Abstract

The saturated absorption resonance asymmetry and frequency shifts of the stabilized laser with internal absorption have been stadied theoretically as a function of the active medium properties and a resonator configuration. To perform a correct description it is necessary to allow for a contribution of the spatial inhomogeneous of the medium polarization in solving the nonlinear wave equation in a resonator. In the standard approximation of quasioptics the set of equations for the slow amplitudes of a field and for refractive index saturation were found from the steady-state wave equation. As this takes place the third-order polarization was obtained from the solution of the density matrix equations for the molecular two-level system. It was demonstrated that the radial components of the refractive index appear in the slow part of wave equation and determine the field distribution in a cavity. The resulting set of equations was solved with consideration of boundary conditions and the condition of periodicity in a resonator.

© 1996 IEEE