Experimental study on 1064 nm narrow linewidth DFB fiber laser

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Abstract
In this paper, an experimental ytterbium-doped distributed feedback fiber laser (Yb DFB-FL) was built. The main research focused on the effects of two pump configurations (forward and backward) and pump power on the performance of the laser, aiming to optimize the performance of the Yb DFB-FL. The experimental results show that compared with the forward pump configuration, the backward pump configuration has more complete absorption of the pump laser, higher output power and better unidirectionality. However, as the pump power increased, the output linewidth (LW) of the laser broadened significantly. To address this issue, we also designed an amplification configuration to minimize the broadening of the laser LW caused by the high pump power. Ultimately, an output laser power of 30 mW was achieved under a pump power of 150 mW, with a LW of 12 kHz.

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