We examine the effects of driving Geld linewidth on a one-atom dressed state laser. Unexpectedly, the linewidth leads to anomalous effects on the cavity Geld. The mean photon number of the cavity Geld is raised or the normalized variance is reduced to a certain degree as the linewidth increases for an appropriate range of parameters. The responsible mechanism is attributed to the fluctuation-induced modification of the electromagnetic reservoir where the atom stays.
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