Research on temporal stability of 1050nm narrow linewidth fiber oscillator

In a narrow-linewidth fiber laser, temporal stability of the seed is of great significance for suppressing nonlinear effects during the power amplification. Based on a 1050nm narrow linewidth fiber oscillator, spectral and temporal characteristics have been quantitatively analyzed with four different topological structures. Experimental results reveal that adding a ~20m passive fiber between the high reflection grating and gain fiber can significantly improve the temporal stability of the oscillator. At the same power level, the normalized standard deviation has been reduced by ~46.8% and the 3dB spectral linewidth is only broadened by 0.016nm. Further verification of the optimization measures will be conducted in a high-power amplifier in the future.