Forward to cryogenic temperature: laser cooling of Yb: LuLiF crystal

Biao Zhong; Hao Luo; Yongqing Lei; Yanling Shi; Jianping Yin

doi:10.1117/12.2262624

7 June 2017 Forward to cryogenic temperature: laser cooling of Yb: LuLiF crystal

Biao Zhong, Hao Luo, Yongqing Lei, Yanling Shi, Jianping Yin

Proceedings Volume 10180, Tri-Technology Device Refrigeration (TTDR) II; 101800C (2017) https://doi.org/10.1117/12.2262624
Event: SPIE Defense + Security, 2017, Anaheim, CA, United States

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.

Conference Presentation

Citation Download Citation

Biao Zhong, Hao Luo, Yongqing Lei, Yanling Shi, and 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); https://doi.org/10.1117/12.2262624

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