Spatial frequency analysis of wavefront compensation capabilities of deformable mirror

Based on the principle of spatial filter, the wavefront compensation capabilities of the continuous surface deformable mirror with discrete actuators were analyzed. As a high-pass spatial filter, the relationships between the filter function and the deformable mirror’s parameters, such as actuator density, Gaussian index and coupling, were discussed. The simulation result shows that the actuator density is the decisive factor of wavefront compensation and increasing the Gaussian index or the coupling may profit correcting low order aberrations. This indicates that the choice of deformable mirror’s parameters should depend on the incident wavefront in practice.