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PublisherThe University of Arizona.
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AbstractThe objective of this Thesis is to design a scan lens for a long wave infrared laser marking system. The system is comprised of a laser source emitting a collimated beam coupled with a 14mm aperture dual axis galvanometer scanning system capable of scanning a range ± 11° (mechanical). Multiple scan lens options will be considered. Each scan lens will be optimized to maximize peak irradiance and operate at, or near, the diffraction limit over a 210x110 mm 'plus' shaped field. Unintended distortion evident in some lens designs and will be compensated for by developing equations that allowed the proprietary imaging algorithm to adjust the angle of the scanning mirror appropriately to achieve an undistorted image. The accuracy of the distortion correction will be within 1% of the shortest image dimension. Commercially available scan lenses are designed for generic scanning systems with no apriori knowledge of the imaging model and are typically available in arbitrary focal length increments. As a result, use of off the shelf scan lenses result in sub-optimal performance. This thesis presents background information on galvanometer based scanning systems followed by a review of classical scan lenses. The imaging application and systems constraints for the marking system are defined. The steps taken to design and optimize a conventional, aspheric, and F-Theta scan lens are described, and their performances are compared with respect to the design requirements. The Conventional scan lens coupled with a distortion correction equation was found to offer the best performance to cost ratio and was deemed the most appropriate lens for the marking system.
Degree ProgramGraduate College