We characterize a new table-top, tunable XUV source spanning 8 to 25 eV based on a femtosecond enhancement cavity. This source is designed to investigate correlated electron systems with angle and time resolved photoemission spectroscopy.
We propose and experimentally demonstrate the method of population transfer by piecewise adiabatic passage between two quantum states. Coherent excitation of a two-level system with a train of ultrashort laser pulses is shown to reproduce the effect of an adiabatic passage, conventionally achieved with a single frequency-chirped pulse. By properly adjusting… (More)