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Sapphire Domes


  • Good transmission from UV to Mid-Infrared
  • Excellent surface hardness and chemical Resistance
  • For defense, security and aerospace application

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Materials Optical grade sapphire crystals (Al2O3) Diameter Range 10~ 380mm
Thickness Tolerance +/-0.2mm (Optional:+/-0.1mm and +/-0.05mm) Surface Quality 60/40 to 40/20 S/D
Frings (N) customized Irregularity (delta N) customized
Chamfer 0.1~0.3mmx45degree

Physical and Optical Properties:

Transmission Range 0.17 to 5.5μm Refractive Index No 1.75449; Ne 1.74663 at 1.06μm (1)
Reflection Loss 14% at 1.06μm Absorption Coefficient 0.3 x 10-3 cm-1 at 2.4μm (2)
Reststrahlen Peak 13.5μm dn/dT 13.1 x 10-6 at 0.546μm (3)
dn/dμ = 0 1.5μm Density 3.97 g/cc
Melting Point 2040°C Thermal Conductivity 27.21 W m-1 K-1 at 300K
Thermal Expansion 5.6 (para) & 5.0 (perp) x 10-6 /K * Hardness Knoop 2000 with 2000gindenter
Specific Heat Capacity 763 J Kg-1 K-1 at 293K (4) Dielectric Constant 11.5 (para) 9.4 (perp) at 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 C44=148
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

Domes need both high transmission as well as durability, sapphire is a excellent selection for its good mechanical properties and good transmission from UV to MWIR of 3-5μm, it is suitable for multi-spectral and high-speed applications. Hangzhou Shalom EO provide the sapphire domes with wide wavelength from UV to MWIR, they are widely used in defense, security and aerospace applications.


1. Transmission of Sapphire at Infrared Wavelength Range (no coating)


2. Transmission of Sapphire at UV Wavelength Range ( no coating)