We theoretically analysed the linewidth of the probe absorption spectrum in a cold Cs atom-molecule system. The tunnelling coupling between the two excited molecular states, especially for the Cs atom molecule system,...We theoretically analysed the linewidth of the probe absorption spectrum in a cold Cs atom-molecule system. The tunnelling coupling between the two excited molecular states, especially for the Cs atom molecule system, plays an important role in obtaining the sub-natural linewidth of the probe absorption spectrum. For example, when the tunnelling couple strength fulfils σ12=10γab1, the linewidth is only about 0.66 MHz. Moreover, since the linewidth of interest is dominated by the tunnelling coupling, the absorption peak becomes very narrow even in the case of large pump laser intensities.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos 10444002, 10674087 and 10574084)973 program (Grant Nos 2006CB921603 and 2008CB317103)SRF for ROCS, SEM, SRF for ROCS, Ministry of Personal of China and SRF for ROCS of Shanxi Province of China
文摘We theoretically analysed the linewidth of the probe absorption spectrum in a cold Cs atom-molecule system. The tunnelling coupling between the two excited molecular states, especially for the Cs atom molecule system, plays an important role in obtaining the sub-natural linewidth of the probe absorption spectrum. For example, when the tunnelling couple strength fulfils σ12=10γab1, the linewidth is only about 0.66 MHz. Moreover, since the linewidth of interest is dominated by the tunnelling coupling, the absorption peak becomes very narrow even in the case of large pump laser intensities.
