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TY - CONF AU - Koschitzki, C. AU - Chen, Y. AU - Good, J.D. AU - Groß, M. AU - Khazanov, E. AU - Krasilnikov, M. AU - Lang, T. AU - Loisch, G. AU - Mironov, S. AU - Niemczyk, R. AU - Stephan, F. AU - Winkelmann, L. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Status of Chirped Pulse Laser Shaping for the PITZ Photoinjector J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - The beam emittance at FEL facilities like European XFEL and FLASH is dominated by the emittance sources in the electron injector. Shaping of the laser pulses that are employed to release electrons from the cathode of a photo injector, was shown in theory to allow improved beam emittance starting from the electron emission process. At the photo injector test facility at DESY in Zeuthen (PITZ) a laser system capable of controlling the temporal and spatial profile of laser pulses is being set up to demonstrate the predicted emittance reduction experimentally. The presentation will show its current capabilities to provide temporally and spatially shaped laser pulses from a pulse shaper operating at infrared (IR) wavelengths. Furthermore, results from a shape preserving conversion into fourth harmonic ultra-violet (UV), as needed for the photo emission process, will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 437 EP - 439 KW - laser KW - electron KW - flattop KW - optics KW - simulation DA - 2019/11 PY - 2019 SN - "" SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-WEP050 UR - http://jacow.org/fel2019/papers/wep050.pdf ER -