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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Atomic trapping in the excited state due to dynamically modified spontaneous relaxation

Yevgeny V. Radeonychev, Olga A. Kocharovskaya

Published Feb 25, 1999• 0 citations
Publisher

Abstract

We show that three-level atoms can be trapped in the excited energy state, as a result of drastic modification of spontaneous relaxation under the action of strong coherent driving field, when one of two dynamic Stark levels crosses a nearby atomic state.
DOI
10.1117/12.340117

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Summary form only given. In three-level atoms the drastic modification of the decay rates by the driving field may occur in the free space as soon as one dynamic Stark level crosses a neighboring unperturbed atomic energy state. This leads to appearance of spontaneous emission from the former ground state to the lower dynamic Stark level or spontaneous decay from the upper dynamic Stark level to the excited atomic state. For an experimental realization we propose to use a cell with potassium (/sup 39/K) vapor in magnetic field driven on D1-transition by circular polarized radiation of Ti:sapphire or dye laser.
Spontaneous emission can be modified if the atom is driven by an external coherent field. Such modification include the three-peak spectrum of resonance fluorescence from a two level atom. The spectral line elimination and cancellation of spontaneous emission is possible under conditions that the spontaneous emission from an excited atom can be trapped in the upper states without decaying. The amount of fluorescence in this case as well as the population of the upper levels can be controlled. If spontaneous emission along with atomic transition is suppressed, it is possible to create a population in version on this transition by using a very weak incoherent pumping.
For a 3-level atom in the "V-configuration" (two excited states |1> and |2> each dipole-coupled to a common ground state |g>) interacting with a quantized field, we have found a set of initial atomic state amplitudes for which the usual time-dependent oscillations collapses, and revivals vanish. Preparing the atom initially in this special way forces the atomic population to remain coherently trapped in this configuration. The dressed-state energy of this particular linear combination of bare-atom states is zero, so that eiEt= 1 and the population remains constant in time - as long as the applied field remains on.