive materials for rare earth (RE) doped lasers and optical amplifiers. Moreover, these glasses present a photodarkening effect that allows their application as planar waveguides and gratings. Laser action has already been observed in GaLaS: Nd3+ glass in the bulk and fiber forms and the presence of structural defects and their possible influence on the quantum efficiency of Nd3+ at the laser transition in 1.08 µm (4F3/2 to 4I11/2) has been investigated by a combination of thermal and optical spectroscopic measurements.
Aiming to extend the studies on the host-ion interactions and to characterize ion-ion energy transfer processes that could result in losses for the laser emission, this work presents novel spectroscopic results and the calculations of energy transfer probabilities from Nd3+ level 4F3/2 using Dexter and Kushida model of multipolar interactions. Absorption, excitation and fluorescence measurements in the visible and infrared regions reveal interesting characteristics of energy transfer from the host to the ion and also ion-host back transfer. In the near infrared region site selective spectroscopic results point out the presence of different Nd3+ sites and lifetime measurements of level 4F3/2 were done as a function of doping concentration. The values of the microscopic energy transfer parameters Cda associated to the cross relaxation 4F3/2, 4I9/2 to 4I15/2, 4I15/2 and Cdd associated to the energy migration 4F3/2, 4I9/2 to 4F3/2, 4I9/2 obtained by Dexter and Kushida models are in very good agreement.
De Camargo, A.S.S.
26fb83ef-db35-4b9d-8d7f-218cc4d09ea3
Nunes, L.A.de Oliveira
6edba704-48dd-4b8a-8a19-dcfee971191b
Lima, S.M.
812be72f-4727-4840-a24e-9290494b2312
Catunda, T.
e7766980-832d-4681-a215-95def8fe3e00
Hewak, D.
87c80070-c101-4f7a-914f-4cc3131e3db0
De Camargo, A.S.S.
26fb83ef-db35-4b9d-8d7f-218cc4d09ea3
Nunes, L.A.de Oliveira
6edba704-48dd-4b8a-8a19-dcfee971191b
Lima, S.M.
812be72f-4727-4840-a24e-9290494b2312
Catunda, T.
e7766980-832d-4681-a215-95def8fe3e00
Hewak, D.
87c80070-c101-4f7a-914f-4cc3131e3db0
De Camargo, A.S.S., Nunes, L.A.de Oliveira, Lima, S.M., Catunda, T. and Hewak, D.
(2002)
A broad look into the spectroscopy of GaLaS chalcogenide glass doped with Nd3+.
XXV Encontro Nacional de Fisica da Materia Condensa, Brazil.
06 - 09 May 2002.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Interesting characteristics such as low phonon energy, large refractive index, transparency in the near and mid infrared and high covalence in bonding make chalcogenide glasses very attractive materials for rare earth (RE) doped lasers and optical amplifiers. Moreover, these glasses present a photodarkening effect that allows their application as planar waveguides and gratings. Laser action has already been observed in GaLaS: Nd3+ glass in the bulk and fiber forms and the presence of structural defects and their possible influence on the quantum efficiency of Nd3+ at the laser transition in 1.08 µm (4F3/2 to 4I11/2) has been investigated by a combination of thermal and optical spectroscopic measurements.
Aiming to extend the studies on the host-ion interactions and to characterize ion-ion energy transfer processes that could result in losses for the laser emission, this work presents novel spectroscopic results and the calculations of energy transfer probabilities from Nd3+ level 4F3/2 using Dexter and Kushida model of multipolar interactions. Absorption, excitation and fluorescence measurements in the visible and infrared regions reveal interesting characteristics of energy transfer from the host to the ion and also ion-host back transfer. In the near infrared region site selective spectroscopic results point out the presence of different Nd3+ sites and lifetime measurements of level 4F3/2 were done as a function of doping concentration. The values of the microscopic energy transfer parameters Cda associated to the cross relaxation 4F3/2, 4I9/2 to 4I15/2, 4I15/2 and Cdd associated to the energy migration 4F3/2, 4I9/2 to 4F3/2, 4I9/2 obtained by Dexter and Kushida models are in very good agreement.
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e-pub ahead of print date: 2002
Venue - Dates:
XXV Encontro Nacional de Fisica da Materia Condensa, Brazil, 2002-05-06 - 2002-05-09
Identifiers
Local EPrints ID: 16994
URI: http://eprints.soton.ac.uk/id/eprint/16994
PURE UUID: bfa0dba7-3398-46e5-9402-00e2903306aa
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Date deposited: 16 Aug 2005
Last modified: 12 Dec 2021 02:47
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Contributors
Author:
A.S.S. De Camargo
Author:
L.A.de Oliveira Nunes
Author:
S.M. Lima
Author:
T. Catunda
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