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  • Sapphire Lenses and Balls
  • Sapphire Lenses and Balls
  • Sapphire Lenses and Balls
  • Sapphire Lenses and Balls
  • Sapphire Lenses and Balls
  • Sapphire Lenses and Balls

Sapphire Lenses and Balls

  • 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
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Materials Optical grade sapphire crystals Diameter Range ~300mm
Diameter Tolerance +0.0/-0.2mm Thickness Tolerance +/-0.2mm
Surface Quality 60/40 S/D Frings (N) 3
Irregularity (delta N) 1 Centration 3'
Chamfer 0.1-0.3mmx45 degree

Physical and Optical Properties:

Transmission Range 0.17 to 5.5 μm Refractive Index No 1.75449; Ne 1.74663 at 1.06 μm (1)
Reflection Loss 14% at 1.06 μm Absorption Coefficient 0.3 x 10-3 cm-1 at 2.4 μm(2)
Reststrahlen Peak 13.5 μm dn/dT 13.1 x 10-6 at 0.546 μm(3)
dn/dμ = 0 1.5 μm 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

Chemically, sapphire is single crystal or aluminum oxide (Al2O3) is used in transmission range from 0.2 - 5.5μm, sapphire is suitable for MWIR 3-5μmthermal imaging applications. Sapphire lenses are made from single crystal sapphire, they are ideal for demanding applications 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. Hangzhou Shalom EO provide the customized lenses and balls upon customer's request.


1. Transmission of Sapphire at Infrared wavelength range (no coating)

2. Transmission of Sapphire at UV wavelength range ( no coating)