Patent ID: 7780654

Claim:
A device for radiating laser light onto a skin surface during a medical or cosmetic treatment comprising: a laser light source emitting the laser light; a hand piece including an optical coupling element having a light entrance surface facing toward the laser light source and a light exit surface configured to contact the skin surface during the treatment, wherein the laser light has an intensity distribution with a flat top shape at the light entrance surface and is guided by the optical coupling element from the light entrance surface to the light exit surface so that the intensity distribution of the laser light at the light exit surface has the flat top shape; the coupling element including a bundle of light guides having end sections ending at the light entrance surface on one side and at the light exit surface on an other side, the light guides being fused together, at least at the end sections, so as to avoid optically inactive intermediate spaces; wherein the coupling element has a longitudinal axis and a frustum-shaped section disposed between the light entrance surface and the light exit surface centrically to the longitudinal axis, wherein a circumference of the coupling element in a region between the light entrance surface and a smaller diameter of the frustum-shaped section has a diameter that is larger than the diameter of the light entrance surface and also larger than the smaller diameter of the frustum-shaped section, wherein each light guide in the bundle has a smaller cross-sectional area at the light entrance surface than at the light exit surface so that the light exit surface is different from the light entrance surface in geometrical profile and/or circumference, and wherein an angle of emergence of a laser light component from each light guide is smaller than an angle of entrance of the laser light component into the respective light guide.