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We present the main features of CITIUS, a new light source for ultrafastscience, generating tunable, intense, femtosecond pulses in the spectral rangefrom IR to XUV. The XUV pulses (about 10^5-10^8 photons/pulse in the range14-80 eV) are produced by laser-induced high-order harmonic generation in gas.This radiation is monochromatized by a time-preserving monochromator, allowingalso to work with high-resolution bandwidth selection. The tunable IR-UV pulses(10^{12}-10^{15} photons/pulse in the range 0.4-5.6 eV) are generated by anoptical parametric amplifier, which is driven by a fraction of the same laserpulse that generates high order harmonics. The IR-UV and XUV pulses followdifferent optical paths and are eventually recombined on the sample forpump-probe experiments. The new light source will become the fulcrum of a newcenter located at the University of Nova Gorica, active in a wide range ofscientific fields, including materials science, catalysis, biochemistry andmagnetism. We also present the results of two pump-probe experiments: with thefirst one, we fully characterized the temporal duration of harmonic pulses inthe time-preserving configuration; with the second one, we demonstrated thepossibility of using CITIUS for studying of ultra-fast dynamics.

CITIUS: an IR-XUV light source for fundamental and applied ultrafast science