用于增加三维磁光阱装载率的二维冷原子束系统

在原子干涉仪、原子陀螺仪等精密测量的领域中,最基本也是最重要的一步就获得冷原子,而当实验需要连续和高重复性的测量时,对于冷原子的装载就会要求有更快的速率。为了能更快的装载冷原子,就需要一束高通量、低速的冷原子束。在实验上实现了87Rb原子的二维冷却磁光阱（2D-MOT）的冷原子束,其对3D-MOT的装载率为2.8109 atoms/s。该系统基于87Rb原子2D-MOT+push beam方案,选择了红失谐为20 MHz功率为50 mW的两束入射冷却光,在冷却光入射到真空腔之前使用扩束系统将其光斑扩束成短轴为25 mm、长轴为75 mm的椭圆形光斑,在冷却光入射真空腔之后在真空腔的另一端用镀了四分之一波片膜的反射镜来得到对射的激光。

2D cold atomic beam system for increasing the loading rate of 3D MOT

In the field of precision measurement such as atom interferometers and atom gyros, the most basic and important step was to obtain cold atoms. When experiments require continuous and highly reproducible measurements, the faster loading rate of cold atoms will be required. In order to load cold atoms faster, a high-flux, low-speed cold atomic beam was required. A 2D cooling system of 87Rb atoms based on 2D-MOT+push beam scheme was built, the 3D-MOT loaded from the 2D-MOT was measured and a loading rate of 2.8109 atoms/s was achieved. Two pairs of cooling beams with two mirrors with /4 coating were implemented. The beams were transformed into a shape which had an ellipse profile with 25 mm short axis and 75 mm long axis, by using cylindrical lenses.