New mid-infrared material and its radar stealth function

With the fast development of the infrared technology and electro-optical countermeasure technique,the infrared windows capable of radar stealth and Electro-Magnetic Shielding(EMS) are essentially required.A new kind of mid-infrared optical glass,oxy-fluoride gallate glass,namely IRG-05 was introduced.And a mid-infrared material,with the capacity of radar stealth based on IRG-05 substrate,was prepared successfully.Compared with the traditional material made infrared windows with periodical metal grid prepared on the surface by coating and lithography,the new radar stealth mid-infrared optical material had higher transmission in the 3-5 μm band as well as much more stable metal grid.The growing trends of the radar stealth IR-transparent materials were also discussed.IR composite materials with the capacity of Radar stealth and EMS,prepared by IR-crystal and IR-glass combination,were showing great potentiality.Metal grid induced by the super-high-power ultrafast laser in the IR-glass is another promising approach.