Based on the interference between two two-photon processes, we reported a four-level ultrafast modulation spectroscopy in Na vapor, where 3S, 3P, 5S, and 4D formed a four-level system. We studied the temporal behavior of the four-wave mixing signal intensity and obtained signal modulation with period 25 fs, corresponding to the splitting between 5S and 4D. This technique can achieve Doppler-free precision in the measurement of the energy level splitting between two excited states which are dipolar forbidden from the ground state.Based on the interference between two two-photon processes, we reported a four-level ultrafast modulation spectroscopy in Na vapor, where 3S, 3P, 5S, and 4D formed a four-level system. We studied the temporal behavior of the four-wave mixing signal intensity and obtained signal modulation with period 25 fs, corresponding to the splitting between 5S and 4D. This technique can achieve Doppler-free precision in the measurement of the energy level splitting between two excited states which are dipolar forbidden from the ground state.

Chinese Physics LettersJun 1, 19982 citations

Ultrafast modulation of light by light

Nancy J. Halas

Jan 1, 19861 citation

Ultrafast modulation spectroscopy in a cascade three-level system

Panming Fu, Xin Mi, Zuhe Yu +3 more

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

Cavity-Enhanced Ultrafast Spectroscopy

Yuning Chen, Myles Silfies, Thomas K. Allison

Bulletin of the American Physical SocietyMar 5, 20191 citation

Doppler-free ultrafast modulation spectroscopy with phase-conjugation geometry

Panming Fu, Zuhe Yu, Xin Mi +2 more

We have studied theoretically a phase-conjugate ultrafast modulation spectroscopy (PCUMS) in a Doppler-broadened system. The pump beams consist of two frequency components which drive two different transitions. It is found that the four-wave-mixing (FWM) signal exhibits damping oscillation as the relative time delay between two pump beams is varied, from which the energy-level splitting can be deduced. We have considered the cases that pump beams have either narrow band or broadband linewidth and found that for both cases a Doppler-free precision in the measurement of the energy-level splitting can be achieved. The advantage of PCUMS is that the energy-level splitting between states can be widely separated. Finally, the relationship between PCUMS and other Doppler-free techniques in frequency and time domains has also been discussed.We have studied theoretically a phase-conjugate ultrafast modulation spectroscopy (PCUMS) in a Doppler-broadened system. The pump beams consist of two frequency components which drive two different transitions. It is found that the four-wave-mixing (FWM) signal exhibits damping oscillation as the relative time delay between two pump beams is varied, from which the energy-level splitting can be deduced. We have considered the cases that pump beams have either narrow band or broadband linewidth and found that for both cases a Doppler-free precision in the measurement of the energy-level splitting can be achieved. The advantage of PCUMS is that the energy-level splitting between states can be widely separated. Finally, the relationship between PCUMS and other Doppler-free techniques in frequency and time domains has also been discussed.

Physical Review AJul 1, 199428 citations

Addendum E: Ultrafast coherent spectroscopy

Wolfgang Zinth, W. Kaiser

Topics in applied physicsJan 1, 19880 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.