Abstract: A device for beam machining of materials comprising a pin-point source (1) of optical radiation and a concentrating reflector (2) whose reflecting surface has the form of a surface of revolution. The generatrix of said surface of the concentrating reflector (2) is made up of arcs of confocal ellipses (3), lengths of rays (4) emitted from the focus concident with the radiation source (1) and connecting the ends of arcs of ellipses, and arcs of circles (5) with the center in said focus. The size of the boundary segments and their relative arrangement are established on the condition of a most complete collection of the radiation from the pin-point source (1) in the region of the focal point which is coincident with the surface of the machined material, affording a vast possibility of changing the shape of the reflector.

Abstract: A device for beam machining comprises an extended radiation source (1) and a concentrating reflector (2) whose reflecting surface has the form of a surface of revolution made up of several successively-joined segments (3). The shape of the reflector generating surface on any segment except the initial one located near the apex M of the reflector (2) and the boundaries between the joined segments are defined by a system of equiations. The initial segment of the profile of the reflector (2) extending from its apex M to the profile points R.sub.1, z.sub.1 has the shape of a segment of the curve of the 2nd order. Installed on the end of the concentrating reflector is a pressuretight protective transparent partition (4) whose cross-sectional profile is capable of ensuring additional focusing of preset radiation fractions of the linear source (1) in the focal point F.