Abstract
We demonstrate the coherent polarization beam combining (CPBC) of four polarization-maintained fiber amplifiers in 100ns-pulse regime using single frequency dithering technique for the first time. Experimental results reveal that phase noise of each amplifier chain can be effectively suppressed. The combining efficiency of the CPBC system is 92% and the residual phase error is less than λ/20. The intensity profile of the coherently polarization combined beam is steady for long time observation without degradation of the beam quality.
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