Dresden 2011 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 14: Ultrakurze Laserpulse: Erzeugung 1

Q 14.3: Talk

Monday, March 14, 2011, 15:00–15:15, SCH 251

High-Harmonic Generation source for seeding FLASH — •M. Mittenzwey¹, A. Azima¹, J. Boedewadt¹, F. Curbis¹, H. Delsim-Hashemi¹, M. Drescher¹, U. Hipp¹, T. Maltezopoulos¹, V. Miltchev¹, M. Rehders¹, J. Roensch-Schulenburg¹, J. Rossbach¹, R. Tarkeshian¹, M. Wieland¹, S. Bajt², S. Duesterer², J. Feldhaus², T. Laarmann², H. Schlarb², S. Khan³, and R. Ischebeck⁴ — ¹University of Hamburg — ²DESY, Hamburg — ³DELTA, Dortmund — ⁴PSI, Villigen, Switzerland

The Free electron LASer in Hamburg (FLASH) is currently operated in the self-amplified spontaneous emission mode (SASE), producing photons in the XUV range. Due to the statistical nature of SASE the radiation shows intensity and spectral pulse-to-pulse fluctuations. Moreover, the electron acceleration process introduces arrival time fluctuations of the electron bunch at the undulator entrance, which leads to a temporal jitter of the XUV pulses. In order to reduce these fluctuations a seeding scheme for the electron bunch can be used. To this end, XUV seed pulses from a High-Harmonic Generation (HHG) source will be overlapped in space and time with the electron bunches. In this case the amplification process takes place within the seed pulse length leading to a radiation without temporal jitter, lower intensity- and spectral fluctuations, and full control over the pulse length. In this contribution the general design and first results of the seeding experiment at FLASH will be presented. In particular the HHG source will be explained in detail. This work is supported by the Federal Ministry of Education and Research under contract 05 ES7GU1.