Frequency upconversion involving triads and quartets of ions in a Pr3+/Nd3+ codoped fluoroindate glass
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Data
2002-09-15
Autores
Falcão-Filho, Edilson L.
Araújo, Cid B. de
Messaddeq, Younes [UNESP]
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Resumo
Frequency upconversion (UC) processes involving energy transfer (ET) among Nd 3+ and Pr 3+ ions in a fluoroindate glass are reported. In a first experiment, the excitation of Pr 3+ [transition 3H 4→ 1D 2] and of Nd 3+ [transition 4I 9/2→( 2G 7/2+ 4G 5/2)] was achieved with a dye laser operating in the 575-590 nm range. In a second experiment, the Nd 3+ ions were excited with the second harmonic of a Nd: YAG laser at 532 nm. The ET processes leading to UC in both experiments were studied by monitoring the blue fluorescence decay at 480 nm due to the transition 3P 0→ 3H 4 in Pr 3+. In the more relevant UC process, quartets of ions (Nd-Nd-Pr-Pr) are excited due to absorption of three laser photons by two Nd 3+ ions which transfer their energy to two Pr 3+ ions. Each Pr 3+ ion promoted to the 3P 0 level decays to the ground state emitting one photon in the blue region. This conclusion was achieved investigating the dependence of the UC fluorescence intensity as a function of laser intensity, samples concentrations, and temporal behavior of the UC signal. Other UC processes involving nonisoionic groups of three ions are also reported. © 2002 American Institute of Physics.
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Palavras-chave
Blue fluorescence, Co-doped, ET process, Fluorescence intensities, Fluoroindate glass, Frequency up-conversion, Laser intensities, Laser photons, ND : YAG lasers, Second harmonics, Temporal behavior, Dye lasers, Energy transfer, Experiments, Glass, High energy physics, Neodymium, Neodymium lasers, Photons, Ions
Como citar
Journal of Applied Physics, v. 92, n. 6, p. 3065-3070, 2002.