Topper Brian, Peysokhan Mostafa, Albrecht Alexander R, Flores Angel S, Kuhn Stefan, Hässner Denny, Hein Sigrun, Hupel Christian, Nold Johannes, Haarlammert Nicoletta, Schreiber Thomas, Sheik-Bahae Mansoor, Mafi Arash
Opt Lett. 2021 Nov 15;46(22):5707-5710. doi: 10.1364/OL.444709.
An ytterbium doped silica optical fiber with a core diameter of 900µ has been cooled by 18.4 K below ambient temperature by pumping with 20 W of 1035 nm light in vacuum. In air, cooling by 3.6 K below ambient was observed with the same 20 W pump. The temperatures were measured with a thermal imaging camera and differential luminescence thermometry. The cooling efficiency is calculated to be 1.2±0.1. The core of the fiber was codoped with for an Al to Yb ratio of 6:1, to allow for a larger Yb concentration and enhanced laser cooling.
一根纤芯直径为900微米的掺镱石英光纤，在真空中用20瓦的1035纳米光泵浦，已被冷却至比环境温度低18.4开尔文。在空气中，用相同的20瓦泵浦观察到比环境温度低3.6开尔文的冷却效果。温度用热成像相机和差分发光测温法测量。计算得出冷却效率为1.2±0.1。光纤纤芯共掺杂了铝，铝与镱的比例为6:1，以实现更高的镱浓度并增强激光冷却效果。
