The Experimental Study Of Wavefront Reconstruction With Green's Function In Curvature Sensor

Wave-Front sensor (WFS) is one of the most important constitutions of adaptive optics (AO) system, and traditional WFS can't offer high sensitivity, wide dynamic range and flexible spatial resolution characteristic. Wave-Front Curvature-sensor (WFCS) can satisfy all these requirements. But the implementation of traditional WFCS in the optical system is difficult, so the applications is limited. The Wave-Front Curvature-sensor with a diffraction grating(DGWFS) has the unique ability to sample the wave front at two planes and form two images side-by-side on a CCD camera. Applications of DGWFS include such diverse fields as optical astronomy ,ophthalmometry, laser beam profiling, optical component testing, and microscopy. In our country, Shen Hong-bin has given some simulations about DGWFS, In this paper, we validated the performance of DGWFS by the study of experimentation.The developments of WFS and the algorithms for wavefront reconstruction is introduced firstly. Secondly, the theory about WFS and DGWFS is discussed as well as the design of DGWFS and so on. Thirdly, a new method for reconstructing an unknown wave front is described, which solves the intensity transport equation by use of Neumann boundary conditions, leading to a solution that requires only matrix multiplication. Finally,I validated the performance of DGWFE by the experimental study. In this part I mainly dicussed the calculation of Green's retrieval matrix, the method about how to fix on the reference of the system, wavefront reconstruction,analysis about error analysis and so on. In the part of error analysis we mainly discussed the impact of the reference facula'difference, the external and system noise, the entrance of inhomogenemous light and so on. The performance of DGWFS and the new algorithm is validated by the study of experimentation. We can get the conclusion that the system is robust to many sources of experimental error and the algorithm is fast to reconstruct wave front. Some conclusions about the reference of the system and the introduce about Green-matrix will give some guidance to improve DGWFS.