Theory of resonators with wavefront-reversing mirrors

An analysis is made of the problem of determination of the oscillation modes in a plane-parallel resonator with one wavefront-reversing mirror. No restrictions are imposed on the dimensions of the mirrors forming the resonator. Expressions are obtained for the fields of the oscillation modes on the mirrors. It is shown that these fields are in the form of Gaussian-Hermitian beams with parameters depending on the ratio of the transverse dimensions of the mirrors.