Related Experiment Video
Updated: Aug 18, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Absolute frequency measurement of rubidium 5S-7S two-photon transitions with a femtosecond laser comb
Hsiang-Chen Chui1, Ming-Sheng Ko, Yi-Wei Liu
1Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan. hcchui@itri.org.tw
Abstract:
The absolute frequencies of rubidium 5S-7S two-photon transitions at 760 nm are measured to an accuracy of 20 kHz with an optical frequency comb based on a mode-locked femtosecond Ti:sapphire laser. The rubidium 5S-7S two-photon transitions are potential candidates for frequency standards and serve as important optical frequency standards for telecommunication applications. The accuracy of the hyperfine constant of the 7S1/2 state is improved by a factor of 5 in comparison with previous results.
Related Concept Videos
UV–Vis Spectroscopy: Molecular Electronic Transitions
Atomic Emission Spectroscopy: Instrumentation

