Silicon - the lowest cost IR material 


Silicon is the main element construct the Earth's crust, synthetic monocrystalline silicon is the base for modern electronics industries, and perhaps the most affordable infrared materials. Silicon is commonly used as an optical window primarily in the 3-5μm band, and also could be used for 6-15μm transmission while the thickness become a very critical parameter of the silicon optics. Silicon is often employed as a substrate for laser mirrors because of its high thermal conductivity and low density.


Silicon is commonly grown by CZ method and contains some oxygen which causes strong absorption band at 9μm, limit its transmission applications in 8-12μm.


U-optics offer monocrystalline Silicon optical components with diameter from 3mm to 300mm, for thermal imaging and laser optics applications. Please contact our Sales & Support team to discuss your detailed request on Silicon optics.


Key Figures
  • The lowest cost among all IR materials.
  • Lowest density, ideal for weight sensitive applications.
  • High thermal conductivity.
  • Primarily used in 3-5μm MIR band.
  • Components dimension available up to 300mm.



U-Optics provides following optical components fabricated by monocrystalline silicon.
Ø  Windows
Ø  Filters for IR detectors
Ø  Beamsplitters
Ø  Mirrors
Ø  Prisms, Wedges
Ø  Spherical Lenses
Ø  Aspherical lens, Diffractive aspherical lens
Ø  Other customs optics



Ø  Dimensional Tolerance            +0.0/-0.1mm

Ø  Thickness Tolerance                 ±0.2mm

Ø  Center Thickness Tol.                ±0.2mm

Ø  Surface Quality                            10/5

Ø  Centering                                      3-5 arcminutes

Ø  Surface Accuracy                         1/10 λ @ 10.6μm

Ø  Parallelism                                   <1 acrminute

Ø  Clear Aperture                              90%