微波腔镀银实现漫反射冷却的实验研究

Experiment Studies on the Diffuse Light Cooling by Using Silver Plated Microwave Cavity

观测到了使用镀银微波腔产生漫反射光场冷却原子的信号,完成了微波腔与积分球一体化的最后一步。这种冷却方式结构更加简单,且没有涂料,不会对微波场场型造成影响,有利于钟信号的信噪比及对比度提高。同时测试了微波腔冷却在不同冷却光注入方案、漫反射系数及腔表面开孔尺寸下的冷却性能。结果表明端面注入冷却光是目前获得更多冷原子数目的方法,提高腔表面的漫反射系数,可以显著提高冷原子数目。为了充分利用积分球内的冷原子,采用了10mm的通光孔径,测试了不同通光孔径对冷原子信号的影响,证实了目前较大的通光孔径不会影响到冷原子数。

The cold atom absorption signal produced by the silver plated microwave cavity is observed, which finishes the last step of the integration of the microwave cavity and the integrating sphere. This setup which doesnrt use reflective material and won＇t influence the magnetic field distribution is not only simpler, but also benefit for the signal to noise ratio of the clock signal. Meanwhile, the cooling performances of the cooling microwave cavity are studied with different cooling light injection schemes, diffuse reflective coefficients and apertures. The results show that the scheme of injecting the cooling light from the end surface can get more cold atoms, and the improvement of the reflective coefficient increases the cold atom numbers. Two 10 mm apertures are used in order to take full advantage of cold atoms in the integrating sphere, and the absorption signals for different apertures show that the 10 mm apertures used here won＇t affect the cold atom number.