Two-Photon Absorption Spectroscopy of 5 S 1/2 – 5 D 5/2 transition of Rb Using Dual-Comb Spectroscopy

Y. Kato, Boris Peter Stoicheff

Sandan Wang, Wanwan Cao, Jinpeng Yuan +3 more

Jiutao Wu, Dong Hou, Zhengyu Qin +2 more

We present the observation of the Rb two-photon spectrum directly excited by an Er:fiber laser comb in a hot atomic vapor system. The influences of the atomic velocity distribution on direct and sequential two-photon transitions are discussed respectively and a combination of corresponding spectral control techniques is developed to eliminate the Doppler broadening background. A direct frequency comb spectroscopy is obtained with high-resolution two-photon transition lines. These techniques would benefit spectroscopy measurement in hot atomic vapor systems, and pave the way for establishing a high-stability optical frequency comb in 1.5 $\ensuremath{\mu}$m optical communication bands based on the Rb two-photon transitions.

Seth Orson, Carson McLaughlin, M. D. Lindsay +1 more

Akiko Nishiyama, Satoru Yoshida, Yoshiaki Nakajima +4 more

transitions of Rb at 1530 nm and precisely determined the absolute frequencies of the transitions, with an uncertainty of less than 1 MHz. The variations of the OODR spectral line shapes due to power broadening and alignment and the effects of polarization on the dual-comb OODR spectra were also analyzed. This study provides a widely applicable technique for Doppler-free dual-comb spectroscopy of various gaseous species.

Carson McLaughlin, Seth Orson, M. D. Lindsay +1 more