Patent ID: 8895893
Filing Date: 2014-11-25
Classification: B22F,B23K,B29C,Y02P

Abstract:
1. Process chamber for a processing of a material by means of a directed beam of electromagnetic radiation comprising: an optical element arranged in a plane for coupling the beam into the process chamber, wherein the optical element has a surface that is facing the inside of the process chamber, a wall section surrounding the optical element in said plane, wherein the wall section has a first section adjoining to a first side of the optical element, the first section being a slanted section the surface of which extends under an angle from said plane or a convex section which is convex with respect to the inside of the process chamber, and a second section adjoining the first section, the second section being a hollow section having the shape of a hollow cylinder section or any other shape forming a groove, an axis of the hollow cylinder section or groove extending substantially in parallel to the first side of the optical element, a first inlet for a gas, which is arranged at said first section at a position facing the optical element and which is directed substantially tangentially to the surface of the optical element, and a second inlet for a gas, which is arranged at a position at said second section opposite to the position where said second section adjoins said first section and which is directed substantially in the same direction as the first inlet.