Spatial field configuration in a cavity with nonresonant feedback

An investigation is made of the spatial characteristics of the field in a cavity one of whose mirrors is replaced by a diffuse reflector with a "wide" scattering indicatrix. A derivation is given of a system of integral equations for the determination of the field correlation function in the cavity and its approximate solution is given. It is shown that the nature of the field correlation function is established after the first reflection: subsequent reflections simply result in small corrections. An estimate is obtained of the field correlation radius in the cavity.