7 March 2014 Infrared absorption and fluorescence properties of Ho-doped KPb2Br5
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Proceedings Volume 8982, Optical Components and Materials XI; 89821S (2014) https://doi.org/10.1117/12.2037948
Event: SPIE OPTO, 2014, San Francisco, California, United States
Abstract
Spectroscopic properties of the 2 μm infrared (IR) emission (5I75I8) from trivalent holmium (Ho3+) doped potassium lead bromide (KPb2Br5) are presented. The investigated Ho3+ doped KPb2Br5 (KPB) material was synthesized through purification of starting materials including multi-pass zone-refinement, bromination, and subsequently grown using horizontal Bridgman technique. The bromination process was critical for removing oxidic impurities and enhancing the quality of the crystal. Judd-Ofelt intensity parameters, radiative rates, branching ratios, and emission lifetimes were calculated and compared with results reported for Ho3+ doped KPb2Cl5 (KPC). Under resonant pumping (~1.907 μm), Ho: KPB showed a broad IR emission centered at ~2 μm with an exponential decay time of 7.1 ms at room temperature. The nearly temperature independent emission lifetime is consistent with a negligibly small non-radiative decay rate for the 5I7 excited state of Ho3+, as predicted by the multiphonon energy gap law. The optical absorption, emission and gain cross-sections of Ho: KPB were determined for the 2 μm transition. The Ho: KPB crystal was also evaluated as a potential solid-state material for laser cooling applications.
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Ei E. Brown, Ei E. Brown, Uwe Hömmerich, Uwe Hömmerich, Simone Hyater-Adams, Simone Hyater-Adams, Olusola Oyebola, Olusola Oyebola, Althea Bluiett, Althea Bluiett, Sudhir Trivedi, Sudhir Trivedi, } "Infrared absorption and fluorescence properties of Ho-doped KPb2Br5", Proc. SPIE 8982, Optical Components and Materials XI, 89821S (7 March 2014); doi: 10.1117/12.2037948; https://doi.org/10.1117/12.2037948
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