Research On Laser Imaging And Transmission Technology In Complex Environment

Laser technology is widely used in laser radar,laser ranging and laser remote sensing imaging and underwater optical imaging and other fields now.When the laser transmitted in the atmosphere or underwater or other complex environment,it subject to the media inevitably.Especially in the Atmospheric transmission,as the atmospheric absorption,scattering and turbulence and other effects will make the optical signal attenuation,light intensity fluctuation and phase fluctuation,and these problems limit laser to the further application.Therefore,it is of great significance to study the transmission and imaging of laser in complex environment.The work of this paper is about this problem,and the following work is mainly done:1.Completed the real-time repair of distorted images,and solve the problem of low resolution imaging in complex environment.Do some theoretical study on the method of eliminating image distortion,and then complete the experimental design,build three-wave mixed optical phase conjugate system to eliminate the image distortion.The resolution of restored image is 12 lines/mm and over 17 dB image amplification is obtained in this experiment.In this paper,three-wave mixing is used to obtain phase conjugate light.The method has the advantages of simple optical path,high conversion efficiency,fast response speed and low pump power demand,which has certain guiding significance for eliminating the distortion in reality.2.Propose a solution to solve the problem that underwater image transmission can't balance resolution and transmission distance.We combine correlation detection and acoustic communication(application number:201611183949.5),then put forward to a remote transmission device for underwater correlation image.Optical imaging ensures high-resolution and acoustic transmission ensures long-distance and correlation detection ensures encryption.The program not only retains the advantages of optical imaging high resolution,but also solves the problem that the optical signal propagation distance is short underwater.3.Based on the Kolmogorov theory,the transmission characteristics of the laser in the turbulent atmosphere are studied by the phase screen method,and the intensity fluctuation and phase fluctuation under different conditions are calculated and the feasibility of phase conjugation technique for atmospheric distortion are analyzed.It is expected to use it in the complex environment such as underwater,atmosphere and biological organization to eliminate the distortion caused by the medium and realize the high complexity in the complex environment by using the three-wave mixing optical phase conjugation technology since its fast response speed and simple optical path and real-time repair.