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Opt Express. 2009 Jul 20;17(15):13116-21.

Non-thermal ablation of expanded polytetrafluoroethylene with an intense femtosecond-pulse laser.

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  • 1Institute for Chemical Research, Kyoto University, gokasho, Uji, Kyoto 611-0011, Japan.


Ablation of expanded polytetrafluoroethylene without disruption of the fine porous structure is demonstrated using an intense femtosecond-pulse laser. As a result of laser-matter interactions near ablation threshold fluence, high-energy ions are emitted, which cannot be produced by thermal dissociation of the molecules. The ion energy is produced by Coulomb explosion of the elements of (-CF(2)-CF(2)-)(n) and the energy spectra of the ions show contributions from the Coulomb explosions of the ions rather than those of thermal expansion to generate high-energy ions. The dependence of ion energy on the laser fluence of a 180-fs pulse, compared with that of a 400-ps pulse, also suggests that the high-energy ions are accelerated by Coulomb explosion.

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