Abstract
The mid-infrared (MIR) emission from Pr-doped KPb2Br5 was investigated for possible applications in solid-state lasers. Under optical pumping at 1.55 and 1.907μm, Pr-doped KPb2Br5 exhibited a broad MIR emission centered at 4.6μm, with a bandwidth of 0.9μm at full width half maximum. The dominant contribution of the MIR emission was assigned to the H53→H43 transition of Pr3+ ions. The decay time of the H53 level was measured to be 26.5ms at room temperature and remained nearly unchanged when cooling the sample to 77K. Consistent with the energy-gap law, multiphonon emission quenching is expected to be small in Pr-doped KPb2Br5. A Judd-Ofelt analysis was performed and yielded a radiative lifetime of 40.7ms for the H53 level, which suggests a radiative quantum efficiency of ∼65%. The slightly reduced quantum efficiency is most likely due to residual impurities in the crystal providing nonradiative relaxation channels. The peak emission cross section for the 4.6μm emission was calculated to be ∼0.4×10−20cm2, which compares favorable to other MIR laser transitions.
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