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Proceedings Paper

Comparative spectroscopic studies of Ho: KPb2Cl5, Ho: KPb2Br5, and Ho: YAG for 2 µm laser cooling applications
Author(s): Ei E. Brown; Uwe Hömmerich; Eric Kumi-Barimah; Althea Bluiett; Sudhir B. Trivedi
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Paper Abstract

The infrared (IR) absorption and emission properties of Ho:KPC, Ho:KPB, and Ho:YAG were compared for possible applications in 2 µm laser cooling. Ho:KPC and Ho:KPB crystals were grown by vertical Bridgman technique using purified starting materials. A commercial Ho:YAG crystal was included in this study for comparison. Under resonant pumping at ~1.907 µm, the Ho-doped KPC/KPB crystals exhibited broad IR emission centered at ~2 µm based on the Ho3+ intra-4f transition 5I75I8. Under similar experimental conditions, Ho:YAG showed a narrow-structured emission band reflective of individual Stark levels. The average emission wavelength for Ho:YAG was determined to be ~2.03 µm. Initial heat loading/cooling experiments under ambient air were performed using a fiber laser operating at ~2.036 µm with an output power of 2 W. The Ho:KPC/KPB crystals exhibited small temperature increases of ~1.0 ºC. A significantly larger temperature increase of ~5 ºC was observed for Ho:YAG. IR transmission studies revealed the existence of OH impurities in the Ho-doped halides, which possibly lead to non-radiative decay channels.

Paper Details

Date Published: 10 March 2015
PDF: 7 pages
Proc. SPIE 9380, Laser Refrigeration of Solids VIII, 93800O (10 March 2015); doi: 10.1117/12.2077722
Show Author Affiliations
Ei E. Brown, Hampton Univ. (United States)
Uwe Hömmerich, Hampton Univ. (United States)
Eric Kumi-Barimah, Hampton Univ. (United States)
Althea Bluiett, Elizabeth City State Univ. (United States)
Sudhir B. Trivedi, Brimrose Corp. of America (United States)

Published in SPIE Proceedings Vol. 9380:
Laser Refrigeration of Solids VIII
Richard I. Epstein; Denis V. Seletskiy; Mansoor Sheik-Bahae, Editor(s)

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