Research on beam steering of numerous sub-aperture fiber laser phased array

Numerous sub-aperture fiber laser array is one of the emerging technologies to build high power, high beam quality and equivalent optical large aperture. Realizing the common phase and even the fast and flexible beam deflection of array laser beam based on the precise phase control is the key to the application of the current fiber laser phased array technology. In this paper, the optical phase-controlled steering technology is combined with the fiber laser coherent combining system, and the beam steering characteristics of the numerous sub-aperture fiber array laser coherent combining systems are studied. The beam steering is realized by changing the phase difference between the adjacent sub-aperture of the collimated laser array. The far-field steering beam pattern distribution characteristics of 19, 133 and 703 aperture fiber laser phased arrays are compared and analyzed, and the steering limit range is defined and calculated accordingly. The results provide a theoretical basis for the subsequent experimental research on the precise pointing control of fiber laser phased arrays under long-range transmission.