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, Zhihua Huang, Honghuan Lin, Shanhui Xu, Zhongmin Yang, Jianjun Wang, 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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