Abstract
We report here a method to fabricate the (6 + 1) × 1 bi-directional pump/signal combiner with high pump coupling efficiency and negligible degradation for the M2 value of signal light. The pump coupling efficiency for all the six pump fibers is more than 98 %. A CCD camera is firstly used in the alignment fusion process of the fiber bundle and the output fiber, which is precise and convenient. The degradation ratio of the M2 value of the signal light is 2.2 % after fusion process, which is, to the best of our knowledge, the minimum reported value for the same type of combiner. In addition, the home-made combiner is applied in a counter-directional pumping amplifier, whose maximum output power is 4 kW with the slope efficiency of 81.3 %. The temperature rise coefficient of the home-made combiner is 12.1 °C/kW, indicating the great potential of the combiner in high-power laser applications.
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