Growth, structure, and spectroscopic properties of an Yb3+, Ho3+ co-doped LuYAG single crystal for 2.91 μm laser
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Yb3+ and Ho3+ co-doped Lu2.55Y0.45Al5O12 (Yb,Ho:LuYAG) crystal with a size of Φ 28 mm × 120 mm was successfully grown by the Czochralski method. The lattice parameters of the as-grown Yb,Ho:LuYAG crystal were obtained by Rietveld refinement with the XRD data. The result of X-ray rocking curve indicated that the grown crystal has a high crystalline quality. From strong absorption band near 935 nm and emission bands within 2700–3000 nm, we found that the Yb3+ ions can be acted as the sensitizer for the activator ions Ho3+. Furthermore, the lifetimes of the 5I6 and 5I7 levels of the Ho3+ ions were 68.25 μs and 7.58 ms, respectively. These results indicated that the Yb,Ho:LuYAG crystal is a promising gain material for 2.91 μm laser pumped by a 940 nm LD.
This work was financially supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 51872290, 51702322 and 51802307), the China Postdoctoral Science Foundation (Grant No. 2018M642547), the Natural Science Foundation of Anhui Provence (Grant No. 1908085QE176), the National Key Research and Development Program of China (Grant No. 2016YFB1102301), and the Open Foundation of Science and Technology on Solid-State Laser Laboratory.
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