Study On High-order Reflective Ghost Imaging With Thermal Light

Correlation imaging, also called ghost imaging, is a hot topic in quantum optics research inrecent years. According to the different source light and imaging principle used in correlatedimaging, correlated imaging can be regarded as quantum phenomenon and classic opticalphenomenon. Compared with the entangled source, thermal source is more easily obtained. Hence,the correlated imaging with thermal source will have more application prospects. Compared withthe transmissive object in correlated imaging, the reflective object are more suitable for remotesensing. In this thesis, we study the high-order correlation imaging for the reflective object withthermal light.The main content of the thesis includes:(1). Most ghost imaging experiments and theories have addressed the transmissive object,however, reflective ghost imaging is more valuable in application, such as in the remote sensingtechnology. In this thesis, we study the high-order reflective ghost imaging with an incoherent,uniformly bright thermal light. We present the expressions of the cross-correlation function, imagevisibility, and signal-to-noise ratio for the high-order reflective ghost imaging. We discuss therelationship between the order numbers and the performance of high-order reflective ghost imaging.The simulation results show that the visibility of high-order reflective ghost imaging is enhancedfrom1.61%to19.28%while the signal-to-noise ratio is decreased from12.82dB to7.72dB with theorder is2~9and the measurement is5000. In additon, the signal-to-noise ratio is improved to12.05dB with the measurement increased to100000. Further, we analyse the high-order reflectioncorrelation imaging with a random incident angle, and present the expressions of thecross-correlation function through the mathematical calculation. The results show that the imagingresolution will decrease with incident angle enhanced.(2). For the light field is periodic in the perpendicular direction of transverse propagation,diffraction light field has a point to point correlation. Using the periodic diffraction effect incorrelation imaging, the periodic diffraction correlation imaging is a new correlation imagingscheme without beam-splitter. In this thesis, we present the theoretical analysis of the second-orderand high-order periodic diffraction correlation imaging for the reflective object. By the numericalsimulation, we discuss the performance of the new correlation imaging scheme. The numericalcalculations show that when the pinhole numbers of a pinhole array are determined, the visibility ofthe periodic diffraction correlation imaging is enhanced while the signal-to-noise ratio is decreasedwith the larger order. But when the order numbers are2, the visibility decrease0.05and signal-to-noise ratio is decreased from29.5dB to24.7dB with the pinhole numbers are20×20~60×60. So the pinhole numbers should be of little value as much as possible. Therefore,the periodic diffraction effect can be completely applied in the correlation imaging, and the periodicdiffraction correlation imaging scheme has the same properties with the traditional thermalcorrelation imaging with the light source size controlled.