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Q: Fachverband Quantenoptik und Photonik
Q 43: Poster II
Q 43.30: Poster
Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof
Hollow fiber pulse compressor for multi-mJ laser pulses — •Timo Rohrlapper1, Martin Kretschmar1,2, Peter Simon3, Uwe Morgner1,2,4, Milutin Kovacev1,2, and Tamas Nagy1,3 — 1Leibniz Universität Hannover, Institut für Quantenoptik, Welfengarten 1, Hannover — 2QUEST, Centre for Quantum Engineering and Space-Time Research, Welfengarten 1, Hannover — 3Laser-Laboratorium Göttingen e.V., Hans-Adolf-Krebs-Weg 1, 37077 Göttingen — 4Laser Zentrum Hannover e.V., Hollerithallee 8, Hannover
Lasers delivering few-cycle pulses (< 5 fs) play a prominent role in contemporary ultrafast science. Such lasers usually incorporate a spectral broadening stage, most frequently a hollow fiber compressor. Although this is an established technique which works well to sub-mJ pulses, it is still a great challenge to extend it to multi-mJ pulse energies. Such an energy scaling requires long hollow fibers. With our novel stretched flexible hollow fiber concept we can freely scale the length of the waveguide. Here we present the first experimental results of spectral broadening of ~2 mJ pulses with such fibers. By using a 3-m long fiber of 450 micron inner diameter filled with helium we could generate an octave-spanning spectrum with 1.5 mJ pulse energy giving a very high energy transmission of ~70%. The achieved spectral width supports 3.4 fs pulse duration.