Experiment of Suppressing Atmospheric Turbulence by Using Fast-Steering Mirror

With the aim of addressing the problem of spot drift caused by laser transmission in atmospheric turbulence, the effects of different weather conditions such as sunny, cloudy, rainy and sandstorm conditions on spot drift were measured at 0.42 km, 2 km and 10 km transmission distances, and the correction performance of a fast-steering mirror (FSM) was evaluated. The results show that under weak-turbulence conditions such as sunny, cloudy and short-distance conditions, the mean and variance of spot drift are relatively small, and the disturbance is dominated by low frequency. The FSM achieves more effective correction, significantly reduces the drift amplitude and improves the system stability. Under strong-turbulence conditions such as rainy days, dust storms and long distances, the mean and variance of drift increase significantly, and the spot disturbance frequency is higher. The response ability of the FSM to high-frequency disturbance is limited, and the correction effect decreases. In general, the FSM is more suitable for low-intensity disturbance scenarios, and its correction performance has certain limitations under strong-disturbance and long-distance conditions.