| 摘 要： | The coupling efficiency of the pump coupler determines the pump light injection capacity of a laser system.Experimental analysis of the influences of different factors on the pump coupling efficiency is in accordance with this conclusion.We use two Nufern fibers(400 μm/440 μm with NA = 0.22) as pump arm,one Nufern fiber(20 μm/400 μm with NA =0.06/0.46) as a main fiber to make a side-pumping(2 + 1) × 1 coupler.The experimental result shows that the total output power of this(2 + 1) × 1 coupler is about 1160 W,corresponding to a coupling efficiency as high as 98.6%.The loss of signal light is less than 1%.
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