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Proceedings Paper

Forward to cryogenic temperature: laser cooling of Yb: LuLiF crystal
Author(s): Biao Zhong; Hao Luo; Yongqing Lei; Yanling Shi; Jianping Yin
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Paper 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.

Paper Details

Date Published: 7 June 2017
PDF: 7 pages
Proc. SPIE 10180, Tri-Technology Device Refrigeration (TTDR) II, 101800C (7 June 2017); doi: 10.1117/12.2262624
Show Author Affiliations
Biao Zhong, East China Normal Univ. (China)
Hao Luo, East China Normal Univ. (China)
Yongqing Lei, East China Normal Univ. (China)
Yanling Shi, East China Normal Univ. (China)
Jianping Yin, East China Normal Univ. (China)

Published in SPIE Proceedings Vol. 10180:
Tri-Technology Device Refrigeration (TTDR) II
Richard I. Epstein; Bjørn F. Andresen; Tonny Benschop; Joseph P. Heremans; Sergey V. Riabzev; Mansoor Sheik-Bahae, Editor(s)

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