Non-local Angle-modulated Fifiltering Imaging Of Thermal Light

Correlated imaging,also known as ghost imaging or quantum imaging,divides the optical path into two beams,a test beam and a reference beam.The image of the object is attained by second-order correlation measurement between two spatially correlated light beams,including the object detector to be two tested without spatial resolution called the test beam and the other detector has spatial resolution and scanning measurement is called the reference beam.Finally,ghost imaging reconstructs the target image by correlating the intensity correlation measurement between the test beam and the reference beam.In recent years,ghost imaging has a broad application prospect in laser communication,infrared imaging,information transmission,spectral analysis,remote sensing detection,target recognition and other fields because of its high resolution,non-localized,anti-interference characteristics,different from the traditional optical imaging.Based on the ghost imaging system of thermal light,we combined the classic Abbe-Porter filtering and the ? modulation filtering for the non-local anglemodulated spatial fifiltering imaging of thermal light through theoretical analysis,simulation calculation and experiments.Based on the lensless ghost diffraction system of thermal light,we combined the Franhofer diffraction and the Babinet's principle to put forward the Babinet's principle of thermal light through the theory analysis and the simulation experiment of the amplitude complementary objects.The main research contents are as follows,including the following three aspects:Firstly,the experiment and simulation of Abbe-Poter filtering of thermal light are completed on the ghost imaging system of thermal light.The two-dimensional periodic grid amplitude object and horizontal or vertical filters are placed in the symmetric optical path,and the horizontal or vertical directions of the directional filters located on the back focal plane of the biconvex lens of the reference optical path are regulated to achieve filtering,and finally correlation measurements are performed.The spatial limitations of the classical Abbe-Poter filtering system are broken through and the nonlocal characteristics are realized.Secondly,the non-local angle-modulated fifiltering imaging of thermal light was proposed and accomplished by integrating the ghost imaging system of thermal light and the ? modulation filtering imaging scenarios.Superior to the ? modulation filtering imaging experiment,the detected target object "car" and the directional filter are placed in two symmetrical optical paths,a test beam and a reference beam.The object was placed close to the detection plane of the bucket measurement detector in the test beam and the directional filter was placed in the back focal plane of the biconvex imaging lens in the reference beam.According to the spectral distribution,the position of the directional filter on the rear focal plane of the biconvex lens is adjusted appropriately to achieve the modulation filtering of different parts of the "car".On the basis of theoretical analysis,the simulation experiments were carried out and the experimental results were accord with the simulation.The innovative non-local angle-modulated spatial fifiltering imaging of thermal light scenario releases the limitation of the coherent light source and local position of the spatial fifilter.On the basis of the non-local anglemodulated fifiltering imaging of thermal light experiment,the non-local "creation of something from nothing" filtering experiment is proposed and demonstrated through the simulation,which can effectively realize the local identification of completely transparent objects and has potential applications in the fields of spectral analysis,object identification and confidential information transmission.Thirdly,based on the lensless ghost diffraction system of thermal light,we combined the Franhofer diffraction and the Babinet's principle to put forward the Babinet's principle of thermal light through the theory analysis and the simulation experiment of the amplitude complementary objects.The Babinet's principle based on the Fraunhoffer diffraction refers to that two complementary transmittance plates produce the same diffracted light intensity distribution and have the same diffraction patterns.In the experimental system of the lensless ghost diffraction system of thermal light,the thermal light is divided into a detection path and a reference path after passing through the beam splitter,and finally the correlation measurement is performed to obtain the ghost diffraction pattern of the object.Two complementary light-transmitting screens have the same ghost diffraction patterns under the two-way non-deterministic condition,and the Babinet's principle of thermal light is proved by obtaining the same ghost diffraction pattern of the object with complementary amplitudes.