High accuracy optical axis stable control in beam system of four lasers

The fast steering mirror manufactured by adopting piezoelectric ceramics and corresponding control and feedback systems were introduced in this paper. The performance of each fast steering mirror was tested, including the key parameters of response speed, dynamical range and closed loop resolution. Then the experiment with optical control in coherent beam combining system was done when the power of light extraction of four lasers reached 100 W. The results show that the optical axis jitters of four lasers are all less than 1.5 rad (RMS) with closed-loop stability control, which decreases by 80% compared to open-loop results, and the average peak-valley value in far-field increases by 3.8 times.