As a matter of fact, the use of a seed enables a fine control of the chirp and a spectro-temporal shaping of the FEL emission. Moreover, ultrashort wavelengths can be envisaged through schemes of high-gain harmonic generation and echo-enabled harmonic generation. We will present FEL simulations coupled with the study of a compressor in conical diffraction geometry.
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Hugo Dacasa, Benoît Mahieu, Marta Fajardo, Thuy T. T. Le, Lu Li, Eduardo Oliva, Philippe Zeitoun, "Chirped pulse amplification in x-ray free-electron lasers," Proc. SPIE 9589, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications XI, 95890G (22 September 2015);