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We discuss the possibility of converting a simple pole in the radiative decayof a state into a pole of higher order by using resonant electromagneticfields. This process of creation of higher order pole is controllable by theintensity of the laser field. We use density matrix and Liouville space andpresent the modification of the Lorentzian line shapes (Breit-Wigner formula)for example to ones involving square of Lorentzian and derivatives ofLorentzians.

Laser Field Initiation of Higher Order Poles of S-Matrix-Optical Realization of Field Theoretic Models