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Proceedings Paper

Infrared absorption and fluorescence properties of Ho-doped KPb2Br5
Author(s): Ei E. Brown; Uwe Hömmerich; Simone Hyater-Adams; Olusola Oyebola; Althea Bluiett; Sudhir Trivedi
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Paper 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.

Paper Details

Date Published: 7 March 2014
PDF: 8 pages
Proc. SPIE 8982, Optical Components and Materials XI, 89821S (7 March 2014); doi: 10.1117/12.2037948
Show Author Affiliations
Ei E. Brown, Hampton Univ. (United States)
Uwe Hömmerich, Hampton Univ. (United States)
Simone Hyater-Adams, Hampton Univ. (United States)
Olusola Oyebola, Univ. of Lagos (Nigeria)
Althea Bluiett, Elizabeth City State Univ. (United States)
Sudhir Trivedi, Brimrose Corp. of America (United States)

Published in SPIE Proceedings Vol. 8982:
Optical Components and Materials XI
Michel J. F. Digonnet; Shibin Jiang, Editor(s)

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