11 March 2016 Novel beam delivery fibers for delivering flat-top beams with controlled BPP for high power CW and pulsed laser applications
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Abstract
Single-mode (SM) kW-class fiber lasers are the tools of choice for material processing applications such as sheet metal cutting and welding. However, application requirements include a flat-top intensity profile and specific beam parameter product (BPP). Here, Nufern introduces a novel specialty fiber technology capable of converting a SM laser beam into a flat-top beam suited for these applications. The performances are demonstrated using a specialty fiber with 100 μm pure silica core, 0.22 NA surrounded by a 120 μm fluorine-doped layer and a 360 μm pure silica cladding, which was designed to match the conventional beam delivery fibers. A SM fiber laser operating at a wavelength of 1.07 μm and terminated with a large-mode area (LMA) fiber with 20 μm core and 0.06 NA was directly coupled in the core of the flat-top specialty fiber using conventional splicing technique. The output beam profile and BPP were characterized first with a low-power source and confirmed using a 2 kW laser and we report a beam transformation from a SM beam into a flat-top intensity profile beam with a 3.8 mm*mrad BPP. This is, to the best of our knowledge, the first successful beam transformation from SM to MM flat-top with controlled BPP in a single fiber integrated in a multi-kW all-fiber system architecture.
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C. Jollivet, C. Jollivet, K. Farley, K. Farley, M. Conroy, M. Conroy, J. Abramczyk, J. Abramczyk, S. Belke, S. Belke, F. Becker, F. Becker, K. Tankala, K. Tankala, "Novel beam delivery fibers for delivering flat-top beams with controlled BPP for high power CW and pulsed laser applications", Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97283D (11 March 2016); doi: 10.1117/12.2212705; https://doi.org/10.1117/12.2212705
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