Design of a semi-active laser/active radar/infrared common aperture compound optical system

A semi-active laser/active radar/infrared imaging tri-mode common aperture compound optical system is proposed, which adopts the compound structure of parabolic antenna and Cassegrain optical system. The three detection methods share a primary mirror ,which implement the separation of the infrared energy and laser energy and microwave energy in the secondary mirror; in order to reduce the blocking of microwave transmission by laser detection, using special design, the laser light spot is split into four parts, using of right-angle reflection optical waveguide, to placed in four separation unit quadrants which are located at the edge of the center of the optical axis at a distance 90° radar feeds are located in front of the optical waveguides which are connected with transmitters and receivers in the electronics bay by microwaveguides. This optical structure has high utilization of aperture and compact structure, and can effectively realize the combination of the three methods of detection and guidance modes.