Tb³⁺ doped Ga₅Ge₂₀Sb₁₀Se_65-xTe_x (x=0-37.5) chalcogenide glasses and fibers for MWIR and LWIR emissions

N. Abdellaoui (1) , F. Starecki (2) , Catherine Boussard-Plédel (1) , Y. Shpotyuk (1) , J-L. Doualan (2) , A. Braud (2) , E. Baudet (3) , P. Nemec (3) , François Cheviré (1) , Marc Dussauze (4) , B. Bureau (1) , P. Camy (2) , Virginie Nazabal (1)

1 ISCR - Institut des Sciences Chimiques de Rennes
2 CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
3 University of Pardubice
4 ISM - Institut des Sciences Moléculaires

Chalcogenide glasses with a nominal composition of Ga₅Ge₂₀Sb₁₀Se_65-xTe_x (x = 0, 10, 20, 25, 30, 32.5, 35, 37.5) were synthesized. Their physico-chemical properties, glass network structure and optical properties are clearly modified via the substitution of selenium by tellurium. Based on a detailed study of the Ga₅Ge₂₀Sb₁₀Se_65-xTe_xTex bulk glasses properties, the Ga₅Ge₂₀Sb₁₀Se₄₅Te₂₀ seleno-telluride glass optimal composition has been selected for fiber drawing. The luminescence properties of Tb³⁺ (500 ppm) doped Ga₅Ge₂₀Sb₁₀Se₆₅ and Ga₅Ge₂₀Sb₁₀Se₄₅Te₂₀ bulk glasses and fibers were studied. Radiative transitions parameters calculated from the Judd-Ofelt theory are compared to the experimental values. Mid-wavelength infrared emission in the range of 4.3-6.0 μm is attributed to the ⁷F₅→⁷F₆ transition of Tb³⁺ ions with a corresponding experimental lifetime of 8.9 and 7.8 ms for the selenide and seleno-telluride matrix, respectively. The ⁷F₄→⁷F₆emission was recorded at 3.1 μm with a good signal-to-noise ratio, evidencing a rather strong emission from the ⁷F₄ manifold. Finally, although it was expected that the phonon energy will be lower for telluride glasses, selenide glasses are still more suitable for mid-wavelength infrared and long wavelength infrared emissions with well-defined emissions from 3.1 to 8 μm.

Domaines: Matériaux; Optique [physics.optics]

N. Abdellaoui, F. Starecki, Catherine Boussard-Plédel, Y. Shpotyuk, J-L. Doualan, et al.. Tb³⁺ doped Ga₅Ge₂₀Sb₁₀Se_65-xTe_x (x=0-37.5) chalcogenide glasses and fibers for MWIR and LWIR emissions. Optical Materials Express, 2018, 8 (9), pp.2887-2900. ⟨10.1364/OME.8.002887⟩. ⟨hal-01879773⟩