Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 6: Ultrashort Laser Pulses: Generation I

Q 6.8: Talk

Monday, March 8, 2010, 15:45–16:00, F 342

Temporal Pulse Control and the Coherent Addition of Laser Pulses at a Multi-10-TW Diode Pumped Yb:Glass Laser. — •Marco Hornung, Ragnar Boedefeld, Alexander Kessler, Matthias Schnepp, Rico Wachs, Sebastian Keppler, Alexander Saevert, Joachim Hein, and Malte C. Kaluza — Institut für Optik und Quantenelektronik, FSU Jena, 07743 Jena, Deutschland

We present a detailed characterization of the dispersion management in the diode-pumped Yb:Glass CPA laser system Polaris, in order to minimize the pulse duration and to maximize the peak intensity. A novel method for the alignment routine of a tiled grating compressor is described as well as a controlling method for the coherent addition of multi-10-TW laser pulses. The parallel alignment of the gratings is accomplished by observing the far-field of a tunable cw-laser. The coherent addition of two beam-parts is monitored by a spectrally resolved far-field measurement and demonstrated with two beam-parts generated by using a tiled grating compressor. These techniques are easy to implement in any setup, cost effective and directly and intuitive to analyze. Using our alignment procedure for the tiled-grating compressor we achieve nearly diffraction limited far-field profiles of the laser pulses and an almost bandwidth limited pulse duration. With the Polaris system we reproducibly generate peak intensities in excess of 8×10¹⁹ W/cm² which characterizes Polaris as a powerful tool for high-intensity laser-matter interaction experiments.