Zhou et al. (1982) have discussed the modes of a laser resonator, consisting of a mirror and a retroreflecting corner cube. A resonator of the considered type is inherently insensitive to the tilt of the corner cube. The present investigation is, therefore, concerned with the simulation of a model of a cavity which involves one real and one image mirror. The modes of the resonator are eigensolutions of a one-way diffraction equation of the simulated cavity. Solutons are obtained with and without the refractive astigmatism of the inclined corner cube. By measuring the variation of the corresponding laser output, the effect of the rotation of the corner cube is studied.