光学制冷至 119 K，低于美国国家标准与技术研究院的低温温度。

Optical refrigeration to 119 K, below National Institute of Standards and Technology cryogenic temperature.

机构信息

University of New Mexico, Physics and Astronomy Department, Albuquerque, New Mexico 87131, USA.

出版信息

Opt Lett. 2013 May 1;38(9):1588-90. doi: 10.1364/OL.38.001588.

DOI:10.1364/OL.38.001588

Abstract

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.

摘要

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。