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Sapphire Lenses


  • Large wavelength range: 0.15~5μm
  • Extreme hardness for harsh environment
  • Chemical and erosion resistant front surface
  • Large strength for thin lenses

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Lens Type

Plano-convex, Plano-concave,

Double convex, Meniscus lenses

Materials Optical grade single crystal sapphire
Aperture >90% Diameter Tolerance +0.0/-0.2mm
Thickness Tolerance +/-0.2mm Centering Error 3 arc minutes
Surface Quality Option: 60/40, 40/20 or 20/10 S/D Parallelism 1 arc minute
Coating According to customer’s requirement


Basic Properties:

Physical and Optical Properties
Transmission Range 0.17 to 5.5 μm Refractive Index No 1.75449; Ne 1.74663 @ 1.06 μm (1)
Reflection Loss 14% at 1.06 μm Absorption Coefficient 0.3 x 10-3cm-1 @ 2.4 μm (2)
Reststrahlen Peak 13.5 μm dn/dT 13.1 x 10-6  @ 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 @ 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 (4) 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 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

Single crystal sapphire lenses are ideal for demanding applications (such as laser systems) and harsh environments 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 diamond and, because of their structural strength, sapphire crystal lenses can be made much thinner than other common materials. Chemically, sapphire is single crystal aluminum oxide (Al2O3) and is useful in a transmission range from 0.15 to 5.5μm.
Hangzhou Shalom EO offers the custom lenses upon customer’s request, and the lenses with anti-reflection and other thin film coatings are available.