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The use of ultrathin solid foils offers optimal conditions for acceleratingprotons from laser-matter interactions. When the target is thin enough thatrelativistic self-induced transparency (RSIT) sets in, all of the targetelectrons get heated to high energies by the laser, which maximizes theaccelerating electric field and therefore the final ion energy. In this work,we first investigate how ion acceleration by ultraintense femtosecond laserpulses in transparent CH$_2$ solid foils is modified when turning from normalto oblique ($45^\circ$) incidence. Due to stronger electron heating, we findthat higher proton energies can be obtained at oblique incidence but in thinneroptimum targets. We then show that proton acceleration can be further improvedby splitting the laser pulse into two half-pulses focused at opposite incidenceangles. An increase by $\sim 30\,\%$ in the maximum proton energy and by afactor of $\sim 4$ in the high-energy proton charge is reported compared to thereference case of a single normally incident pulse.

Effects of oblique incidence and colliding pulses on laser-driven proton acceleration from relativistically transparent ultrathin targets