Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 40: Ultrashort laser pulses I

Q 40.6: Vortrag

Donnerstag, 20. März 2014, 11:45–12:00, DO26 207

High-order harmonic generation with mixed infrared laser fields — •Paul Weber, Bernd Schütte, Songhee Han, Marc J. J. Vrakking, and Arnaud Rouzée — Max-Born-Institut, Max-Born-Strasse 2A 12489 Berlin, Germany

High harmonics generation (HHG) in inert gases with a femtosecond laser is an established method for generating ultrashort XUV pulses. Using a longer wavelength driver for the high harmonic generation process allows to extend the maximum photon energy from the XUV range into the soft x-ray regime at the cost of a large decrease of photon flux. To compensate for this low efficiency, we have investigated the possibility to produce a bright high harmonic source in the soft X-ray regime by mixing a near-infrared 800 nm laser field with an additional 1300 nm pulse. We show experimentally the generation of a high photon yield across the whole energy range extending to 180 eV. Optimal phase matching is obtained for a long focus geometry and high pressure (500 mBar) in a neon gas cell. Our experiment investigates in detail how the mixed fields combine for different relative delay times and affect the strong field process leading to high harmonic generation. The possibility to generate bright soft X-ray attosecond pulses with two-color high harmonics generation will be discussed as well.