ANDRE FELIPE HENRIQUES LIBRANTZ

ANDRE FELIPE HENRIQUES LIBRANTZ

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Effects in the population inversion of 3H4 level in Tm, Tm-Tb and Tm- Eu doped germanate glasses for amplifiers applications
2006 - LIBRANTZ, A.F.H.; GOMES, L.; PAIRIER, G.; RIBEIRO, S.J.L.; MESSADDEQ, Y.
Energy transfer rates of KYsub(3)Fsub(10):Yb:Tm:Nd system
2008 - COURROL, LILIA C.; SILVA, HORACIO M. da; LIBRANTZ, ANDRE F.H.; RANIERI, IZILDA M.; BALDOCHI, SONIA L.; GOMES, LAERCIO
Investigation of energy shift of 4fsup(3) and 4fsup(2)5d levels in Nd-doped YLF and LLF crystals
2002 - LIBRANTZ, A.F.H.; GOMES, L.; TARELHO, L.V.G.; RANIERI, I.M.
Investigacao dos processos de excitacao multifotonica da configuracao 4fsup(2)5d nos cristais de LiYFsub(4), LuLiFsub(4) e BaYsub(2)Fsub(8) dopados com neodimio trivalente
2004 - LIBRANTZ, ANDRE F.H.
Estudo comparativo da emissoes do Nd(3+) nas configuracoes 4fsup(2)5d e 4fsup(3) induzidas pela excitacao multifotonica em cristais de YLF, GLF, LLF
2000 - LIBRANTZ, ANDRE F.H.
Efeitos da interferencia eletromagnetica em aeronaves causados por dispositivos eletronicos portateis (PEDs)
2006 - LIBRANTZ, ANDRE F.H.; LIBRANTZ, HELIO
Visao e inteligencia computacionais aplicadas a navegacao autonoma de robos
2006 - ARAUJO, SIDNEI A. de; LIBRANTZ, ANDRE F.H.
Tm and Tm-Tb-doped germanate glasses for S-band amplifiers
2008 - LIBRANTZ, A.F.H.; GOMES, L.; PAIRIER, G.; RIBEIRO, S.J.L.; MESSADDEQ, Y.
Growth and characterization of LiYFsub(4):Nd single crystal fibres for optical applications
2006 - ESPIRITO SANTO, A.M.; LIBRANTZ, A.F.H.; GOMES, L.; PIZANI, P.S.; RANIERI, I.M.; VIEIRA JUNIOR, N.D.; BALDOCHI, S.L.
Luminescence study of the 4fsup(2)5d configuration of Ndsup(3+) in LiYFsub(4), LiLuFsub(4) and BaYsub(2)Fsub(8) crystals
2006 - LIBRANTZ, ANDRE F.H.; GOMES, LAERCIO; BALDOCHI, SONIA L.; RANIERI, IZILDA M.; BRITO, G.E.
Ultraviolet fluorescence of Nd3+ ions induced by triphotonic excitation process was studied in Nd-doped LiYF4, LiLuF4 and BaY2F8 crystals using a technique of time-resolved spectroscopy. The observed ultraviolet luminescence was due to transitions between the bottom of 4f 2 5d configuration and 4f 3 states of Nd3+ ions. Narrow emission lines superposed to the broadband emissions were observed. A detailed analysis of luminescence spectrum revealed that the narrow emissions are due to parity and spin allowed radiative transitions from the Stark levels of 4 K11/2(5d) state created by the electrostatic interaction between the 5d electron and the two electrons of the 4f 2 configuration. The narrow emissions are related to the high spin state (S ¼ 3=2) which gives f–f characteristics to the f–d broadband emissions. The narrow emissions superposed to the wide emission correspond to 18%, 34% and 43% of the integrated broadband emission at 262 nm observed in LiYF4, LiLuF4 and BaY2F8 crystals, respectively. Although the 5d–4f 2 interaction is observed to be weaker than 5d-crystal field interaction, it is stronger enough to select only the radiative transitions from 4f 2 5d configuration to 4f 3 states that preserves the total spin S ¼ 3=2.