Normal-mode splitting and linewidth averaging for two-state atoms in an optical cavity
Mark G. Raizen, Robert J. Thompson, Robert J. Brecha, Harry J. Kimble, H. J. Carmichael · Physical Review Letters · 1989
An investigation of the radiative processes for a collection of N two-state atoms strongly coupled to the field of a high-finesse optical cavity is presented. Observations of the spectral response of the composite system to weak external modulation reveal a coupling-induced normal-mode splitting. Linewidth averaging leads to linewidths below the free-space atomic width.