Based on the polarization interference between one-photon and two-photon processes, we demonstrated an ultrafast modulation spectroscopy in a cascade three-level system (UMSCTS) in Na vapor, which showed a modulation of the four-wave mixing signal intensity with a 55-fs period, corresponding to the beating between the resonant frequencies of the transitions from 3 ${\mathit{S}}_{1/2}$ to 3 ${\mathit{P}}_{3/2}$ and from 3 ${\mathit{P}}_{3/2}$ to 4 ${\mathit{D}}_{3/2,5/2}$ . We have also discussed the possibility of using UMSCTS to measure the energy levels of the excited states with Doppler-free precision.Based on the polarization interference between one-photon and two-photon processes, we demonstrated an ultrafast modulation spectroscopy in a cascade three-level system (UMSCTS) in Na vapor, which showed a modulation of the four-wave mixing signal intensity with a 55-fs period, corresponding to the beating between the resonant frequencies of the transitions from 3${\mathit{S}}_{1/2}$ to 3${\mathit{P}}_{3/2}$ and from 3${\mathit{P}}_{3/2}$ to 4${\mathit{D}}_{3/2,5/2}$. We have also discussed the possibility of using UMSCTS to measure the energy levels of the excited states with Doppler-free precision.

Physical Review ADec 1, 199546 citations

Dispersion and absorption study of two-photon transition in cascade three-level system by ultrafast modulation spectroscopy (in Chinese)

Xiaotao Mi, Zhangping Yu, Qinghua Jiang +2 more

Jan 1, 19980 citations

Nonlinear absorption study in four and five energy level systems

Allam Srinivasa Rao

arXiv:1802.09907OptikJun 18, 201810 citations

{\mathit{S}}_{1/2}

to 3

{\mathit{P}}_{3/2}

and from 3

{\mathit{P}}_{3/2}

to 4

{\mathit{D}}_{3/2,5/2}

. We have also discussed the possibility of using UMSCTS to measure the energy levels of the excited states with Doppler-free precision.