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Q: Fachverband Quantenoptik und Photonik

Q 28: Laser Development I

Q 28.5: Vortrag

Mittwoch, 2. März 2016, 12:00–12:15, a310

Thin-film filter wavelength-stabilized, grating combined high-brightness direct diode laser — •Matthias Haas, Simon Nagel, Simon Rauch, Markus Ginter, Rolf Beisswanger, Alexander Killi, and Hagen Zimer — TRUMPF Laser GmbH, Schramberg, Germany

Direct diode lasers are of great interest in many fields of today’s industrial laser material processing. During the past decade low-brightness multi-kW direct diode lasers have successfully replaced flash lamp pumped rod lasers in laser metal processing applications such as surface treatment, brazing and welding. The striking advantage of such lasers compared to optically pumped solid state lasers consists of higher compactness and enhanced electrical-to-optical conversion efficiency of up to 50%. Quite recently high-brightness external cavity dense wavelength beam combined diode lasers have come of age which are able to serve all kinds of high-brilliance laser applications as for instance flat-sheet metal cutting or remote welding. In our talk we report on dense wavelength beam combining (DWBC) of ten horizontally stacked broad-area laser diode bars by using a novel multi-laser cavity approach based on a thin-film filter (TFF) as a dispersive optical element. The wavelength-stabilized output of the TFF cavity is beam combined upon a transmission grating in Littrow configuration. Hereby a cylindrical telescope is used for dispersion matching between the TFF and the combiner grating. We demonstrate a direct diode laser with an output power of 500 W from a 100-µm, 0.1-NA fiber and discuss limitations of beam quality preservation using this DWBC architecture.