Request for a quote

Silicon window

AR and DLC coating on IR optics to enhance their transmission and strengthen their resistance.

Sinoptix Optical products with specifications : 3/ 2(2) rmst <50 nm, one face DLC and one face AR coating.

Category: IR & Laser, Optical components, Optical windows

Silicon is a recommended material for IR applications, see below its specifications:

Material name Silicon
Chemical formula Si
Index of Refraction 2.50
Transmission range 1.2µm to 7µm
Density 2.33 g/cm3
Hardness 1100 Knoop
Young’s modulus 130.9 GPa
Thermal expansion 2.6*10-6 °K-1
Thermal conductivity 163 W/(m*°K)
Melting point 1690 °K

Silicon windows are widely used for IR application, due to their good transmission of infrared wavelengths. Compare to other IR materials like CaF2 and MgF2 Silicon is not transparent in the visible range.

Main industries:

  • Defense
  • Security
  • Quality control
  • Communication
  • Transport