Sequential reset method of phase shifter in beam phase control

Abstract

In the phase control of multiple beams, when multiple phase shifters reach the boundary at the same time, the traditional method is to reset multiple phase shifters at the same time. However, this approach leads to a significant drop in the combined beam optical power. To address this issue, we propose a new reset method. This method resets the phase shifters that reach the boundary at the same time in sequence. It helps to avoid the problems that cause large phase fluctuations and dramatic decreases in optical power. This paper presents the principle of coherent multibeam beam combining and compares the power fluctuations resulting from two different resetting methods. Theoretical derivations and numerical simulations are employed to analyze the effects. The results demonstrate that the sequential reset method yields smaller power jitter compared to the traditional reset method. Furthermore, the suppression of power jitter becomes more pronounced as the number of beams reaching the boundary simultaneously increases. To validate the feasibility of the sequential reset method, an experimental system is constructed. The experimental results reveal a remarkable 36.78% improvement in power stability when compared to the traditional reset method.