Author: Kurdi, G.
Paper Title Page
TUIANO01
 Seed Laser Configurations for Advanced Pump-probe Schemes With FELs  
 
  • M.B. Danailov, P. Cinquegrana, A.A. Demidovich, R. Ivanov, G. Kurdi, I. Nikolov, P. Sigalotti
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  This work presents novel techniques developed and under development at the FERMI FEL for implementing new modalities of FEL operation allowing pump-probe experiments with practically no jitter between the pump and probe pulses. One of the proposed techniques takes advantage of the fact that in seeded FELs the exact time at which FEL pulses are generated is locked to the one of the seed laser, and uses a part of the seed laser light for pump-probe experiments. We are presenting the design of a scheme implementing this idea at the FERMI FEL. We address the design of the optical beam transport as well as of the high performance feedbacks driven by optically derived error signals needed to cancel the temporal and pointing drifts. Another new technique, described for the first time to our knowledge, is the use of a double-pulse seed laser which seeds the same electron bunch and allows to generate two FEL pulses with tunable time delay and wavelengths. First experimental results are presented.  
 
TUOBNO02
 Optical-EUV Pump and Probe Experiments With Variable Polarization on the Newly Open LDM Beamline of FERMI@Elettra  
 
  • P. Finetti, R. Borghes, C. Callegari, P. Cinquegrana, M.B. Danailov, A.A. Demidovich, C. Fava, S. Gerusina, C. Grazioli, R. Ivanov, G. Kurdi, M. Lonza, N. Mahne, I. Nikolov, L. Pivetta, O. Plekan, L. Raimondi, P. Sigalotti, C. Svetina, D. Zangrando, M. Zangrando
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • L. Avaldi, P. Bolognesi, M. Coreno, P. O’Keeffe
    CNR - IMIP, Trieste, Italy
  • G. De Ninno
    University of Nova Gorica, Nova Gorica, Slovenia
  • M. Di Fraia
    Università degli Studi di Trieste, Trieste, Italy
  • M. Ilchen, T. Mazza, M. Meyer, A.J. Rafipoor
    XFEL. EU, Hamburg, Germany
  • K. Ueda
    Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Sendai, Japan
  
  Two color experiments are now available to users at the low-density matter beamline (LDM) operating at the Free Electron Laser (FEL) source FERMI@Elettra [1]. The seeded FEL method used at FERMI allows generation of high power, coherent pulses in the femtosecond regime, with a high level of shot-to-shot stability. Variable polarization is also available. LDM is dedicated to atomic, molecular and cluster physics. The LDM end-station, equipped with a velocity map imaging and a time-of-flight detector [2], is an ideal tool to characterize fast multiphoton processes. LDM was open to users in December 2012 and in February 2013 performed its first pump and probe experiment on photoionization of atomic He and generation of spectral sidebands. The FERMI FEL-1 source, delivered EUV photons with several tens of microjoule per pulse (about 100 fs wide) in a tunable wavelength range from 65 to 20 nm, while the 780 nm, optical pulses were from the same Ti:sapphire laser used to form the FEL seed pulse. This paper gives details about the pump and probe experimental setup and shows the straightforward use of the pump and probe data to measure the FEL pulse width.
[1] E. Allaria et al., Nature Photonics, 6, 699 (2012).
[2] V. Lyamayev et al., J. Phys B: At. Mol. Opt. Phys.-B/466820/SPE/12380
 		 
slides icon Slides TUOBNO02 [3.956 MB]