FIELD: laser weld and cut equipment. SUBSTANCE: device has resonator and mirror with controlled curvature. Resonator is non-stable in one plane. In another orthogonal plane it is designed as stable resonator. Controlled-shape mirror becomes cylinder which curvature alters in time when control periodic signal is applied to mirror. This results in possibility to use all-reflecting optical units which provide constant three-dimensional beam characteristics. EFFECT: increased levels of output beam intensity. 3 cl, 2 dwg
