In the last decade, the democratization of frequency combs has pushed developments in the field of atomic clocks in the direction of optical transitions in so-called “optical clocks”. Among the broad variety of architectures, we find the rubidium two-photon atomic clock, which is based on the established hot atomic vapor cell technology. This type of clock keeps a relatively simple architecture and is thus a good candidate for high performance as well as miniature atomic clocks for both space and ground applications. The main limiting factor of the long-term stability of this type of clock is caused by the light shift, which only a few have studied up to now. Here we propose to carry out in-depth research on the light-shift effects in a two-photon rubidium atomic clock and to study and implement advanced mitigation techniques to improve its long-term stability.
