5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber
Yisha Chen,
Yun Ye,
Liangjin Huang
et al.
Abstract:A low-numerical-aperture (NA) concept enables large-mode-area fiber with better single-mode operation ability, which is beneficial for transverse mode instability and nonlinear effects suppression. In this contribution, we reported a high-power fiber amplifier based on a piece of self-developed large-mode-area low-NA fiber with a core NA of 0.049 and a core/inner cladding diameter of 25/400 μm. The influence of the pump wavelength and fiber length on the power scaling potential of the fiber amplifier is system… Show more
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