Laser Scanning Feedback Imaging System Based on Digital Micromirror Device

Most of the traditional scanning feedback imaging systems cannot break through the limitations of scanning speed. In this letter, a fast scanning system with changeable scanning sequences by projecting patterns alternatively on the digital micromirror device is proposed. Combined with the laser feedback techniques, the system exhibits high sensitivity to weak signals from targets with low reflectivity. In experiments, the images of handwriting ink patterns on a piece of glass are obtained in 6 seconds, and the resolution of the system is evaluated to be $124.5~\mu \text{m}$ with a 3.24 mm by 3.24 mm field of view. This scanning feedback imaging system can be combined potentially with single pixel imaging techniques to reconstruct phase objects more efficiently.