Linear Verification of Model-based Wavefront Sensorless Adaptive Optics System

摘要

In recent years, the wavefront sensorless adaptive optics (AO) system receives extensive research and the model-based control AO system will become the most promising one. The model-based AO control system depends on a linear relationship between the second moments of the wavefront gradients and the masked far-field intensity distribution. Before investigating whether the model-based control algorithm has a good correction capability, the linear relationship must be verified. In order to testify the linear relationship, an AO system is established with a 37-eIement deformable mirror and a CCD camera. The CCD camera measures the information of far-field intensity distribution and the Shack Hartmann gets the wavefront information. The linear relationship is analyzed based on above the information. Result shows that there is a linear relationship between the second moments of the wavefront gradients and the masked far-field intensity distribution and the slop is 0.018, which is very close to the theoretical value 1 / (4π~2).