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Room temperature infrared-laser-induced upconversion in Nd3+ doped Ta2O5 waveguides
F.Lahoza, I.R.Martína, D.P.Shepherdb, J.S.Wilkinsonb and M.A.Hassanb
a. Departamento Física Fundamental y Experimental, Electrónica y Sistemas, Universidad de La Laguna, C/Astrofísico Francisco Sanchez s/n, E-38206 La Laguna, Tenerife, Spain
b. Optoelectronics Research Centre, University of Southampton, UK
Abstract
The room temperature infrared to visible upconversion properties of Nd3+ doped Ta2O5 rib waveguides deposited on a silica substrate have been investigated in the 720-900 nm excitation range. Two possible upconversion mechanisms exist at different excitation wavelengths. The main one is due to energy transfer upconversion and results in the population of the 4G7/2 level. Radiative relaxations from this level to the 4I9/2, 4I11/2 and 4I13/2 multiplets produce visible emission bands in the green, orange and red regions. Excited state absorption from the 4F3/2 to the 2P1/2 state can also occur, giving rise to a blue emission band (2P1/2 to 4I9/2). A rate equation analyses supports the proposed mechanisms.
Chemical Physics Letters (2006) Vol.421(1-3) pp.198-204
doi: 10.1016/j.cplett.2006.01.076
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Copyright University of Southampton 2006