Tm3+-Doped Chalcohalide Glass for Optical Amplifiers at 1.22 and 1.47 µm

Abstract

50GeSe2–25In2Se3–25CsI chalcohalide glass was prepared with the addition of Tm3+ in 0.1–1.0 wt % concentrations. Radiative parameters evaluated by the Judd–Ofelt analysis suggest a strong covalence nature of the host. Emissions peak at 1.22 and 1.46 µm were observed with the 808 nm laser excitation. The 1.22 µm one is attributed to the Tm3+:3H5→3H6 transition. The Raman spectra of the host suggest that the I-rich local environment of Tm3+ promotes the strong 1.22 µm emission. The emission intensity comes to the maximum at Tm3+ concentration of 0.7 and 0.5 wt % for the 1.22 and 1.47 µm emissions respectively. In addition, its potential application as the host material for novel optical amplifiers was discussed.