9 November 2017 Mitigate transverse mode instability by linear inner-cladding fiber
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Abstract
Transverse mode instability (TMI) limits power scaling of fiber lasers. A semianalytical model is established to calculate the TMI threshold in high-power fiber laser systems of the multi-kW-class. A linear inner-cladding fiber can mitigate the TMI effect by smoothing the heat profile and decreasing the nonlinear coupling coefficient along the fiber. We investigate strong pump absorption of a linear inner-cladding fiber, which leads to shorter fiber length. Utilizing a 915-nm copumping scheme, the linear inner-cladding fiber can realize 10-kW output power in single-mode regime theoretically.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Zebiao Li, Zebiao Li, Zhihua Huang, Zhihua Huang, Honghuan Lin, Honghuan Lin, Shanhui Xu, Shanhui Xu, Zhongmin Yang, Zhongmin Yang, Jianjun Wang, Jianjun Wang, Feng Jing, Feng Jing, } "Mitigate transverse mode instability by linear inner-cladding fiber," Optical Engineering 56(11), 116105 (9 November 2017). https://doi.org/10.1117/1.OE.56.11.116105 . Submission: Received: 8 May 2017; Accepted: 16 October 2017
Received: 8 May 2017; Accepted: 16 October 2017; Published: 9 November 2017
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