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Schriever, Christian; Krok, Patrizia; Lochbrunner, Stefan; Riedle, Eberhard ORCID: 0000-0002-2672-5718 (2007): Tunable pulses from below 300 to 950 nm with durations down to 12 fs from a 2 MHz Yb-doped fiber system. The European Conference on Lasers and Electro-Optics 2007, 17 June 2007, Munich, Germany.
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For many applications in spectroscopy, imaging, and machining, ultrafast low energy pulses at a high repetition rate are required. Fiber based femtosecond lasers are promising sources, however, they are not tunable which limits their application areas. We developed a noncollinearly phase matched optical parametric amplifier (NOPA) [1] for high repetition rates that not only provides the necessary tunability but also shortens the pulses by more than a factor of 20. The NOPA is pumped by the output of a commercially available 2 MHz Ytterbium-doped fiber-oscillator / fiber-amplifier system (IMPULSE; Clark-MXR, Inc.) delivering 10 pj pulses at 1035 mn center wavelength, a spectral width of 11 mn and a compressed duration of nominally 250 fs.