Transition of proton energy scaling using an ultrathin target irradiated by linearly polarized femtosecond laser pulses.

摘要: Particle acceleration using ultraintense, ultrashort laser pulses is one of the most attractive topics in relativistic laser-plasma research. We report proton and/or ion intensity range 5×10(19) to 3.3×10(20) W/cm2 by irradiating linearly polarized, 30-fs on 10-to 100-nm-thick polymer targets. The energy scaling with respect and target thickness examined, a maximum 45 MeV obtained when 10-nm-thick irradiated W/cm2. explained hybrid mechanism including normal sheath acceleration, radiation pressure Coulomb explosion assisted-free expansion. transition from I(1/2) I observed as consequence mechanism. experimental results are supported two- three-dimensional particle-in-cell simulations.