首页|5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber
5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber
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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 systematically investigated.As a result,an output of 4.80 kW and a beam quality factor of～1.33 were finally obtained,which is the highest output power ever reported in a fiber amplifier exploiting the low-NA fiber.The results reveal that low-NA fibers have superiority in power scaling and beam quality maintenance at high power levels.
high power fiber lasersytterbium-doped fiberlow-numerical-aperture fibermode instability
陈益沙、叶云、黄良金、杨欢、吴函烁、闫志平、潘志勇、王小林、王泽锋、周朴
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College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China
Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,China
Hunan Provincial Key Laboratory of High Energy Laser Technology,National University of Defense Technology,Changsha 410073,China
National Key R&D Program of ChinaState Key Laboratory of Pulsed Power Laser Technology
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