Mode competition in concentric-type multicore fiber lasers combined with large mode area single mode fiber

Xiaolei Zhang; Gangding Peng; Xingyu Zhang; Qingpu Wang; Jun Chang; Ping Li; Sasa Zhang

doi:10.1117/12.870245

16 November 2010 Mode competition in concentric-type multicore fiber lasers combined with large mode area single mode fiber

Xiaolei Zhang, Gangding Peng, Xingyu Zhang, Qingpu Wang, Jun Chang, Ping Li, Sasa Zhang

Author Affiliations +

Proceedings Volume 7843, High-Power Lasers and Applications V; 78431L (2010) https://doi.org/10.1117/12.870245
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

The mode competition mechanism in concentric 4-core and 7-core fiber lasers with large mode area single mode (SM) fiber as in-phase supermode selection component is presented. The coupling coefficient between the fundamental mode in large mode area SM fiber and each supermode in mutlicore fiber is discussed. For individual supermode in multicore fiber, the coupling coefficient is optimized as a function of the core radius of SM fiber as well as the distance between multicore fiber and SM fiber. The optimization results demonstrate that only two supermodes are involved in concentric-type fiber lasing - in-phase and anti-phase supermode, owing to the negligible coupling coefficients of the other supermodes. Furthermore, to achieve the best in-phase supermode selection, the core radius of SM fiber will be optimized for maximum coupling coefficient difference between in-phase supermode and anti-phase supermodes. The numerical results illustrate that in-phase supermode always dominate the output and is the highest when the distance equals zero. Compared to conventional multicore fiber lasers with Talbot cavity, this all-fiber configuration based on large mode area SM fiber has higher-order supermodes more efficiently suppressed and high-brightness output may be achieved.

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Xiaolei Zhang, Gangding Peng, Xingyu Zhang, Qingpu Wang, Jun Chang, Ping Li, and Sasa Zhang "Mode competition in concentric-type multicore fiber lasers combined with large mode area single mode fiber", Proc. SPIE 7843, High-Power Lasers and Applications V, 78431L (16 November 2010); https://doi.org/10.1117/12.870245

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KEYWORDS

Single mode fibers

Fiber lasers

Diffraction

Silicon

Cladding

Fiber couplers

Fiber optics sensors

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