Recoil-free spectroscopy of neutral Sr atoms in the Lamb-Dicke regime

Abstract

We have demonstrated a recoil-free spectroscopy on the ${}^1{S}_0-{}^3{P}_1$ transition of strontium atoms confined in a one-dimensional optical lattice. By investigating the wavelength and polarization dependence of the ac Stark shift acting on the ${}^1{S}_0$ and ${}^3{P}_1(m_J=0)$ states, we determined the {\it magic wavelength} where the Stark shifts for both states coincide. The Lamb-Dicke confinement provided by this Stark-free optical lattice enabled the measurement of the atomic spectrum free from Doppler as well as recoil shifts.

5pages, 4figures