ORCID Profile
0000-0002-0868-2726
Current Organisation
Université Laval
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Publisher: AIP Publishing
Date: 15-01-2008
DOI: 10.1063/1.2833436
Abstract: The primary excited state absorption processes relating to the I65→I75 3μm laser transition in singly Ho3+-doped fluoride glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the I65 and I75 energy levels established the occurrence of two excited state absorption transitions from these energy levels that compete with previously described energy transfer upconversion processes. The I75→I45 excited state absorption transition has peak cross sections at 1216nm (σesa=2.8×10−21cm2), 1174nm (σesa=1×10−21cm2), and 1134nm (σesa=7.4×10−22cm2) which have a strong overlap with the I85→I65 ground state absorption. On the other hand, it was established that the excited state absorption transition I65→S25 had a weak overlap with ground state absorption. Using numerical solution of the rate equations, we show that Ho3+-doped fluoride fiber lasers employing pumping at 1100nm rely on excited state absorption from the lowest excited state of Ho3+ to maintain a population inversion and that energy transfer upconversion processes compete detrimentally with the excited state absorption processes in concentrated Ho3+-doped fluoride glass.
Publisher: Elsevier BV
Date: 02-2023
Publisher: OSA
Date: 2018
Publisher: Elsevier BV
Date: 05-2021
Publisher: AIP Publishing
Date: 15-06-2007
DOI: 10.1063/1.2749285
Abstract: The deactivation of the two lowest excited states of Ho3+ was investigated in Ho3+ singly doped and Ho3+, Pr3+-codoped fluoride (ZBLAN) glasses. We establish that 0.1–0.3mol% Pr3+ can efficiently deactivate the first excited (I75) state of Ho3+ while causing a small reduction of ∼40% of the initial population of the second excited (I65) state. The net effect introduced by the Pr3+ ion deactivation of the Ho3+ ion is the fast recovery of the ground state of Ho3+. The Burshstein model parameters relevant to the Ho3+→Pr3+ energy transfer processes were determined using a least squares fit to the measured luminescence decay. The energy transfer upconversion and cross relaxation parameters for 1948, 1151, and 532nm excitations of singly Ho3+-doped ZBLAN were determined. Using the energy transfer rate parameters we determine from the measured luminescence, a rate equation model for 650nm excitation of Ho3+-doped and Ho3+, Pr3+-doped ZBLAN glasses was developed. The rate equations were solved numerically and the population inversion between the I65 and the I75 excited states of Ho3+ was calculated to examine the beneficial effects on the gain associated with Pr3+ codoping.
Publisher: OSA
Date: 2017
Publisher: The Optical Society
Date: 27-09-2017
Location: Brazil
Location: No location found
No related grants have been discovered for Younes Messaddeq.