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Sapphire Lenses

  • Extreme mechanical hardness and chemical immunities
  • Superb thermal and stress endurance
  • Wide Transmission Range: 0.25-5.5μm
  • Ideal for application from UV to MWIR
  • Various lenses: Ball/Half Ball, Plano-convex/concave, meniscus, etc.
  • AR coating available
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Lens Shape

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

Lenses are optical components utilized for focusing or diverging light. Sapphire Lenses are ideal for demanding applications (such as lasers) and harsh environments because of their extreme surface hardness, high thermal conduction, high dielectric constants, and resistance to common chemical acids and alkalis. Sapphire (Al2O3) 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. Sapphire has a good transmission at 0.15 to 5.5μm, which covers ultrthe a-violet (UV) to mid-wave infrared (MWIR) wavelength range.

Hangzhou Shalom EO offers Custom Sapphire Lenses upon the customer's request, and the lenses with anti-reflection and other thin film coatings are available. The precision, focal lens, lens shape (ball/half ball, plano-convex/concave, double-concave, meniscus, etc.), and other specification of the sapphire lens could be tailored. The sapphire we offer include Random, C-cut (also known as Z-cut), or other custom orientations. Our sapphire windows are excellent for incorporations into various multi-spetral and Infrared optical and laser facilities.