Suppression of the spontaneous emission

The suppression of the spontaneous emission of a hydrogen atom in the 2/ o) = a) state, which can only decay to a single (the ground IS q)) state, is briefly presented here. It can be achieved by coupling the 2Po) state with the 3.S) = b) state using a resonant CW laser field. 

In Reference [38], it is further shown that suppression of the spontaneous emission can be equally well achieved in a molecular system. The difficulty with molecular systems lies in the fact that there is usually a multitude of final states to which the system can emit. In this example, suppressing the emission from a particular vibrational state a) belonging to the 1 S (A) electronic manifold of the Sodium dimer is considered, when aided by a particular vibrational state b) belonging to the 2 electronic manifold. The relevant potentials are displayed in Figure 9.12. 

Figure 9.13 Suppression of the spontaneous emission of the sodium dimer. The optimization time T (marked by a triangle) is 0.2/r(= 10 ns), and the total time range displayed is up to 3/F(= 150 ns). AE is the Autler-Townes splitting induced by die CW laser and F is the natural linewidth. Reprinted figure by permission from Ref. [38]. Copyright 2003 by the American Physical Society.

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