Regular and stochastic small-scale phase heterogeneities of gas lasers active medium and their influence on optical resonator efficiency

The specific features of the unstable optical resonator of a large gas laser with an active medium containing regular and stochastic phase inhomogeneities are considered. The output power of the laser, the Strehl number, the angular divergence and average far-field intensity are described as function of the spatial scale and structure of inhomogeneities of the refractive index of the active medium.