7 June 2017 Forward to cryogenic temperature: laser cooling of Yb: LuLiF crystal
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Abstract
The high quality Yb-doped fluoride crystals have broad prospects for optical refrigeration. We have laser cooled the Yb:LuLiF crystal to a temperature below the limit of current thermoelectric coolers (~180 K). The 5% Yb:LuLiF crystal sample has a geometry of 2 mm×2 mm×5 mm and was supported by two fibers of 200 μm in diameter. They were placed in a ~2×10-4 Pa vacuum chamber with an environment temperature of ~294.5 K. The 1019 nm CW laser of power 38.7 W was adopted to irradiate the sample. The temperature of the sample was measured utilizing the DLT methods. After 20 minutes of laser irradiation, the 5% Yb:LuLiF crystal sample was cooled down to ~182.4 K. By further optimizing experimental conditions and increasing the doped Yb concentration, the Yb:LuLiF crystal might be optically cooled below the cryogenic temperature of 123K in the near future.
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Biao Zhong, Biao Zhong, Hao Luo, Hao Luo, Yongqing Lei, Yongqing Lei, Yanling Shi, Yanling Shi, Jianping Yin, Jianping Yin, } "Forward to cryogenic temperature: laser cooling of Yb: LuLiF crystal", Proc. SPIE 10180, Tri-Technology Device Refrigeration (TTDR) II, 101800C (7 June 2017); doi: 10.1117/12.2262624; https://doi.org/10.1117/12.2262624
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