Abstract
The availability of tunable, picosecond free-electron lasers operating with high efficiency in the mid-infrared opens a materials-processing regime qualitatively distinct from that accessed by femtosecond Ti:sapphire lasers, one which is characterized by a high spatio-temporal density of vibrational, rather than electronic, excitation. As an example of this novel materials-processing regime, we present new results on pulsed laser deposition of thin poly(tetrafluoroethylene) films. Films of poly(tetrafluoroethylene) were deposited by resonant (4.2 and 8.26 μm) and non-resonant (7.1 μm) infrared picosecond laser ablation from either a pressed powder target or a commercial bulk target. The films were smooth and crystalline and largely free of particulates without annealing. Infrared and X-ray photoelectron spectra indicated that the films retained the chemical properties of the starting material. Observations of the film properties are consistent with a steady-state ablation mechanism, possibly enhanced by non-linear absorption due to the high photon flux in the free-electron laser micropulses.
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81.05.Lg; 69.37.-d; 81.15.Fg
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Papantonakis, M., Haglund Jr., R. Picosecond pulsed laser deposition at high vibrational excitation density: the case of poly(tetrafluoroethylene). Appl Phys A 79, 1687–1694 (2004). https://doi.org/10.1007/s00339-004-2681-3
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DOI: https://doi.org/10.1007/s00339-004-2681-3