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Emission of high energy gamma rays via the non-linear inverse Comptonscattering process (ICS) in interactions of ultra-intense laser pulses withthin solid foils is studied using particle-in-cell simulations. It is shownthat the angular distribution of the ICS photons has a forward-orientedtwo-directional structure centred at an angle $\vartheta = \pm 30^\circ$, avalue predicted by a theoretical model based on a standing wave approximationto the electromagnetic field in front of the target, which only increases atthe highest intensities due to faster hole boring, which renders theapproximation invalid. The conversion efficiency is shown to exhibit asuper-linear increase with the driving pulse intensity. In comparison toemission via electron-nucleus bremsstrahlung, it is shown that the higherabsorption, further enhanced by faster hole boring, in the targets with loweratomic number strongly favours the ICS process.

Inverse Compton scattering from solid targets irradiated by ultra-short laser pulses in the $10^{22}-10^{23}\,\mathrm{W/cm^2}$ regime