Control method of coherent beam combining angle scanning based on linear fiber array

Laser beam combining technique allows increasing the power of laser radiance far beyond what is obtained from a single conventional laser. Moreover, this technique is also able to control the far-field laser combining intensity distribution. Based on the theory, the principle of coherent combining of lasers from multi-core linear fiber array was studied. By using the coherent synthesis model, the coherent combining effect of multi-core linear fiber array was numerically simulated by MATLAB when wavefront of the lasers with and without random phase noise respectively, and the feasibility of angle scanning using actively phase-controlling was analyzed. The coherent combining angle scanning control system was built based on MOPA laser linear array fibers. The experiment shows that active phase-controlling of the laser linear array is able to realize the angle scanning of the main maximal stripe, and the scanning range is between two secondary large stripes. The experimental results are consistent with the theoretical calculation, and that has a guiding significance to the application of coherent combining of linear fiber array lasers.