4 March 2015 High power performance limits of fiber components
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High power combiners are essential for practical fiber lasers, recent developments in pump technology has increased the available brightness and power of pumps significantly, enabling multi kW lasers and pushing combiner designs to new limits. I will present the challenges, measurements and some solutions to these issues. Traditional calculations for combiners underestimate the issues associated with the ‘tails’ of the pump NA distribution, losses in fully filled combiners increase rapidly as pump NA blooms, and subsequent heating effects dominate the combiner’s power handling. Acrylate coated pump fibers are reaching their limits and devices and measurements on double clad pump combiners with losses <0.05dB, will be presented enabling multi kW operation, The use of triple clad fibers in the gain section will discussed as a solution for multi kW applications. Results on ultra-low background loss FBG’s will be presented, along with developed measurement techniques.
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Nigel Holehouse, Nigel Holehouse, Julien Magné, Julien Magné, Mathieu Auger, Mathieu Auger, "High power performance limits of fiber components", Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93441F (4 March 2015); doi: 10.1117/12.2086855; https://doi.org/10.1117/12.2086855

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