Laser etching and cleaning of material surfaces

Pao Yue-kong Library Electronic Theses Database

Laser etching and cleaning of material surfaces


Author: Lo, Yiu-kwong
Title: Laser etching and cleaning of material surfaces
Degree: M.Sc.
Year: 1998
Subject: Lasers -- Industrial applications
Surface preparation
Surface contamination
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Applied Physics
Pages: iv, 62 leaves : ill. ; 29 cm
Language: English
InnoPac Record:
Abstract: Laser etching and cleaning technology has been demonstrated to be a useful tool to rid the contaminants from a surface. The laser fluence required to remove the contaminants but without damaging the bulk substrate is critically depended on not only the laser wavelength but the absorption coefficient and the ablation threshold of the contaminants as well as the substrate materials. We have shown, in our studies, that for surface contaminants, such as polymeric coatings with a relatively low absorption coefficient at the laser wavelength, it is very difficult to produce good and effective cleaning. However, we have demonstrated that by introducing a metallic buffer layer, which has a much higher absorption coefficient, efficient and high quality cleaning of polymeric coatings such as Polyvinyl Alcohol (PVA), can be achieved.

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