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Proceedings Paper

Non-radiative decay of holmium-doped laser materials
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Paper Abstract

Anti-Stokes fluorescence cooling has been demonstrated in a number rare earth doped materials. Ytterbium doped oxides and fluorides, such as ZBLAN, YLF, and YAG, were the first materials to exhibit cooling.1,2,3 These materials were originally developed as laser gain media and fluorescence cooling was eventually incorporated into the 1μm lasers to reduce detrimental thermal loading.4 Anti-Stokes cooling can offset quantum defect heating allowing laser power to be scaled to very high average powers. Since the early work in ytterbium, fluorescence cooling has been demonstrated in both erbium and thulium doped materials.5,6 These materials were also initially developed as lasing media and their fluorescence cooling could be used to increase laser powers at 1.5μm and 2.0μm. In this study we examine the radiative efficiency of holmium and ask the question, “Can anti-Stokes fluorescence cooling be extended beyond 2μm?”

Paper Details

Date Published: 11 March 2013
PDF: 6 pages
Proc. SPIE 8638, Laser Refrigeration of Solids VI, 863803 (11 March 2013); doi: 10.1117/12.2007511
Show Author Affiliations
Steven R. Bowman, U.S. Naval Research Lab. (United States)
Shawn O'Connor, U.S. Naval Research Lab. (United States)
Nicholas J. Condon, U.S. Naval Research Lab. (United States)
E. Joseph Friebele, U.S. Naval Research Lab. (United States)
Woohong Kim, U.S. Naval Research Lab. (United States)
B. Shaw, U.S. Naval Research Lab. (United States)
R. S. Quimby, Worcester Polytechnic Institute (United States)


Published in SPIE Proceedings Vol. 8638:
Laser Refrigeration of Solids VI
Richard I. Epstein; Denis V. Seletskiy; Mansoor Sheik-Bahae, Editor(s)

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