Steady-state quantum interference in resonance fluorescence
D. A. Cardimona, M. G. Raymer, and C. R. Stroud, Jr.
J. Phys. B 15, 55 (1982).
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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 results 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
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