Author: Riedel, R.
Paper Title Page
Optical Afterburner for Naturaly Synchronized Pump-probe Experiments at FLASH  
  • N. Stojanovic, A. Al-Shemmary, D. Espeloer, T. Golz, R. Riedel, E. Schneidmiller, M.V. Yurkov
    DESY, Hamburg, Germany
  • M. Foerst
    CFEL, Hamburg, Germany
  • M. Gensch
    HZDR, Dresden, Germany
  • F. Tavella
    HIJ, Jena, Germany
  Funding: German Federal Ministry for Education and Research, project 05K10CHC and 05K12CH4
We employ so- called Optical Afterburner [*,**] principle to generate optical replica pulses of X-ray pulse at FLASH (Free Electron LASer in Hamburg). These pulses are naturally synchronized to the FEL pulses and share the same envelope and arrival time, with accuracy down to few femtoseconds. Because of this, Optical Afterburner pulses can be used for complete temporal diagnostics for FEL pulses. Because we shift diagnostics challenge from X-ray to visible range, this significantly simplifies detection. During pulse- duration measurement campaigns at FLASH, Optical Afterburner has been demonstrated as versatile and accurate tool to measure pulse duration of X-ray FEL pulses. In the most recent development we have amplified, Optical Afterburner pulses by three orders of magnitude and will used it in the X-ray/Visible pump-probe experiments for ultimate temporal resolution. We have demonstrated amplification concept at FLASH, where we reach pulse energies above 1uJ at 1MHz repetition rate.
* E.L. Saldin, E.A. Schneidmiller and M.V. Yurkov, Phys. Rev. ST Accel. Beams 13, 030701 (2010)
* Proceedings of IPAC2011, San Sebastián, Spain. THPC084
TUA02 A Review of High Power OPCPA Technology for High Repetition Rate Free-Electron Lasers 310
  • M.J. Prandolini, R. Riedel
    HIJ, Jena, Germany
  • M. Schulz
    DESY, Hamburg, Germany
  • F. Tavella
    SLAC, Menlo Park, California, USA
  High repetition rate free-electron lasers (FEL) require the development of new laser systems that have the ability to operate at high average power. Optical parametric chirped-pulse amplification (OPCPA) is presently the most promising method to fulfill these requirements. This technique has been used to demonstrate amplification up to tens of watts with a repetition rate in the range between tens of kHz to MHz in burst and continuous mode. We review the current OPCPA technology for systems operating around 800 nm; this includes various frontend options, pump amplifier technology and latests results, and we discuss the important requirements for achieving high power lasers in both burst and continuous operation.
Work supported by the Helmholtz Institute Jena and the Deutsches Elektronen-Synchrotron DESY in Hamburg.
slides icon Slides TUA02 [4.997 MB]