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  • Sapphire Windows
  • Sapphire Windows
  • Sapphire Windows
  • Sapphire Windows

Sapphire Windows

  • Exceptional mechanical strength and chemical resistance
  • High thermal durabilities excellent for harsh environments
  • Maximum diameter 300mm
  • Broad wavelength range from 150-5500nm
  • Blank substrates, AR-coated pieces, and precision windows are available

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Window Shape Circular, rectangular and other special shape windows Materials Optical grade single crystal sapphire
Aperture >90% Dimension Tolerance +0.0/-0.2mm
Thickness Tolerance +/-0.2mm Flatness customized
Surface Quality Optional: 60/40, 40/20 or 20/10 S/D Parallelism 30 arc sec
Coating Options No Coating, or Single Layer Coatings of MgF2 and Other Custom Options


Physical and optical properties:

Transmission Range 0.17 to 5.5 μm Refractive Index No 1.75449; Ne 1.74663 @ 1.06 μm
Reflection Loss 14% at 1.06 μm Absorption Coefficient 0.3 x 10-3 cm-1 @ 2.4 μm
Reststrahlen Peak 13.5 μm dn/dT 13.1 x 10-6  @ 0.546 μm
dn/dμ = 0 1.5 μm Density 3.97 g/cc
Melting Point 2040°C Thermal Conductivity 27.21 W m-1 K-1 @300K
Thermal Expansion 5.6 (para) & 5.0 (perp) x 10-6 /K * Hardness Knoop 2000 with 2000g indenter
Specific Heat Capacity 763 J Kg-1 K-1 @ 293K Dielectric Constant 11.5 (para) 9.4 (perp) @ 1MHz
Youngs Modulus (E) 335 GPa Shear Modulus (G) 148.1 GPa
Bulk Modulus (K) 240 GPa Elastic Coefficients C11=496 C12=164 C13=115 C33=498
Apparent Elastic Limit 300 MPa (45,000 psi) Poisson Ratio 0.25
Solubility 98 x 10-6 g/100g water Molecular Weight 101.96
Class/Structure Trigonal (hex), R3c


Single Crystals Sapphire (Al2O3) Windows, featuring broad optical transmission from 150-5500nm spanning from UV to MWIR spectrum, and robust mechanical/thermal properties, are excellent for applications involving harsh and variant environments or requiring a broad transparent wavelength range (e.g. windows of sensors and detectors, IR applications, etc.). 

The most distinctive feature of the sapphire is its unrivaled mechanical strength, with a Knoop Hardness of 1800-2200, windows made from single crystals of sapphire are resistant in particular to scratches and chemical attacks of common acids and alkalis. Due to the firm internal covalent bonding of single crystal sapphire, sapphire windows could be fabricated into thin pieces without fracture, while exhibiting high thermal stabilities, owing to its high thermal conduction.

Shalom EO offers various forms of Optical Sapphire Windows including flat windows with parallel faces, rectangular windows, wedge windows, and other custom specifications. Large aperture sapphire windows with diameters up to 300mm are available, and surface qualities of 60/40, 40/20, 20/10, Scratch/Dig are optional according to the precision requirements of your interest. Conventionally our sapphire windows are z-cut in order to prevent birefringence.

Shalom EO’s blank sapphire substrates are transparent in the wavelength range between 2.5-4.5µm with an average transmission rate above 85%. Single film MgF2 coatings and other AR coatings could be furnished to increase transmission. Precision sapphire windows requisite for laser are also procurable upon request. Additionally, Shalom EO provides a wide assortment of Optical Windows and Infrared Windows made from UVFS, NK7, Germanium, ZnSe, Silicon, etc.


Transmission of Sapphire Windows without Coating at UV to 1100nm

Transmission of Sapphire Windows without Coating at 2.5μm to 8.0μm

Sapphire Lenses

Sapphire Lenses

  • Extreme surface hardness and chemical resistance
  • Wide Transmission Range: 0.15-5.5μm
  • Ideal for application from UV to MWIR
  • AR coating available