Dynamics in direct two-photon transition by frequency combs

TL;DR

This paper analyzes the dynamics of direct two-photon transitions driven by optical frequency combs, demonstrating enhanced atomic population transfer and momentum transfer, with potential applications in atomic cooling and precision spectroscopy.

Contribution

It provides a theoretical analysis of DTPT dynamics with optical combs, showing enhanced effects in multi-level atomic systems and potential for simultaneous excitation of different atoms.

Findings

Increased population transfer in three- and six-level atomic systems.

Enhanced momentum transfer compared to DTPT-free processes.

Potential for simultaneous excitation of rubidium and cesium atoms.

Abstract

Two-photon resonance transition technology has been proven to have a wide range of applications,it's limited by the available wavelength of commercial lasers.The application of optical comb technology with direct two-photon transition (DTPT) will not be restricted by cw lasers.This article will further theoretically analyze the dynamics effects of the DTPT process driven by optical frequency combs. In a three-level atomic system, the population of particles and the amount of momentum transfer on atoms are increased compared to that of the DTPT-free process. The 17% of population increasement in 6-level system of cesium atoms has verified that DTPT process has a robust enhancement on the effect of momentum transfer. It can be used to excite the DTPTs of rubidium and cesium simultaneously with the same mode-locked laser. And this technology has potential applications in cooling different atoms to obtain polar cold molecules, as well as high-precision spectroscopy measurement.