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Infrared optical systems usually use crystalline materials, such as ZnS, Si, GaAs, Ge, ZnSe, etc., and infrared lenses made of crystalline materials are usually expensive. As a new type of infrared lens material, chalcogenide glass is mainly composed of S, Se and Te of the VI main group, combined with As, Ge, P, Sb, Al, Si and other elements to form a glassy substance;
In addition, halogens can also be introduced to form sulfur halide glasses. This kind of glass has high transmittance in the medium-wave and long-wave infrared bands, and its transmission band can cover three atmospheric windows of 1~3um, 3~5um, and 8~12um.
Chalcogenide glass is obtained by melt quenching method, which has high production efficiency, short cycle time, low cost, and excellent temperature and viscosity characteristics. The processing efficiency is more than 10 times higher than that of diamond turning, which greatly reduces the manufacturing cost and processing cycle of the infrared optical system. The raw material cost is 1/3 of the germanium single crystal, which is an ideal material to replace the crystal.
Compared with traditional infrared materials, the temperature coefficient of refractive index of chalcogenide glass is smaller. For example, the temperature coefficient of refractive index of Gasir-1 is only 49.7×10−6/°C, which is only the temperature coefficient of refractive index of crystal Ge (the refraction temperature of crystal Ge The rate temperature coefficient is 1/8 of 3.96×10−4/°C).
Therefore, it plays an important role in thermal defocus adjustment and chromatic aberration correction of infrared thermal imaging system. In addition, chalcogenide glass has a low dispersion coefficient, so chalcogenide glass is usually considered in achromatic and athermal optical designs. The use of chalcogenide glass in optical systems is of great significance for simplifying the system structure, reducing weight, and reducing costs.
Infrared optical systems usually use crystalline materials, such as ZnS, Si, GaAs, Ge, ZnSe, etc., and infrared lenses made of crystalline materials are usually expensive. As a new type of infrared lens material, chalcogenide glass is mainly composed of S, Se and Te of the VI main group, combined with As, Ge, P, Sb, Al, Si and other elements to form a glassy substance;
In addition, halogens can also be introduced to form sulfur halide glasses. This kind of glass has high transmittance in the medium-wave and long-wave infrared bands, and its transmission band can cover three atmospheric windows of 1~3um, 3~5um, and 8~12um.
Chalcogenide glass is obtained by melt quenching method, which has high production efficiency, short cycle time, low cost, and excellent temperature and viscosity characteristics. The processing efficiency is more than 10 times higher than that of diamond turning, which greatly reduces the manufacturing cost and processing cycle of the infrared optical system. The raw material cost is 1/3 of the germanium single crystal, which is an ideal material to replace the crystal.
Compared with traditional infrared materials, the temperature coefficient of refractive index of chalcogenide glass is smaller. For example, the temperature coefficient of refractive index of Gasir-1 is only 49.7×10−6/°C, which is only the temperature coefficient of refractive index of crystal Ge (the refraction temperature of crystal Ge The rate temperature coefficient is 1/8 of 3.96×10−4/°C).
Therefore, it plays an important role in thermal defocus adjustment and chromatic aberration correction of infrared thermal imaging system. In addition, chalcogenide glass has a low dispersion coefficient, so chalcogenide glass is usually considered in achromatic and athermal optical designs. The use of chalcogenide glass in optical systems is of great significance for simplifying the system structure, reducing weight, and reducing costs.
