Room temperature infrared-laser-induced upconversion in Nd³⁺ doped Ta₂O₅ waveguides

Lahoz, F., Martín, I.R., Shepherd, David, Wilkinson, J.S. and Hassan, M.A. (2006) Room temperature infrared-laser-induced upconversion in Nd³⁺ doped Ta₂O₅ waveguides. Chemical Physics Letters, 421 (1-3), 198-204. (doi:10.1016/j.cplett.2006.01.076).

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 ⁴G_7/2 level. Radiative relaxations from this level to the ⁴I_9/2, ⁴I_11/2 and ⁴I_13/2 multiplets produce visible emission bands in the green, orange and red regions. Excited state absorption from the ⁴F_3/2 to the ²P_1/2 state can also occur, giving rise to a blue emission band (²P_1/2 to ⁴I_9/2). A rate equation analyses supports the proposed mechanisms.

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Contributors

Author: David Shepherd

Author: J.S. Wilkinson

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