Abstract
Cross-relaxation processes in Pr3+ doped selenide glass provided efficient population of the lowest excited state 3H5 of Pr3+ ions under pulsed pumping by 1.54 µm Er:glass laser. Stimulated emission at 5.5-5.9 µm corresponding to 3H5→3H4 transition of Pr3+ ions was observed in vitreous matrix for the first time.
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