Research On The Focusing Technology Of Random Medium And Its Application In The Field Of Superresolution

Along with the development of biotechnology,materials science,medical imaging,the rapid development of a number of areas of object detection,the traditional optical field resolution level is more and more difficult to meet people’s needs,seriously restrict the development of these applications in higher resolution or smaller focal spot size on the direction,the main reason is that due to the diffraction limit imaging system resolution is limited.How to break through the diffraction limit and realize optical superresolution has become the goal of the research workers in this field.Based on the optical principle,we have analyzed the method of realizing the super diffraction limit focusing,and further studied the super diffraction limit focusing based on the random medium.First,based on the existing research at home and abroad,we introduce the methods and applications of super-resolution technology,and then analyze the improvement and the reason of the super resolution technology introduced by random medium for imaging quality.And then through the optical domain knowledge system to describe the random medium,and analyzed the optical transmission model in the medium,introduces its spatial and spatial frequency of Green function,and based on the incident light and the output of the optical channel is discretized on the optical transmission matrix model is established.Secondly,further study beyond the diffraction limit focusing technique based on random medium,the performance of the principle and method of simulation analysis is carried out,and the optical experiments prove the validity of the method,but also compared the focus transfermatrix method and the pros and cons of feedback control method based on focusing.Based on the above research,this paper proposes a random scattering media focusing method of phase-shifting digital holographic interferometry based on phase shift algorithm to extract the phase information,combined with the construction of wavefront phase conjugate compensation principle to achieve beyond the diffraction limit of focus,significantly reduced the complexity of the experimental operation,reduce the cost of manpower and time in the course of the experiment.At the same time,the simulation and experiment of the method are carried out,and the experimental results of several different phase shift algorithms are compared and analyzed.Finally,the optical focusing effect of the scattering medium and the non scattering medium is compared,and the feasibility of this method is proved to be applied to the super-resolution technology.In addition,this paper also analyzes the error in the experimental results,analyzes its source and gives some suggestions.