11 March 2013 Non-radiative decay of holmium-doped laser materials
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Proceedings Volume 8638, Laser Refrigeration of Solids VI; 863803 (2013) https://doi.org/10.1117/12.2007511
Event: SPIE OPTO, 2013, San Francisco, California, United States
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?”
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Steven R. Bowman, Shawn O'Connor, Nicholas J. Condon, E. Joseph Friebele, Woohong Kim, B. Shaw, R. S. Quimby, "Non-radiative decay of holmium-doped laser materials", Proc. SPIE 8638, Laser Refrigeration of Solids VI, 863803 (11 March 2013); doi: 10.1117/12.2007511; https://doi.org/10.1117/12.2007511
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