An Experimental Study On The Diffraction Imaging Of An Object-light Wavefront

Information optics is based on holographic image technology and laser technology.It uses optical equations as a medium to display many advantages in image information processing.It has gradually become an important direction for optical research.With the advancement of wavefront detection technology,various types of holographic recording methods to get rid of the interference method have realized commercial products.This makes it possible to implement technologies such as lensless imaging and single acquisition tomography.In order to apply the wavefront sensor in the above-mentioned fields,this paper discusses the basic theory,algorithm,and experiment of computational holography imaging.The article first describes the development background of traditional holographic and computational holography,and in-depth discussion of the basic theory of computational holography-scalar diffraction theory expression under different conditions,such as Kirchhoff diffraction formula,Rayleigh-Sommerfeld diffraction formula,Fresnel diffraction formula and Fraunhofer diffraction formula.Based on this,the article analyzes and discusses three different Fresnel diffraction algorithms.Theoretical explanations and simulation experiments were performed for each method.The applicable conditions and advantages and disadvantages of the three methods were carefully compared,laying the foundation for the optimization of computational holographic imaging.By contrast,this paper uses Fresnel diffraction single-fast Fourier transform algorithm.In order to realize the quantitative calculation of the wavefront acquisition data to achieve diffraction tracking imaging,the traditional algorithm theory is optimized in this paper.It uses the segmented diffraction calculation method to solve the problem that the algorithm can not adjust the diffraction distance and undersampling severely affect the calculation result.This optimization method also has good reference value for other similar problems.Through the optimization of the algorithm,the article uses wavefront sensor experiments to collect the actual data,and uses the diffraction tracking theory and the improved Fresnel diffraction single Fourier transform method to optimize the computational holographic imaging.And good results were obtained,which laid the foundation for the future tomographic imaging.