title: Erbium fiber laser-based direct frequency comb spectroscopy of Rb two-photon transitions.
abstract: We demonstrate the direct frequency comb spectroscopy of Rb 5S→5D two-photon transitions directly excited by an optical frequency comb (OFC) in 1.5 μm fiber communication bands. A chain of comb spectral manipulation and quantum coherence control is implemented to enhance the efficiency of second harmonic OFC generation and eliminate the Doppler-broadening background. The direct frequency comb spectroscopy with clearly resolved transition lines is obtained. Our scheme provides a potential approach to realize the OFC at ~1.5 μm with high stability and accuracy.
authors.forename: Jiutao
authors.initials: J
authors.lastname: Wu
authors.forename: Dong
authors.initials: D
authors.lastname: Hou
authors.forename: Zhengyu
authors.initials: Z
authors.lastname: Qin
authors.forename: Xiaoliang
authors.initials: X
authors.lastname: Dai
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Zhang
authors.forename: Jianye
authors.initials: J
authors.lastname: Zhao