Stuttgart 2012 – scientific programme
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MO: Fachverband Molekülphysik
MO 14: Poster 2: Biomolecules, Electronic Spectroscopy, Experimental Techniques, Quantum Chemistry, Various Topics
MO 14.20: Poster
Wednesday, March 14, 2012, 16:30–19:00, Poster.IV
First time-resolved pump-probe experiments at PETRA III using a synchronized highly repetitive multi-frequency laser system — •Moritz Schlie1,2, Dennis Göries2, Benjamin Dicke2, Armin Azima1, Marek Wieland1, Jens Viefhaus2, Alke Meents2, and Markus Drescher1 — 1Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2Deutsches Elektronen Synchrotron, Notkestraße 85, 22609 Hamburg
To enable laser / X-ray pump-probe experiments at the new PETRA III synchrotron radiation facility at DESY, a synchronized laser system has been set up. Wavelengths ranging from 210 nm to 2600 nm are delivered at a high repetition rate of 130 kHz, thus allowing highly efficient experiments with flexible excitation schemes. The system is based on a commercial diode-pumped Yb:KGW laser with 6 W output power followed by an Optical Parametric Amplifier and Harmonic Generation modules. The laser is synchronized with one electron bunch in the ring. To this end, phase locked loops (PLL) lock the laser’s oscillator frequency (83 MHz) and its 6th harmonic to the PETRA III master oscillator (500 MHz) and its 6th subharmonic allowing furthermore the setting of fine and coarse delays. The synchronization- and delay-scheme are presented together with first time resolved experiments performed at beamline P11.