9 November 2016 Linear inner cladding fiber amplifier suppressing mode instability
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Abstract
We use a semi-analytical model considering pump power saturation in high power fiber laser systems of multi-kW-class to calculate mode instability threshold. A novel designed fiber, linear inner-cladding fiber, can mitigate mode instability effect by decreasing nonlinear coupling coefficient and smoothing heat profile along the fiber. We investigate strong pump absorption of linear inner-cladding fiber, leading to shorter fiber length. With 915 nm pumping, linear inner-cladding fiber can reach 10 kW output power without mode instability in theory.
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Zebiao Li, Zhihua Huang, Honghuan Lin, Shanhui Xu, Zhongmin Yang, Jianjun Wang, Feng Jing, "Linear inner cladding fiber amplifier suppressing mode instability", Proc. SPIE 10016, High-Power Lasers and Applications VIII, 100160T (9 November 2016); doi: 10.1117/12.2245848; https://doi.org/10.1117/12.2245848
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