Coherent polarization beam combining of eight fiber lasers using single-frequency dithering technique

In this manuscript, coherent polarization beam combining (CPBC) of eight fiber lasers is demonstrated for the first time. The compact and robust single frequency dithering technique is employed to active phase-locking the eight laser beams. When the system is in the closed loop, the phase noise can be suppressed effectively for long-time observation. The experimental results show that the combining efficiency of the whole system is as high as 92%