| Autor: |
Hömmerich, U., Brown, E., Amedzake, P., Trivedi, S. B., Zavada, J. M. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 12/1/2006, Vol. 100 Issue 11, p113507, 4p, 2 Charts, 4 Graphs |
| Abstrakt: |
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 1.907 μm, Pr-doped KPb2Br5 exhibited a broad MIR emission centered at 4.6 μm, with a bandwidth of 0.9 μm at full width half maximum. The dominant contribution of the MIR emission was assigned to the 3H5→3H4 transition of Pr3+ ions. The decay time of the 3H5 level was measured to be 26.5 ms at room temperature and remained nearly unchanged when cooling the sample to 77 K. 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 40.7 ms for the 3H5 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 4.6 μm emission was calculated to be ∼0.4×10-20 cm2, which compares favorable to other MIR laser transitions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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