Energy transfer and energy level decay processes in Tm{sup 3+}-doped tellurite glass

Journal Article · Thu Mar 15 00:00:00 EDT 2012 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3694747· OSTI ID:22036823

Gomes, Laercio ^[1]; Lousteau, Joris; Milanese, Daniel; Scarpignato, Gerardo C ^[2]; Jackson, Stuart D ^[3]

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1. Instituto de Pesquisas Energeticas e Nucleares, Centro de Lasers e Aplicacoes, P.O. Box 11049, Sao Paulo, SP 05422-970 (Brazil)
2. PhotonLab, Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino (Italy)
3. Institute of Photonics and Optical Science, School of Physics, University of Sydney, Camperdown, 2006 (Australia)

The primary excited state decay and energy transfer processes in singly Tm{sup 3+}-doped TeO{sub 2}:ZnO:Bi{sub 2}O{sub 3}:GeO{sub 2} (TZBG) glass relating to the {sup 3}F{sub 4}{yields}{sup 3}H{sub 6}{approx}1.85 {mu}m laser transition have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the {sup 3}H{sub 4} manifold at 794 nm, the {sup 3}H{sub 5} manifold at 1220 nm, and {sup 3}F{sub 4} manifold at 1760 nm has established that the {sup 3}H{sub 5} manifold is entirely quenched by multiphonon relaxation in tellurite glass. The luminescence from the {sup 3}H{sub 4} manifold with an emission peak at 1465 nm suffers strong suppression due to cross relaxation that populates the {sup 3}F{sub 4} level with a near quadratic dependence on the Tm{sup 3+} concentration. The {sup 3}F{sub 4} lifetime becomes longer as the Tm{sup 3+} concentration increases due to energy migration and decreases to 2.92 ms when [Tm{sup 3+}] = 4 mol. % as a result of quasi-resonant energy transfer to free OH{sup -} radicals present in the glass at concentrations between 1 x 10{sup 18} cm{sup -3} and 2 x 10{sup 18} cm{sup -3}. Judd-Ofelt theory in conjunction with absorption measurements were used to obtain the radiative lifetimes and branching ratios of the energy levels located below 25 000 cm{sup -1}. The spectroscopic parameters, the cross relaxation and Tm{sup 3+}({sup 3}F{sub 4}) {yields} OH{sup -} energy transfer rates were used in a numerical model for laser transitions emitting at 2335 nm and 1865 nm.

• OSTI ID: 22036823
• Journal Information: Journal of Applied Physics, Vol. 111, Issue 6; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
BISMUTH OXIDES
DOPED MATERIALS
ENERGY TRANSFER
EXCITATION
EXCITED STATES
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
GERMANIUM OXIDES
GLASS
HYDROXYL RADICALS
LIFETIME
PHONONS
RELAXATION
TELLURIUM OXIDES
THULIUM IONS
TIME RESOLUTION
ZINC OXIDES