Abstract: The invention concerns a device for optically transforming at least a radiation beam having a width extending in the plane X-Y. The device including optical elements provided with optically active interfaces, arrange in the radiation path. So as to obtain a more homogeneous intensity distribution in the output radiation beam and minimize internal losses, the invention includes at least one optical element in the form of a continuous angular transformation element including an optical interface having, along the x axis, an inclination continuously varying in the radiation direction, relative to the Y axis. The invention further concerns a method for continuously transforming a beam width extending in the X-Y plane, at least in the direction X, with defined divergence distribution.