Patent ID: 8519368

Claim:
A device for generating optical radiation by means of an electrically operated discharge, comprising at least two electrodes ( 1 , 2 ) arranged in a discharge space at a distance from one another which allows ignition of a plasma ( 15 ) in a gaseous medium between said electrodes ( 1 , 2 ), a device for applying a liquid material ( 6 ) to a surface moving through, said discharge space and an energy beam device adapted to direct one or several pulsed energy beams onto said surface evaporating said applied liquid material ( 6 ) at least partially thereby producing at least part of said gaseous medium, wherein said energy beam device is designed to apply pulses ( 9 ) of said pulsed energy beam(s) at different lateral locations with respect to a moving direction of said surface, such that a periodically repeating pattern of impact points is achieved at said surface during movement of said surface.