Microscopic phenomena found within enclosed surface laser ablation of 20 nm thick aluminium films |
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Authors: | R Stewart L Li R Isherwood |
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Institution: | a Department of Mechanical, Aerospace and Manufacturing Engineering, Laser Processing Research Centre, University of Manchester Institute of Science and Technology Manufacturing Division (UMIST), P.O. Box 88, Manchester M60 1QD, UK;b De La Rue Limited, Overton Mill, Overton, Hants, UK |
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Abstract: | This paper investigates the microscopic features which occur when a four-layered film is ablated using Q-switched Nd:YAG laser. The four-layered films consist of a vacuum-deposited aluminium layer (0.02 μm) upon an oriented polypropylene (OPP) film (30 μm) which has been laminated using an inert adhesive and a second OPP film. Laser radiation is absorbed principally by the aluminium layer, melting and/or vaporising it. Upon cooling, the aluminium layer is rearranged into discrete microscopic particles, which give laser-treated areas of the film a transparent appearance. Within the films are found microscopic features, which can be divided into three distinct types: aluminium demetallisation features, polymer distortion features and particle features. Features from each of these categories can exist within a single laser track depending upon the laser parameters used for transparentisation. |
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Keywords: | Laser Ablation Aluminium Enclosed Nd:YAG Polymer Film Foil Confined |
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