Abstract
We report an observation of the subnatural-linewidth spectroscopy in cold $^{6}\mathrm{Li}$ atoms by combining the interference contrast method and the time-delayed coincidence technique. The measured linewidth of ${D}_{1}$ lines is as narrow as 3.6 MHz, which is well below its natural linewidth of 5.8 MHz. The hyperfine splitting of the $2{P}_{1/2}$ state is measured as 26.112(20) MHz with this subnatural-linewidth spectroscopy. The transitions of the ${D}_{2}$ lines are partially resolved by using the developed technique. The time-delayed coincidence technique based on the interference contrast method in cold atoms provides a route for robust fluorescence measurements and determination of unresolved transitions.
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