Experimental research of tip/tilt control of a multi-channel fiber-laser array

The fiber-laser array technique has an extensive prospect of applications in the areas of coherent beam combination, free-space laser communications and so on. In this paper, considering the development trend of the fiber-laser array technique, the research progress of an adaptive fiber-optic collimator based on large-mode-area fiber is introduced, a 7-channel fiber-laser array is established, the tip/tilt control experiment of laser array under parallel-transmission configuration is conducted, and the tip/tilt control of laser array under conformal-transmission configuration using target-in-the-loop is explored. Finally, the tip/tilt control and phase locking of two 10-W level fiber lasers are achieved in the master-oscillator-power-amplifier (MOPA) system with three-stage all-fiber amplifiers. This paper presents a reference for using the fiber-laser array technique in real atmospheric environment.