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  • Sapphire Windows
  • Sapphire Windows

Sapphire Windows

  • Extreme surface hardness and chemical resistance
  • Maximum diameter 300mm
  • Broad wavelength range from UV to MWIR
  • AR coating available
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Windows Type 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 Option: 60/40, 40/20 or 20/10 S/D Parallelism 1 arc minute


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


Sapphire Windows are manufactured from single crystal sapphire, making them ideal for demanding applications (such as laser systems) because of their extreme surface hardness, high thermal conductivity, high dielectric constant and resistance to common chemical acids and alkalis. Sapphire is the second hardest crystal next to diamonds and, because of their structural strength, sapphire windows can be made much thinner than other common dielectric windows with improved transmittance. Sapphire has a good transmission at 0.15 to 5.5μm, which covers ultra-violet (UV) to midwave infrared (MWIR) wavelength range.

Hangzhou Shalom EO offers stocked and customized windows upon customer's request, and optional anti-reflection coating are available.


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
  • Transmission Range: Transmits wavelength ranging from 0.15 to 5.5μm
  • Suitable for application from UV to MWIR
  • AR coating available