Abstract

We observe the proton signals produced by laser interaction with thin-foil targets of polyimide and of copper. We change the thickness of the polyimide target to <TEX>$7.5{\mu}m$</TEX>, <TEX>$12.5{\mu}m$</TEX>, and <TEX>$50{\mu}m$</TEX>. High-energy protons with the maximum energy of <TEX>${\sim}2.3\;MeV$</TEX> from <TEX>$7.5{\mu}m$</TEX> thick polyimide are observed. This proton beam with the maximum energy of multi-MeV has various applications such as a proton shadowgraphy.

© 2009 Optical Society of Korea

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