Università Cattolica del Sacro Cuore

Monocromators for ultrafast pump-probe experiments in the extreme-ultraviolet

Seminario  1 aprile 2016
Aula: Sala Riunioni -  Ore: 12.00
Via Musei 41, Brescia

Monocromators for ultrafast pump-probe experiments in the extreme-ultraviolet

Introduce:
dott. Claudio Giannetti
Università Cattolica del Sacro Cuore

Interviene:
prof. LUCA POLETTO
CNR-Institute of Photonics and Nanotechnologies, Padova, Italy

Abstract
I will discuss the design and realization of beamlines for ultrafast monochromatic pulses in the extreme ultraviolet, that are generated through high-order laser harmonics. The aim of such beamlines is the realization of pump-probe experiments with temporal resolution in the range of few femtoseconds. The broadband generated radiation is monochromatized by selecting one of the laser harmonics through a grazing-incidence grating monochromator. The operation with dispersive optics gives a pulse-front tilt that increases the duration of the monochromatic pulse beyond the Fourier limit, typically in the scale of hundreds of femtoseconds. To retrieve the temporal resolution in the range of few femtoseconds, configurations able to compensate such pulse-front tilt have to be adopted. The different configurations available to realize so-called time-delay compensated monochromators will be discussed. Some experimental results obtained in operating beamlines will be presented.



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