The present invention relates to an apparatus (1) for generating a rotating laser beam (5) which may used for various applications including welding, cutting, drilling or ablation of materials. More particularly, the apparatus according to the present invention is able to produce a fast rotating and accurate laser beam, because the main optical device (100) that is rotated consists of a first reflecting surface (102) rotating about an axis (X1) at least a second reflecting surface (26), said first reflecting surface (102) intented to redirect said laser beam into the direction of the second reflecting surface (26), and a rotating lens (107) of optical axis (X2) arranged to be tiltable, such that said optical axis (X2) is able to be angled with respect to said axis (X1).