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Ionization by relativistically intense laser pulses of finite duration isconsidered in the framework of strong-field quantum electrodynamics. Our mainfocus is on the formation of ionization supercontinua. More specifically, whenstudying the energy distributions of photoelectrons ionized by circularlypolarized pulses, we observe the appearance of broad structures lacking theinterference patterns. These supercontinua extend over hundreds of drivingphoton energies, thus corresponding to high-order nonlinear processes. Thecorresponding polar-angle distributions show asymmetries which are attributedto the radiation pressure experienced by photoelectrons. Moreover, our timeanalysis shows that the electrons comprising the supercontinuum can form pulsesof short duration. While we present the fully numerical results, theirinterpretation is based on the saddle-point approximation for the ionizationprobability amplitude.

Supercontinuum in ionization by relativistically intense and short laser pulses: ionization without interference and its time analysis