FisMat2017 - Submission - View

Abstract's title: Four-wave-mixing experiments and beyond: The TIMER/mini-TIMER setups at FERMI
Submitting author: Laura Foglia
Affiliation: Elettra - Sincrotrone Trieste S.C.p.A
Affiliation Address: Strada Statale 14 - km 163,5 in AREA Science Park
Country: Italy
Oral presentation/Poster (Author's request): Poster
Other authors and affiliations: Filippo Bencivenga, Riccardo Mincigrucci, Alberto Simoncig, Michele Manfredda, Lorenzo Raimondi, Emanuele Pedersoli, Flavio Capotondi, Emiliano Principi, Marco Zangrando, Maya Kiskinova and Claudio Masciovecchio (Elettra - Sincrotrone Trieste S.C.p.A.) Andrea Calvi (Dipartimento di Fisica, UniversitĂ  degli Studi di Trieste) Riccardo Cucini and Nicola Mahne (IOM-CNR, Laboratorio TASC).

The development of free electron laser (FEL) sources, which provide extreme ultraviolet (XUV) and soft x-ray radiation of unprecedented coherence and almost transform-limited pulse structure, has opened up the realm of XUV/x-ray non‑linear optics. In particular, XUV four-wave-mixing (XFWM) experiments may allow, e.g., to probe correlations among low-energy excitations and core states, and to access the “mesoscopic” wavevector range (0.1-1 nm-1), inaccessible so far and fundamental to investigate nanostructures and disordered systems. Here we report on the latest advances and future developments of the TIMER setup at FERMI (Elettra, Italy) and of the test setup mini-TIMER (available at the DiProI end station), both specifically conceived for non-collinear XFWM experiments. In particular, we discuss the improvements on the beam transport of TIMER, that allowed the first all-XUV FWM experiments and the newly developed reflection scheme of mini-TIMER, that opened up the possibility of measuring opaque samples. Finally, TIMER and mini-TIMER are also suitable for time-resolved second order non-linear experiments, which are intrinsically surface sensitive due to symmetry restrictions, and hereby we discuss the foreseen extension to the XUV of interface specific probing of electronic processes, for example charge and energy transfer, with chemical specificity.