We report an experimental investigation of the absorption and ablation characteristics of the high-temperature polymer Upilex polyimide, using a line-tunable TEA laser. It is demonstrated that excellent quality through-holes (vias) can be produced in thin films of Upilex when the laser is tuned to a strongly absorbed wavelength as a result of thermal decomposition produced by laser heating of the bulk polymer. For weakly absorbed wavelengths, transmission and probe beam deflection measurements reveal an incubation effect in the ablation which is thought to be related to particulate contamination in the film.
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Dyer et al. (1996) studied this question.
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