基于拉曼泵浦-探测光谱的冷原子温度估算

提出了基于拉曼泵浦-探测技术得到的原子吸收谱线获取冷原子温度的方案,并将其应用于85Rb原子磁光阱中。实验中,原子在囚禁光和探测光的共同作用下发生受激拉曼跃迁,产生亚自然线宽的类色散峰,通过把该类色散峰与理论模型进行拟合估算出被囚禁85Rb冷原子团的温度为230 μK。相对于飞行时间测温法,该方案提供了一种简捷的测量冷原子温度的方法。

Abstract

A scheme is proposed to obtain the cold atom temperature by using atomic absorption spectrometry obtained based on Raman pump-probe technique, and the proposed scheme is applied to the magneto-optical trap of 85Rb atoms. In experiment, the stimulated Raman transition of atoms occurs as the trapping and probe lasers interact with the cold atoms simultaneously. Dispersion-like peaks of sub-natural linewidth are generated. By fitting the dispersion-like peaks with theoretical model, the temperature of trapped cold 85Rb atoms is estimated, which is about 230 μK. Compared with the time-of-flight measurement method, the scheme provides a relatively simple method to estimate cold atom temperature.

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程雍, 谭政, 王谨, 詹明生. 基于拉曼泵浦-探测光谱的冷原子温度估算[J]. 量子电子学报, 2017, 34(1): 36. CHENG Yong, TAN Zheng, WANG Jin, ZHAN Mingsheng. Cold atom temperature estimate based on Raman pump-probe spectroscopy[J]. Chinese Journal of Quantum Electronics, 2017, 34(1): 36.

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