本文提供了一种全新的基于俘获损耗荧光光谱技术的里德堡态原子布局测量的方法。相比于场电离光谱该方法可以实现对里德堡态原子数的非破坏测量。利用该方法我们测量了47D5／2和47D3／2里德堡态原子数与里德堡激发光功率的关系, 并使用三能级系统的布洛赫方程对实验结果进行了拟合。通过比较实验和理论结果, 我们发现当激发光功率超过40 μW时, 随着激发光光强的变大47D里德堡态原子数目的增加偏离理论预计, 出现了激发阻塞现象。

Trap loss spectroscopy of ultracold cesium atoms excited to 47D5／2 and 47D3／2Rydberg states are demonstrated.The amplitudes of trap loss spectroscopy of 47D5／2 and 47D3／2are measured by varying Rabi frequency of Rydberg excitation laser.The Bloch equations of ladder-type system are introduced to describe the amplitude ratio of Rydberg states without taking count of the interaction of Rydberg atoms.Moreover, the excitation suppression of Rydberg atoms observed with the continued rising of the power of the Rydberg laser.Trap loss spectroscopy provides a new tool for the research of ultracold Rydberg atom.