Spherical lens element GCO-31 series

F-thetavisibleinfrared

F-theta Lenses are plane field objectives, which are commonly used in combination with XY galvanometer scanner. Contrary to a normal lens which focuses a input collimated beam on a spherical image plane, a F-theta lens focuses on a flat image surface.At the same time,it maintains almost constant spot size over the entire field when the input beam scans with input angle θ。 The position of the spot on the image plane is directlyproportional to the scan angle, i.e. F-theta condition:y ‘=f ’*θ Daheng F-theta lens series (GCO-31) fulfils the F-theta condition better than 0.1%. For laser material processing, F-theta lenses guarantee the best processing result over the entire scan field. These lenses contribute to production lines, especially for sophisticated applications. The wide range of applications includes: ◆ Drilling and fine cutting of metals and ceramics ◆ Plastic welding ◆ Marking ◆ Cleaning for treatment or restoration KEY PARAMETERS ◆ The overall scan angle,θmax, refers to the maximum diagonal scan angle. ◆ The entrance beam diameter, φbeam(1/e2), is the beam diameter where the optical intensity is 13.5% of the peak intensity of the laser beam. ◆ Factor of apodisation （FAP）is the ratio of the beam diameter, φbeam, and the entrance pupil,φaper , of the F-theta lens. FAP is used for calculation of the minimal possible focus spot size. ◆ Diffraction value M2 refers to the ability of focusing laser light, defined by ISO11146 standards. It is the ratio of the divergence angle of a laser beam to the divergence angle of an ideal Gaussian beam. A Gaussian beam would provide the smallest possible focus spot size, which M2 value is 1.