Ablation of polymer films by a femtosecond high-peak-power Ti:sapphire laser at 798 nm

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Abstract
Femtosecond infrared pulses from an ultrashort high‐peak‐power Ti:sapphire laser were successfully utilized for ablation of polymer films such as polytetrafluoroethylene, tetrafluoro‐ ethylene‐hexafluoropropylene copolymer, and polyimide. Good agreement between experimental data and calculations from a model suggested that simultaneous absorption of three photons for polyimide and five photons for tetrafluoroethylene‐hexafluoropropylene copolymer predominated over the other absorptive channels and that such a multiphoton absorption was induced efficiently.