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Q: Quantenoptik
Q 33: Laser II
Q 33.3: Talk
Friday, April 6, 2001, 16:15–16:30, H 104
Ultrafast Fiber CPA System — •J. Limpert1, A. Liem1, H. Zellmer1, A. Tünnermann1, D. Nickel2, U. Griebner2, and G. Korn2 — 1Friedrich-Schiller-Universität Jena, Institut für Angewandte Physik, Max-Wien-Platz 1, 07743 Jena, Germany — 2Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2a, D-12489 Berlin, Germany
Applying the CPA technique in fiber amplifiers is very attractive for constructing compact and practical high-energy pulse sources with high repetition rates. Sufficient pulse stretching in the time domain enables to reduce nonlinear pulse distortions in the core and to extract energies in the order of the saturation fluence limit of rare-earth doped fibers. Short pulses are then generated by the incorporation of a compression stage. In this contribution, we report on a high-gain diode pumped ytterbium-doped fiber amplifier system delivering pulse energies in the 100 µJ range at high repetition rates (32 kHz) with nearly diffraction limited beam quality (M2 = 1.7) at a 1060 nm center wavelength. Femtosecond seed laser pulses are stretched in a commercially available singlemode fiber and compressed after amplification to subpicosecond pulse duration. Power scaling up to several mJ pulse energy, beam quality and limitations due to nonlinear effects using large-core-area and large-mode-area fibers will be discussed.