Contact element for laser machining

An optical contact element for coupling a laser processing device to an object to be processed, wherein

• the laser processing device focuses a scanned laser beam through a surface of the object into a certain region of the object and
• the contact element comprises an entrance side that receives the scanned laser radiation and an exit side imparting a defined surface curvature to the surface of the object upon contact therewith,
• wherein
• a diffractive optical element is arranged on the entrance side, and the diffractive optical element reduces the angle of incidence of the laser radiation on the surface of the object.

A laser processing device comprising:

• a contact element including an entrance side that receives scanned laser radiation and an exit side imparting a defined surface curvature to the surface of an object upon contact therewith;
• a diffractive optical element arranged on the entrance side;
• wherein the diffractive optical element reduces the angle of incidence of the laser radiation on the surface of the object;
• focusing optics arranged preceding the contact element, said focusing optics focusing bundles of the laser beam into focal points located in the object;
• wherein the focusing optics comprise a dispersive lens increasing the angle of deflection and a second diffractive optical element gathering the bundles coming from the dispersive lens.

A laser processing device comprising:

• means for transmitting scanned laser radiation;
• means for imparting a defined surface curvature to the surface of an object upon contact therewith;
• means for diffractive reduction of an angle of incidence of the laser radiation on the surface of the object;
• means for focusing bundles of the laser radiation into focal points located in the object;
• wherein the means for focusing comprises means for increasing the angle of deflection and means for diffractive gathering of the bundles coming from the means for increasing the angle of deflection.