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The Bernina instrument at the SwissFEL Aramis hard X‐ray free‐electron laser is designed for studying ultrafast phenomena in condensed matter and material science. Ultrashort pulses from an optical laser system covering a large wavelength range can be used to generate specific non‐equilibrium states, whose subsequent temporal evolution can be probed by selective X‐ray scattering techniques in the...
Sub-femtosecond excitation of inner-shell electrons is a prerequisite step toward time domain “pump-probe” study of core-hole dynamics. By using a few cycles 1800nm source, we show that the recolliding electron might provide this necessary step.
We present a short-pulse pumped optical parametric amplifier (OPA) with a broadband spectrum from 670 nm to 1000 nm, supporting 5.7 fs pulses with > 32 % pump-to-signal conversion efficiency resulting in pulse energies of 2.5 mJ.
Typical time-scale for excited inner-shell processes is in the range between few femtosecond to sub-femtosecond. Here we present a tool to excite such processes with sub-femtosecond time resolution, enable time-domain studies of these processes.
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