Linear inner cladding fiber amplifier suppressing mode instability

Zebiao Li; Zhihua Huang; Honghuan Lin; Shanhui Xu; Zhongmin Yang; Jianjun Wang; Feng Jing

doi:10.1117/12.2245848

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9 November 2016 Linear inner cladding fiber amplifier suppressing mode instability

Zebiao Li, Zhihua Huang, Honghuan Lin, Shanhui Xu, Zhongmin Yang, Jianjun Wang, Feng Jing

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Proceedings Volume 10016, High-Power Lasers and Applications VIII; 100160T (2016) https://doi.org/10.1117/12.2245848
Event: SPIE/COS Photonics Asia, 2016, Beijing, China

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, and Feng Jing "Linear inner cladding fiber amplifier suppressing mode instability", Proc. SPIE 10016, High-Power Lasers and Applications VIII, 100160T (9 November 2016); https://doi.org/10.1117/12.2245848

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