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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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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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