Abstract
The paper discusses effects of spatial inhomogeneities introduced by a standing wave saturator and observed by a probe laser in a stationary three-level medium. AC Stark splitting gives rise to spatial selectivity which enables one to choose the region of strongest interaction by probe detuning. It provides an easy explanation to the probe spectrum which may exhibit somewhat unexpected features depending on the relative magnitude of the relaxation rates. The spatial selection method based on the ac Stark splitting is not limited to a standing-wave saturator, but may find applications in other field configurations, too. The model calculation is applied to an investigation of mode competition effects in a twowavelength laser.
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