Mid-IR luminescence of Dy~(3+) and Pr~(3+) doped Ga_5Ge_(20)Sb_(10)S(Se)_(65) bulk glasses and fibers

摘要

Dy~(3+) and Pr~(3+) doped Ga_5Ge_(20)Sb_(10)S(Se)_(65) glasses provide good emission efficiencies in the mid-infrared (mid-IR). The complex glassy network of these chalcogenide glasses were characterized by Raman scattering and extended X-ray absorption fine structure, to put in evidence a structure combining tetrahedra of Germanium and Gallium and trigonal pyramids of Antimony. The arrangement of these structural units permits the introduction of rare earth ions thanks, in particular, to a charge compensation generated by the Ga in a tetrahedral site. Consequently, Pr~(3+) and Dy~(3+) ions inserted in such low phonon energy glasses emit efficiently in mid-IR, between 3.5 and 5 μm. Finally, Dy~(3+) and Pr~(3+) doped Ga_5Ge_(20)Sb_(10)S(Se)_(65) fibers were obtained from bulk glass preform. Efficient emission in mid-IR was obtained by pumping Dy~(3+) doped Ga_5Ge_(20)Sb_(10)S(Se)_(65) and Pr~(3+) doped Ga_5Ge_(20)Sb_(10)S(Se)_(65) fibers at 920 nm and 2 μm, respectively.