Pr3+- and Pr3+/ Er3+ -Doped Selenide Glasses for Potential 1.6 mm Optical Amplifier Materials

摘要

1.6 μm emission originated from Pr3+: (3F3, 3F4) → 3H4transition in Pr3+- and Pr3+/Er3+-doped selenide glasses wasinvestigated under an optical pump of a conventional 1480nm laser diode. The measured peak wavelength and fullwidthat half-maximum of the fluorescent emission are~1650 nm and ~120 nm, respectively. A moderate lifetimeof the thermally coupled upper manifolds of ~212 ± 10 μstogether with a high stimulated emission cross-section of~(3 ± 1)*10-20 cm2 promises to be useful for 1.6 μm bandfiber-optic amplifiers that can be pumped with an existinghigh-power 1480 nm laser diode. Codoping Er3+ enhancesthe emission intensity by way of a nonradiative Er3+: 4I13/2Pr3+: (3F3, 3F4) energy transfer. The Dexter model basedon the spectral overlap between donor emission and acceptorabsorption describes well the energy transfer from Er3+to Pr3+ in these glasses. Also discussed in this paper are majortransmission loss mechanisms of a selenide glass opticalfiber.