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When the field of operation of precision strike missiles is more and more complicated,autonomous seekers will soon encounter serious difficulties,especially with regard to low signature targets and complex scenarios.So the dual-mode sensors combining an imaging sensor with a semi-active laser seeker are conceived to overcome these specific problems.Here the sensors composed a dual field of view mid-infrared thermal imaging camera and a laser range finder have the common optical aperture which produced the minization of seeker construction.The common aperture optical systems for mid-infrared and laser dual-mode guildance have been developed,which could meet the passive middle infrared high-resolution imaging and the active laser high-precision indication and ranging.