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Sapphire Domes

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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 3-5 mirco, it is suitable for multi-spectral and high-speed applications. Hangzhou Shalom EO provide the aerospace and defense industry with critical infrared, multi-spectral, and visible domes, and the domes used in missile and reconnaissance & surveillance applications. 
Good transmission from UV to Mid-Infrared 
Extreme Surface Hardness and Chemical Resistance


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

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