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Silicon is a good IR material, it can be used from 1.2 to 7 microns, its peak transmission range is in 3-5 micron. Silicon can be used in some circumstances where weight is a concern as that the density of Silicon is similar to optical glass. Silicon material is widely used in security and military applications.

Transmission Range: 1200nm~7000nm

Thermal Expansion Coefficient: 2.55x10-6/K

Density: 2.33g/cm3

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