We present a compact experimental setup for performing attosecond-pump-infrared-probe experiments with long-time delay stability. The robustness of the setup is demonstrated over a two-day ...acquisition time in two-photon photoionization of argon in the photon-energy range 17−33 eV. The propagation of the input infrared pulse, as driving pulse for the high-order harmonic generation process and for the generation of the sidebands of the main photoelectron peaks, through the main optical components is simulated and discussed. Our setup allows us to perform attosecond experiments with an overall stability of ± 40 as.
SPARC (acronym of “Sorgente Pulsata ed Amplificata di Radiazione Coerente”, i.e. Pulsed and Amplified Source of Coherent Radiation) is a single pass free-electron laser designed to obtain high gain ...amplification at a radiation wavelength of 500 nm. Self-amplified spontaneous emission has been observed driving the amplifier with the high-brightness beam of the SPARC linac. We report measurements of energy, spectra, and exponential gain. Experimental results are compared with simulations from several numerical codes.
It is here discussed the design and the characterization of a compact spectrometer to be used at the FLASH facility (DESY, Hamburg) to acquire the spectral features of the free-electron-laser ...radiation in terms of high-harmonics content and shot-to-shot spectral changes. The instrument is sensitive in the 2–40
nm spectral region and very compact to be used in different beamlines. The optical design consists of an entrance slit, a spherical diffraction grating with variable groove spacing and an extreme-ultraviolet-enhanced CCD detector. The entire spectral range is covered by two interchangeable gratings installed on a rotating stage.
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