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Abstract
High repetition rate free-electron lasers (FEL), producing highly intense extreme ultraviolet and x-ray pulses, require new high power tunable femtosecond lasers for FEL seeding and FEL pump-probe experiments. A tunable, 112 W (burst mode) optical parametric chirped-pulse amplifier (OPCPA) is demonstrated with center frequencies ranging from 720–900 nm, pulse energies up to 1.12 mJ and a pulse duration of 30 fs at a repetition rate of 100 kHz. Since the power scalability of this OPCPA is limited by the OPCPA-pump amplifier, we also demonstrate a 6.7–13.7 kW (burst mode) thin-disk OPCPA-pump amplifier, increasing the possible OPCPA output power to many hundreds of watts. Furthermore, third and fourth harmonic generation experiments are performed and the results are used to simulate a seeded FEL with high-gain harmonic generation.
Highlights
The superconducting soft X-ray free-electron laser FLASH [1, 2, 3] delivers FEL pulses in the wavelength range from 4 to 90 nm for user experiments
All these measurements have been performed in simultaneous operation with FLASH1
Even with a factor 5 difference in charge between FLASH1 and FLASH2 an independent setup of both beamlines is possible. Such a setup is challenging since the injector laser beam size at the photo-cathode can currently not be chosen independently but in future it is planed to modify the laser beamline to allow different beam sizes. This will further increase the flexibility of the setup
Summary
This content has been downloaded from IOPscience. Ser. 874 012023 (http://iopscience.iop.org/1742-6596/874/1/012023) View the table of contents for this issue, or go to the journal homepage for more. You may be interested in: Simultaneous operation of two soft x-ray free-electron lasers driven by one linear accelerator B Faatz, E Plönjes, S Ackermann et al An optical parametric chirped-pulse amplifier for seeding high repetition rate free-electron lasers H Höppner, A Hage, T Tanikawa et al Performance measurements on NIF beamlines for future experiments to support polar direct drive J K Crane, B Kruschwitz, S T Yang et al AMO science at the FLASH and European XFEL free-electron laser facilities J Feldhaus, M Krikunova, M Meyer et al Current status and future perspectives of accelerator-based x-ray light sources Takashi Tanaka The soft x-ray free-electron laser FLASH at DESY: beamlines, diagnostics and end-stations K Tiedtke, A Azima, N von Bargen et al DiamHond and ISIS get extra beamlines Matin Durrani Studying planetary matter using intense x-ray pulses K Appel, M Nakatsutsumi, A Pelka et al Comparison of Multi-Beam and Single-Beam Cytofluorometers for an Automated Screening System in Gynecologic Cytology Ken-ichi Fujii and Norihito Suzuki. J Ronsch-Schulenburg, B Faatz, K Honkavaara, M Kuhlmann, S Schreiber, R Treusch, M Vogt
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