1School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054 2State Key Laboratory of Advanced Optical Communication System and Network, Institute of Quantum Electronics, School of Electronics Engineering & Computer Science, Peking University, Beijing 100871
Abstract：The sub-Doppler absorption laser spectroscopy at 728 nm transition from the 5$D_ {5/2}$ state to the $6F$ state of cesium with linewidth near 10 MHz is first experimentally performed with indirect pumping from the ground state 6$S_{1/2}$ to the state 7$P_{3/2}$ by a 455.5 nm diode laser. Using a 455.5 nm diode laser as an indirect pump laser, several excited states will be populated due to spontaneous decay from the $7P$ state. We first implement the sub-Doppler absorption laser spectroscopy at 728 nm from the 5$D_ {5/2}$ state to the $6F$ state when Cs atoms within thermal glass cell decay to the 5$D_ {5/2}$ state. Due to velocity transfer effect, the hyperfine structure of 5$D_ {5/2}$ shows a mixed and complicated pattern but very clear structure when the 455.5 nm pumping laser is counter-propagating (or co-propagating) with the 728 nm probing laser.
Wang Y F, Xue X B, Wang D Y, Zhang T G, Hong Y L, Zhuang W and Chen J B 2012 Proceedings of International Frequency Control Symposium (IEEE Baltimore BC) p 1
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Xu Z C, Zhuang W, Wang Y F, Wang D Y, Zhang X G, Xue X B, Pan D and Chen J B 2013 European Frequency and Time Forum and International Frequency Control Symposium p 395
2017, Vol. 34 
