388 W multipass cell broadening supporting few-cycle pulse duration

High-power, few-cycle lasers are viable tools, e.g. in time-resolved spectroscopy [1] and nanoscale imaging [2] . No laser emits such pulses directly due to its limited gain bandwidth and, hence, either nonlinear pulse compression in fibers [3] or optical parametric amplification [4] are commonly applied to generate few-cycle pulses.