Image cloning beyond diffraction based on coherent population trapping in a hot Rubidium vapor

Following the recent theoretical predictions given in a paper [PRA 88, 013810 (2013)], we reported on an experimental realization of an image cloning beyond usual diffraction through coherent population trapping (CPT) effect in a hot rubidium vapor. In our experiment, an alphabet image was transferred from a coupling field to a probe field based on the CPT effect. Furthermore, we demonstrated that the cloned probe field carrying the image transmitted without usual diffraction. To our best knowledge, there is no any such an experimental report about images cloning beyond diffraction. We believe this mechanism based on CPT definitely has important applications in image metrology, image processing and biological imaging.