Dr. Olusola Oyebola Profile

Dr. Olusola Oyebola

at Univ of Lagos

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Proceedings Article | 7 March 2014 Paper

Infrared absorption and fluorescence properties of Ho-doped KPb2Br5

Ei Brown, Uwe Hömmerich, Simone Hyater-Adams, Olusola Oyebola, Althea Bluiett, Sudhir Trivedi

Proceedings Volume 8982, 89821S (2014) https://doi.org/10.1117/12.2037948

KEYWORDS: Absorption, Holmium, Crystals, Quantum efficiency, Infrared radiation, Luminescence, Solid state lasers, Infrared spectroscopy, Spectroscopy, Phonons

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Spectroscopic properties of the 2 μm infrared (IR) emission (⁵I₇ → ⁵I₈) 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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