Dual excimer and CO2 laser etching studies of polyethylene terephthalate |
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| Authors: | R K Al-Dhahir P E Dyer J Sidhu C Foulkes-Williams G A Oldershaw |
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| Institution: | (1) Department of Applied Physics, School of Engineering and Computing, University of Hull, HU67RX Hull, UK;(2) School of Chemistry, University of Hull, HU67RX Hull, UK;(3) Present address: British Aerospace PLC, FPC 267, P.O. Box 5, BS12 7QW Bristol, UK;(4) Present address: Lumonics Ltd. (U.K.), CV21 1QN Rugby, UK |
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| Abstract: | Polyethylene terephthalate (PET) films preheated with a pulsed CO2 laser have been ablatively etched with an XeCl laser. The observed reduction in ablation threshold, from 170 to 140 mJ cm–2, is consistent with a thermal mechanism for XeCl laser ablation of PET. Transient changes in the UV absorption coefficient of PET caused by heating with pulsed CO2 laser radiation have also been studied and a significant increase in absorption observed at  308 nm. Permanent changes in the ultraviolet absorption of PET following exposure to low fluence XeCl laser radiation are also reported. |
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| Keywords: | 82 50 - M 42 60 - V |
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