Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Attosecond Physics I
A 15.6: Vortrag
Mittwoch, 10. März 2010, 17:45–18:00, F 107
High-order harmonic generation by ultra-short pulses from filamentation — •Daniel S. Steingrube1,2, Emilia Schulz1,2, Thomas Binhammer3, Tobias Vockerodt1,2, Uwe Morgner1,2, and Milutin Kovacev1,2 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — 2QUEST, Centre for Quantum Engineering and Space-Time Research, Welfengarten 1, Hannover, Germany — 3VENTEON Laser Technologies GmbH, 30167 Hannover, Germany
High-order harmonics with application to attosecond pulse generation are commonly generated by pulses which are previously compressed in hollow core fibers. An alternative promising scheme for pulse compression is based on filamentation. Therefore, 30-fs-pulses from a commercial amplifier system are focused into a filamentation cell filled with argon. An octave spanning spectrum from 400 to 900 nm is obtained which yields pulses with duration below 7 fs measured with SPIDER. The white light core of the filamented output beam contains an energy of 0.3 mJ.
The compressed pulse is applied for high-order harmonic generation (HHG) which is performed in a semi-infinite gas cell setup after dispersion compensation using double chirped mirrors (DCM). The resulting spectra are presented for different generating gas media as xenon, argon, and neon. The spectra are spectrally broadened compared to those generated by the 30-fs-pulse. Moreover, the cut-off energy of the generated spectra is investigated for different pulse durations which are applied by varying the number of bounces on the DCMs.