Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 22: Laser development: Solid state lasers I
Q 22.1: Vortrag
Dienstag, 19. März 2013, 11:00–11:15, F 142
High power 2.4 mJ Thulium-doped large-pitch fiber oscillator — •Fabian Stutzki1, Florian Jansen1, Cesar Jauregui1, Jens Limpert1,2, and Andreas Tünnermann1,2,3 — 1Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany — 2Helmholtz-Institute Jena, Fröbelstieg 3, 07743 Jena, Germany — 3Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein-Str. 7, 07745 Jena, Germany
Fiber lasers offer high average powers, near diffraction-limited beam qualities, high efficiencies and simple configurations. Therefore, they are the ideal tool for many laser applications. Nowadays, several biological, medical, spectroscopic and military applications demand for wavelengths in the near-infrared region, which are not directly accessible with well-established Ytterbium-based fiber technology. Therefore, the research interest has shifted to new dopands like Thulium, which allow for laser radiation around 2 mu. In this contribution, we report on a high pulse energy and high average power Q-switched Tm-doped fiber oscillator. The oscillator produces 2.4 mJ pulses with 33 W average power and nearly diffraction-limited beam quality. The pulse duration of 15 ns results in a pulse peak power of more than 150 kW, which is a new record for Tm-based fiber oscillators. This performance is enabled by a Tm-doped large-pitch fiber, which allows for large core diameters in combination with effective single-mode operation. We will discuss further scaling capabilities and limitations of Tm-based ultrafast fiber lasers.