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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