Inverted Bennett hole exhibited by a laser with an extracavity absorption cell

An analysis is made of a laser with an external absorption cell and a system of opposite (strong and probe) waves. The frequency of the probe wave is shifted relative to the strong saturating wave, and this makes it convenient to record an inverted Bennett hole in an absorption line of the extracavity absorber, and also to stabilize the emission frequency of the laser shifted relative to the center of the absorption line.