Abstract
The primary excited state decay processes relating to the5I6→5I7∼ 2.9 m laser transition in singly Ho3-doped tellurite (TZBG) glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the5I6energy level at 1151 nm and5I7energy level at 1958 nm has established that the rate of energy transfer up-conversion between holmium ions excited to the5I7level is negligible for Ho3concentrations up to 4 mol. Excited state absorption was not observed from either the5I7or5I6levels and the luminescence from the5I7and5I6energy levels was measured to peak at ∼2050 nm and ∼2930 nm, respectively. The5I6level has a low luminescence efficiency of ∼8.9 due to strong nonradiative multiphonon relaxation. In contrast, decay from the5I7level is essentially fully radiative. A linear decrease in the decay time of the5I6level with Ho3concentration augmentation results from energy transfer to OH-ions in the glass (with NOH∼ 8.2 1017ions cm-3) and reduces the luminescence efficiency of the5I6level to 8 for [Ho3] 4 mol. Numerical simulation of a fiber laser incorporating 4 mol. Ho3showed that a population inversion of ∼7.8 is reached for square pulses of 100 s duration and a repetition frequency of 20 Hz at a moderate pump intensity of 418 kW cm-2if energy transfer to OH-radicals is neglected.
| Language | English |
|---|---|
| Article number | 103110 |
| Pages | 1-6 |
| Number of pages | 6 |
| Journal | Journal of Applied Physics |
| Volume | 109 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 15 May 2011 |
| Externally published | Yes |
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Energy level decay processes in Ho3-doped tellurite glass relevant to the 3 μm transition. / Gomes, Laércio; Milanese, Daniel; Lousteau, Joris; Boetti, Nadia; Jackson, Stuart D.
In: Journal of Applied Physics, Vol. 109, No. 10, 103110, 15.05.2011, p. 1-6.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Energy level decay processes in Ho3-doped tellurite glass relevant to the 3 μm transition
AU - Gomes, Laércio
AU - Milanese, Daniel
AU - Lousteau, Joris
AU - Boetti, Nadia
AU - Jackson, Stuart D.
PY - 2011/5/15
Y1 - 2011/5/15
N2 - The primary excited state decay processes relating to the5I6→5I7∼ 2.9 m laser transition in singly Ho3-doped tellurite (TZBG) glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the5I6energy level at 1151 nm and5I7energy level at 1958 nm has established that the rate of energy transfer up-conversion between holmium ions excited to the5I7level is negligible for Ho3concentrations up to 4 mol. Excited state absorption was not observed from either the5I7or5I6levels and the luminescence from the5I7and5I6energy levels was measured to peak at ∼2050 nm and ∼2930 nm, respectively. The5I6level has a low luminescence efficiency of ∼8.9 due to strong nonradiative multiphonon relaxation. In contrast, decay from the5I7level is essentially fully radiative. A linear decrease in the decay time of the5I6level with Ho3concentration augmentation results from energy transfer to OH-ions in the glass (with NOH∼ 8.2 1017ions cm-3) and reduces the luminescence efficiency of the5I6level to 8 for [Ho3] 4 mol. Numerical simulation of a fiber laser incorporating 4 mol. Ho3showed that a population inversion of ∼7.8 is reached for square pulses of 100 s duration and a repetition frequency of 20 Hz at a moderate pump intensity of 418 kW cm-2if energy transfer to OH-radicals is neglected.
AB - The primary excited state decay processes relating to the5I6→5I7∼ 2.9 m laser transition in singly Ho3-doped tellurite (TZBG) glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the5I6energy level at 1151 nm and5I7energy level at 1958 nm has established that the rate of energy transfer up-conversion between holmium ions excited to the5I7level is negligible for Ho3concentrations up to 4 mol. Excited state absorption was not observed from either the5I7or5I6levels and the luminescence from the5I7and5I6energy levels was measured to peak at ∼2050 nm and ∼2930 nm, respectively. The5I6level has a low luminescence efficiency of ∼8.9 due to strong nonradiative multiphonon relaxation. In contrast, decay from the5I7level is essentially fully radiative. A linear decrease in the decay time of the5I6level with Ho3concentration augmentation results from energy transfer to OH-ions in the glass (with NOH∼ 8.2 1017ions cm-3) and reduces the luminescence efficiency of the5I6level to 8 for [Ho3] 4 mol. Numerical simulation of a fiber laser incorporating 4 mol. Ho3showed that a population inversion of ∼7.8 is reached for square pulses of 100 s duration and a repetition frequency of 20 Hz at a moderate pump intensity of 418 kW cm-2if energy transfer to OH-radicals is neglected.
UR - http://www.scopus.com/inward/record.url?scp=84965179189&partnerID=8YFLogxK
U2 - 10.1063/1.3587476
DO - 10.1063/1.3587476
M3 - Article
VL - 109
SP - 1
EP - 6
JO - Journal of Applied Physics
T2 - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 10
M1 - 103110
ER -