Off-axis optical telescope for satellite laser communication terminal

The coaxial two-mirror reflective telescope was usually used within a typical satellite laser communication terminal, which has the disadvantage of small field of view and low emission efficiency. In order to eliminate the inherent defects of the existing coaxial two-mirror reflective telescope, and improve the pointing and tracking efficiency of the satellite laser communication system, off-axis three-reflective optical telescope was designed for satellite laser communication terminal. The initial structure of the off-axis telescope was deduced according to the basic aberration theory, and the off-axis three-mirror reflective telescope with more lager field of view and higher efficiency was given. Simulation results of modulate transfer function, spot diagram, diffraction encircled energy and wavefront error all show that the off-axis three mirror reflective structure has the better performance compared with the coaxial two-mirror reflective structure, and meets the increasing design requirements of satellite laser communication system.