University of New Mexico, Physics and Astronomy Department, Albuquerque, New Mexico 87131, USA.
Opt Lett. 2013 May 1;38(9):1588-90. doi: 10.1364/OL.38.001588.
We report on bulk optical refrigeration of Yb:YLF crystal to a temperature of 124 K, starting from the ambient. This is achieved by pumping the E4-E5 Stark multiplet transition at ~1020 nm. A lower temperature of 119±1 K (-154C) with available cooling power of 18 mW is attained when the temperature of the surrounding crystal is reduced to 210 K. This result is within only a few degrees of the minimum achievable temperature of our crystal and signifies the bulk solid-state laser cooling below the National Institute of Standards and Technology (NIST)-defined cryogenic temperature of 123 K.
我们报告了通过抽运1020nm 处的 E4-E5 斯塔克多重态跃迁，将 Yb:YLF 晶体从环境温度冷却到约 124K 的体光学制冷。当周围晶体的温度降低到 210K 时，获得了更低的温度 119±1K（-154°C），同时具有 18mW 的可用制冷功率。这一结果仅比我们晶体可达到的最低温度低几度，标志着体固态激光冷却已经低于美国国家标准与技术研究院（NIST）定义的 123K 低温。
