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We investigate the transient response of a $\Lambda$-type system with onetransition decaying to a modified radiation reservoir with an inversesquare-root singular density of modes at threshold, under conditions oftransparency. We calculate the time evolution of the linear susceptibility forthe probe laser field and show that, depending on the strength of the couplingto the modified vacuum and the background decay, the probe transmission canexhibit behaviour ranging from underdamped to overdamped oscillations.Transient gain without population inversion is also possible depending on thesystem's parameters.Comment: 4 pages RevTex, including 3 figures. To appear in Phys. Rev.

Transient properties of modified reservoir-induced transparency