Enhanced generation of fast protons from a polymer-coated metal foil by a femtosecond intense laser field

Kishimura, Hiroaki; Morishita, Hiroto; Okano, Yasuhisa H.; Okano, Yasuaki; Hironaka, Yoichiro; Kondo, Ken-ichi; Nakamura, Kazutaka G.; Oishi, Yuji; Nemoto, Koshichi
October 2004
Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2736
Academic Journal
The results of generation of fast protons from 5-μm-thick copper foil targets by 60 fs laser irradiation at 1.5×1017 W/cm2 are presented. Both polyvinylmethylether (PVME)-coated and uncoated copper foil targets are examined. Fast protons are measured using a Thomson mass spectrometer and maximum proton energies are 570 and 280 keV for the PVME-coated and the uncoated target, respectively. The intensity of fast protons with energy of 160 keV from the PVME-coated target is approximately 80-fold higher than that from the uncoated target.


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