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Title: High power laser systems with actuated beam delivery
Author: Baker, Ian Andrew
ISNI:       0000 0004 7656 0186
Awarding Body: Heriot-Watt University
Current Institution: Heriot-Watt University
Date of Award: 2017
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Lasers with kilowatt average powers and pulse durations in the nanosecond range are used for a variety of applications requiring surface alteration or removal. A novel surface removal application required development of a pulsed laser beam delivery system to track and target the position of a substrate to deliver a shaped homogenised beam to its surface. A solution is investigated using a fibre delivered multi-spatial mode laser source a seam tracking vision system, customised electronics and software algorithms, an inline Risley prism optical actuator and a beam shaping optical delivery system. The system has been modelled from the laser cavity through to final beam delivery and this approach yields a novel, compact size currently not available commercially and a highly homogenised laser beam, free of laser speckle, with edge widths of <160 µm. Beam shaping for spot sizes in the range of 0.3 mm - 3.0 mm, actuation ranges of up to ±10 mm and tracking accuracies of <50 µm are demonstrated when tracking substrate surface features of size >50 µm. The system reduces substrate placement tolerances and delivers the laser power reproducibly to the target region. At the time of writing, three tracking systems are utilised in heavy industry environments producing, to date, a cumulative output of six million substrates. In addition, four systems utilising the optical techniques detailed in this thesis have also been also operating in heavy industrial environments since 2015
Supervisor: Hay, Nick ; Reid, Derryck Sponsor: Not available
Qualification Name: Thesis (Eng.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available