Research And Preparation Of The Visible-Infrared Control And Guide System Filters

Visible-infrared control and guide system is one of controling measures extensive attention increasingly in terms of military.In order to meet the requirements of infrared optical instruments,a visible and infrared triple waveband filter film system was designed according to the theory of thin.Through the comparing with serveral kinds of the common materials in visible and infrared area, ZnS and YbF3are selected as the materials.On the substrate of Ge,coating with average reflectance91%at450-950nm while average transmittance86%at3.7-4.8μm and7.5-9.0μm,and eletron beam and ion assisted deposition technique is used in this process.More requirements are integrated into the films,and the structures of optical instruments can be simplified.The result of test shows that all the parameters meet the requirements.