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In order to obtain high brightness electron bunches and generating high power, subpicosecond XUV radiation by SASE and/or seeded FEL, the laser pulses impinging onto the photocathode require special characteristics not only in terms of wavelength and delivered energy per pulse. Temporally and spatially shaped UV pulses are needed for preventing non linear space charge forces and then minimizing the electron emittance. In the EUROFEL program framework, our goal is to obtain few picosecond, 100 μJ laser pulses in the UV (266 nm) with a totally controlled and characterized longitudinal shape varying from the "beer can" profile to the "rotation ellipsoid" one. In this paper, a survey of the studies conceived for obtaining the desired goal on the KHz, Chirped Pulse Amplification (CPA)-based Ti:Sa laser system PLFA at CEA-Saclay, is shown. These latter deal with the amplitude and phase control of the stretched laser pulses issued from an amplifier before entering the compressor and the tripling unit. The work presents the theoretical background and stresses on the existing technological bottlenecks before showing various proposed experimental set-ups and preliminary promising results.
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