| Autor: |
Köhler, Bernd, Ahlert, Sandra, Bayer, Andreas, Kissel, Heiko, Müntz, Holger, Noeske, Axel, Rotter, Karsten, Segref, Armin, Stoiber, Michael, Unger, Andreas, Wolf, Paul, Biesenbach, Jens |
| Zdroj: |
Proceedings of SPIE; February 2012, Vol. 8241 Issue: 1 p824108-824108-9 |
| Abstrakt: |
The demand for high-power and high-brightness fiber coupled diode laser devices is mainly driven by applications for solid-state laser pumping and materials processing. The ongoing power scaling of fiber lasers requires scalable fibercoupled diode laser devices with increased power and brightness. For applications in materials processing multi-kW output power with beam quality of about 30 mm x mrad is needed. We have developed a modular diode laser concept combining high power, high brightness, wavelength stabilization and optionally low weight, which becomes more and more important for a multitude of applications. In particular the defense technology requires robust but lightweight high-power diode laser sources in combination with high brightness. Heart of the concept is a specially tailored diode laser bar, whose epitaxial and lateral structure is designed such that only standard fast- and slow-axis collimator lenses in combination with appropriate focusing optics are required to couple the beam into a fiber with a core diameter of 200 m and a numerical aperture (NA) of 0.22. The spectral quality, which is an important issue especially for fiber laser pump sources, is ensured by means of Volume Holographic Gratings (VHG) for wavelength stabilization. In this paper we present a detailed characterization of different diode laser sources based on the scalable modular concept. The optical output power is scaled from 180 W coupled into a 100 m NA 0.22 fiber up to 1.7 kW coupled into a 400 m NA 0.22 fiber. In addition we present a lightweight laser unit with an output power of more than 300 W for a 200 m NA 0.22 fiber with a weight vs. power ratio of only 0.9 kg/kW. |
| Databáze: |
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