Crystal growth by the heat exchanger method, spectroscopic characterization and laser operation of high-purity Yb:Lu₂O₃

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• 作者：Rigo Peters ; Christian Krä ; nkel ; Klaus Petermann ; Gü ; nter Huber
• 关键词：A2. Growth from melt ; A2. Heat exchanger method ; B1. Rare earth compounds ; B1. Ytterbium ; B3. Solid-state lasers
• 刊名：Journal of Crystal Growth
• 出版年：2008
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：April 2008
• 卷：310
• 期：7-9
• 页码：1934-1938
• 文件大小：351 K

摘要

Yb-doped Lu₂O₃ crystals of very high optical quality have been grown by the heat exchanger method from a Re-crucible using high-purity raw materials and an improved crystal growth technique. The composition of the grown crystals has been determined by microprobe analysis. The fluorescence lifetime, measured by the pinhole method, revealed no concentration quenching up the maximum grown doping concentration of 10 at%. Laser operation of these high-purity samples was studied in a nearly concentric resonator under Ti:sapphire pumping. Compared to previous results the cw laser efficiency of Yb:Lu₂O₃ could be increased considerably to a maximum slope efficiency of η_s=86%and 76%at a laser wavelength of 1034 and 1080 nm, respectively.