50µm-core Yb-doped leakage channel fiber with flattened mode

Fanting Kong; Guancheng Gu; Thomas W. Hawkins; Joshua Parsons; Maxwell Jones; Christopher Dunn; Monica T. Kalichevsky-Dong; Kanxian Wei; Bryce Samson; Liang Dong

doi:10.1117/12.2052601

9 June 2014 50μm-core Yb-doped leakage channel fiber with flattened mode

Fanting Kong, Guancheng Gu, Thomas W. Hawkins, Joshua Parsons, Maxwell Jones, Christopher Dunn, Monica T. Kalichevsky-Dong, Kanxian Wei, Bryce Samson, Liang Dong

Author Affiliations +

Proceedings Volume 9081, Laser Technology for Defense and Security X; 90810F (2014) https://doi.org/10.1117/12.2052601
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

Abstract

Power scaling of fiber lasers is highly desirable in many applications but is mainly limited by nonlinear effects. Large-mode-area fibers have been used to mitigate this limit, such as the leakage channel fiber (LCF). The mode intensity profile in these fibers typically exhibits Gaussian-like structure with much reduced effective mode-area compared to the physical fiber core area. Thus, a flat-top mode with a uniform intensity distribution is more suitable for larger effective mode-area without having to increase core size. In this work, we demonstrate the first flat-top mode generated in a 50 μm-core Yb-doped LCF fiber. The mode flattening from Gaussian beam to a flat-top one is achieved by using a 30 μm uniform Yb-doped area in the core center with a refractive index very slightly below that of the background silica glass by 2×10^-4. The resulting flat-top mode has a significantly increased effective mode area of ~1880 um², which is ~50% larger than that of a conventional uniform core and ~6 times the effective mode area of the flat-top mode record demonstrated previously. A 6m-long fiber is also tested in a laser configuration with a slope efficiency of ~84% at 1026 nm with respect to the absorbed pump power at 976 nm.

Citation Download Citation

Fanting Kong, Guancheng Gu, Thomas W. Hawkins, Joshua Parsons, Maxwell Jones, Christopher Dunn, Monica T. Kalichevsky-Dong, Kanxian Wei, Bryce Samson, and Liang Dong "50μm-core Yb-doped leakage channel fiber with flattened mode", Proc. SPIE 9081, Laser Technology for Defense and Security X, 90810F (9 June 2014); https://doi.org/10.1117/12.2052601

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