Steady-state quantum interference in resonance fluorescence

D A Cardimona, M G Raymer, C R Stroud
1982 Journal of Physics B Atomic and Molecular Physics  
It is shown that when a monochromatic laser couples a single atomic ground level to two closely spaced excited levels the system can be driven into a state in which quantum interference prevents any fluorescence from the excited levels, regardless of the intensity of the exciting field. This steady-state interference occurs only at a particular excitation frequency which depends on the separation of the excited states and the relative size of the two transition dipole matrix elements. The
more » ... s are derived from the density matrix equations of motion. It is shown that a correct description of the effect requires the inclusion of generalised Einstein A coefficients which are usually neglected in phenomenological damping theories. A dressed-state analysis is introduced to simplify the generalisation to atoms having more complex manifolds of excited states. Analogous interferences in multiphoton absorption and ionisation are also discussed briefly.
doi:10.1088/0022-3700/15/1/012 fatcat:lzdt7whivndg3mhnfp5dufumyi