Experimental study on coherent combining of two self-organized fiber lasers
Coherent combining of two self-organized fiber lasers is investigated theoretically and experimentally.It is shown that fiber lasers can be coherently combined using self-coherence by mutual injection,and the experimental combining efficiency can reach 92%.Interference fringes with high contrast ratio showing out-of-phase mode were obtained when there was little environmental interference.The experimental result is consistent with the conclusion deduced by the theoretical model.The motion of interference fringes caused by the environmental interference were also observed.The evolution of phase difference between two laser beams was calculated numerically in the case that the phase noise induced by environmental interference exists.The results show that the phase difference will change more notable and rapidly as amplitude and frequency of the phase noise get larger.The two laser beams will not be phase-locked when amplitude and frequency of the phase noise are beyond certain values.