Role of mobile hydrogen on relaxation processes in Ge-doped optical fibers.

Youcef Ouerdane (1) , Aziz Boukenter (1) , Kader Medjahdi (1) , Fabrizio Messina (2) , Marco Cannas (2)

1 LHC - Laboratoire Hubert Curien
2 Università degli studi di Palermo - University of Palermo

Temperature dependencies of steady-state and time-resolved photoluminescence (PL) from triplet state at 3.1 eV and singlet state at 4.2 eV ascribed to the twofold-coordinated Ge have been measured in unloaded and H2-loaded Ge-doped silica samples under 5.0 eV excitation in the 10K to 310 K range. Experimental evidences indicate that diffusing molecular hydrogen (H2) depopulates by a collisional mechanism the triplet state, decreasing both its lifetime of about 14 % and the associated triplet PL intensity, whereas those of the singlet are insensitive to the presence of H2.

Domaines: Instrumentations et Détecteurs [physics.ins-det]; Science des matériaux [cond-mat.mtrl-sci]

Youcef Ouerdane, Aziz Boukenter, Kader Medjahdi, Fabrizio Messina, Marco Cannas. Role of mobile hydrogen on relaxation processes in Ge-doped optical fibers.. Mondello, Palermo. ⟨ujm-00117497⟩