Device and method for laser processing

A device for laser processing, the device comprising:

• a laser comprising a resonator, the resonator being configured to generate a laser beam with a predetermined caustic during operation of the device;
• and
• an optical element to transform a laser beam generated by the resonator into a transformed laser beam having an annular intensity distribution in a plane perpendicular to a propagation direction of the transformed laser beam during operation of the device, wherein the optical element has a vortex structure configured to cause the transformed laser beam to have an azimuthal phase pitch such that the transformed laser beam has the annular intensity distribution,
• wherein the annular intensity distribution extends along the propagation direction of the transformed laser beam, and has, at a minimum diameter of a caustic of the transformed laser beam, a ring width, the ring width being defined as a difference between an inner ring radius and an outer ring radius, wherein the inner ring radius and the outer ring radius correspond to positions along a radial direction of the transformed laser beam at which a beam intensity is 50% of a maximum beam intensity, and
• wherein a ratio of the ring width to a beam radius of the transformed laser beam at the minimum diameter of the caustic is less than 0.6, the beam radius being determined based on the second moment of the annular intensity distribution.