Research On The Feedback Ghost Imaging Based On Pseudo-thermal Light

Ghost imaging,also known as association imaging,is a kind of off-axis imaging method compared to traditional imaging system,and it has become a hot research topic in the field of quantum imaging in recent years because of its high resolution and anti-turbulence interference.Unlike the traditional imaging method of obtaining object information based on light field first-order association,ghost imaging is an imaging method to obtain object information based on light field second-order association and even higher order association.In order to obtain higher quality images,a large number of measurements are required,so low reconstruction efficiency and time-consuming data acquisition become the key problems restricting the practical development of ghost imaging.In view of the slow imaging speed of ghost imaging experiment,a feedback-based ghost imaging based on pseudo-thermal light system is proposed in this paper.The system includes a reverse amplifier and a voltage-controlled variable attenuator that placed in front of the camera on the reference arm,and the bucket detector signal is processed by the reverse amplifier as the external control voltage of the voltage-controlled variable attenuator,and the optical field is collected by the camera after the voltage-controlled variable attenuator.By extending the exposure time of the camera,the image of the object can eventually be achieved on the camera,and its imaging speed can be controlled to less than 1s.Finally,based on the characteristics of Schmidt orthographic ghost imaging algorithm in high complexity and susceptible to noise interference,an orthographic ghost imaging algorithm with adjustable depth is proposed.The final simulation results show that the scheme can significantly improve the image quality and reduce the complexity of the algorithm compared with the existing Schmidt orthographic ghost imaging algorithm under the condition of noise.