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Sapphire Domes

  • Diameter range from 10mm to 280mm
  • Excellent transmission from UV to MWIR
  • Exceptional surface hardness and chemical resistance
  • For defense 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
Fringes (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

Both high transmission, as well as reliable durabilities, are important for optical domes, Sapphire Domes are an excellent option for its good mechanical properties and good transmission from UV to MWIR of 3-5μm. The wide transmissive spectrum of sapphire domes makes them ideal for multi-spectral and high-speed usages. 

Hangzhou Shalom EO offers custom sapphire domes with wide wavelengths from UV to MWIR, the products are used in extensive for defense and aerospace applications.


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


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