Patent ID: 9618754
Date: 2017-04-11
CPC Classifications: B23K,G02B,H01S

Claim:
1. An optical system for forming a final image of a non-circular light source, outputting a beam along a path, on a workpiece, wherein the final image has a desired non-circular cross-section and a desired size B, the optical system comprising: a positive lens processing the beam such that an initial waist of the beam and an initial non-circular image of the non-circular light source are formed along the path with the initial non-circular image being spaced downstream from the waist at a desired distance; an optical telescope including spaced upstream and downstream lenses which are located along the path downstream from the initial non-circular image, the upstream lens being configured to form an imaginary image of the non-circular light source and an imaginary waist of the beam, wherein the desired distance between the initial image and waist is such that the imaginary image and waist are substantially coplanar upstream from the downstream lens, the imaginary image being formed with a size A different from the desired size B; and an F-theta lens spaced downstream from the downstream lens of the telescope along the path so that  with F