The occurrence of the dynamic Stark effect in resonant CARS spectroscopy of a homogeneous medium

Abstract

We discuss the occurrence of the dynamic Stark effect in resonant CARS spectroscopy for a homogeneously broadened medium. We use a four-level system interaction with three monochromatic fields of different frequencies. The equations of the density matrix are obtained in a rotating frame and solved numerically for the steady-state solutions. Analytical expressions are derived for five cases and show a splitting or a broadening of the CARS line. Stark shifts due to intense off-resonance fields are discussed.