Research On Ghost Imaging Robustness In Random Media

Ghost imaging has shown great advantages in many aspects compared with the traditional imaging method.It has a wide application prospect in the fields of free space optical communication,optical encryption,edge detection,radar remote sensing and so on,and attract great attention.Based on these advantages and potential application prospects,combined with mature theoretical methods,this thesis studies the ghost imaging of partially coherent vortex beams,X-ray,scalar and vector partially coherent Bessel Gaussian beams in complex environments both theoretically and experimentally.Firstly,ghost imaging of partially coherent vortex beams in atmospheric turbulence is studied theoretically and experimentally based on the lensless ghost imaging model.The effects of different topological charges,turbulence strength and coherence width on imaging quality are analyzed.The theoretical and experimental results shown that the vortex phase can significantly reduce the influence of turbulence,improve the quality of ghost imaging,and with the increase of topological charges,the image quality will be improved.Secondly,the X-ray ghost imaging in objects with spatial periodic structure is studied,and the conventional diffraction pattern and ghost imaging diffraction pattern are compared at different coherent widths.The results shown that different from the traditional diffraction method,the diffraction pattern quality of ghost imaging will gradually improve with the decrease of the coherence width,which indicates that ghost diffraction method has great advantages in crystallography under the condition of extreme low coherent radiation sources.Finally,the ghost imaging of scalar and vector partially coherent Bessel Gaussian beams passing through obstacle is studied based on the self-healing properties of partially coherent beams,and the ghost imaging under different obstacle sizes and transmission distances are analyzed.The results shown that the ghost image pattern will recover gradually with the increase of the transmission distance after passing through the obstacle,and the recovery effect of vector beam is better than that of scalar beam.