Off-axis reflective active zoom system with broad spectrum and dynamic local high-resolution

To realize a broad spectrum and dynamic local high-resolution imaging, an off-axis reflective active zoom system is designed. This system combines off-axis reflective active zoom theory and local high-resolution theory together and realizes dynamic variable resolution in different focal lengths. Deformable mirrors (DMs) with variable curvature radii are used to change focal length to avoid complicated mechanical zoom movement control in a traditional system to reduce the volume and weight and to guarantee the broad spectrum of optical system. Through the control of deformable mirrors at different focal lengths, high-resolution within the Region of Interest (ROI) is achieved and the amount of data transmission is reduced. Moreover, as reflective systems have no chromatic aberration, it overcomes the disadvantages of monochrome imaging of traditional local high-resolution systems. After optimization, the imaging spectrum is visible light, the focal length ranges from 75 mm (Field of View(FOV) x: 0°-0.5°, y: 3°-10°)-150 mm (FOV x: 0°-0.5°, y: 1.7°-5°), the F/# is 7-14. The result of theoretical and simulation analysis indicates that the imaging quality of the ROI reaches the diffraction limit, and the system realizes dynamic local high-resolution in the FOV.