Research on spatial filter lens auxiliary adjustment system in high power laser facility

Abstract

The spatial filter is the key component of the amplifier system in ICF high power laser driver. The conjugate lens at both ends and the filter hole in the middle constitute the main optical axis of the amplifier. Filter lens usually needs precise adjustment, and the existing adjustment mechanism is integrated at both ends of the filter, which is inconvenient to adjust and occupies a large space in use. Therefore, a parallel lens adjustment mechanism was designed as an auxiliary tool to realize the X, Y, Z axis translation, Pitch and Yaw adjustment function of the filter lens. The single-side first-order ghost point of the filter lens was used as the reference for adjustment feedback to conduct axial positioning. The combination of open-loop nonlinear iterative learning ILC and closed-loop linear PID control optimized the iterative path of the postures, which can effectively predict external interference and compensate in advance. The experimental results verified the effectiveness of the adjustment mechanism and the posture feedback method.