中文摘要：

简要介绍了我们实验组冷却、俘获^47Rb原子的磁光阱装置及冷却俘获过程。采用收集荧光法测得了俘获的冷原子数目，并根据冷原子团尺寸推算出了冷原子团密度。通过在冷原子团下方4mm，7mm，10mm三处设置圆柱形探测光束，在原子自由下落过程中获得了短程飞行时间（TOF）吸收信号，通过数值拟合得到了冷原子的温度。结果表明：俘获的冷原子数目大约为10^9个，密度大约为10^11个／cm^3，冷却温度约为200IxK，该冷原子团能作为很好的EIT介质。

英文摘要：

The experimental setup for cooling and trapping^87Rb atoms in magneto-optical trap （MOT） and the process of them are briefly introduced in this paper. The number of cold atoms is measured by detecting the fluorescence emitted from^87Rb atoms. The laser probe beam is set at the positions which are 4mm, 7mm, 10mm below the atoms cloud, the short-distance time-of-flight （TOF） absorption signals are obtained during the falling of atoms. The average temperature of cold atoms is obtained by numerical simulating. The results show that the number of cold atoms is about 10^9, the density is about 10^11/cm^3 and the cooling temperature of atomic cloud is about 200μK, such cold atoms can be used as good EIT medium.