Abstract
Energetic proton generation by irradiation of several kinds of tape targets by ultra-short high-power laser pulses was investigated in the intensity region around 1018W/cm2 and sub-pico second pulse duration. The maximum proton energy showed a dependence on the product of target thickness and mass density. The fast electrons should lose energy after passing through solid targets of high mass density, which was also con-firmed by a Monte Carlo simulation code, Geant4. A deformable mirror was successfully controlled to increase the maximum proton energy. Only 30mJ of laser energy was sufficiento generate 1 Me V protons.
