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Q: Quantenoptik
Q 33: Laser II
Q 33.2: Talk
Friday, April 6, 2001, 16:00–16:15, H 104
50 W average power ultrafast Yb-doped fiber amplifier — •A. Liem1, J. Limpert1, T. Gabler1, H. Zellmer1, A. Tünnermann1, S. Unger2, S. Jetschke2, and H.-R. Müller2 — 1Friedrich-Schiller-Universität Jena, Institut für Angewandte Physik, Max-Wien-Platz 1, 07743 Jena, Germany — 2Institut für Physikalische Hochtechnologie e.V. Jena, Winzerlaer Str. 10, 07745 Jena, Germany
Today, one of the most challenging research topics in applied laser physics is the field of laser projection. Presently engaged systems use a passively mode-locked Nd:YVO oscillator delivering 10 ps pulses at a repetition rate as high as 80 MHz. These pulses are amplified to 40 W average power by a four stage single-pass bulk Nd:YVO amplifier system. Using nonlinear frequency conversion visible laser light in the power range of several watts is generated. In this contribution, we report on a cladding-pumped, ytterbium-doped large-core-area (55 µm core) fiber amplifier that is capable of generating 51.2 W average power at 1064 nm center wavelength, 80 MHz repetition rate and 10 ps pulse duration. In a ytterbium-doped large-mode-area (30 µm core) fiber the amplification of these pulses up to 43.2 W with diffraction limited beam quality (M2 = 1.3) could be realized. Power scaling limitations due to nonlinear distortions like self-phase modulation and stimulated Raman scattering will be discussed.