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Sapphire Ball Lenses and Half Ball Lenses

  • Diameter range from 0.5mm to 100mm
  • Large wavelength range: 0.15~5μm
  • Extreme hardness for harsh environment
  • Chemical and erosion resistant front surface
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Lens Type Ball lenses, half-ball lenses Materials Optical grade single crystal sapphire, ruby
Diameter Range 0.5mm~100mm Diameter Tolerance ±0.02mm
Surface Roughness 0.1μm Surface Quality Option: 80/50, 60/40, 40/20 or 20/10 S/D
Coating according to customer's requirement

Physical and Optical Properties:

Transmission Range 0.17-5.5μm Refractive Index No 1.75449; Ne 1.74663@1.06μm
Reflection Loss 14%@1.06μm Absorption Coefficient 0.3x10-3cm-1@2.4μm
Reststrahlen Peak 13.5μm dn/dT 13.1x10-6@0.546μm
dn/dμ=0 1.5μm Density 3.97g/cc
Melting Point 2040℃ Thermal Conductivity 27.21 W m-1 K-1 @300K
Thermal Expansion 5.6 (para)& 5.0(perp)x10-6/K* Hardness Knoop 2000 with 2000g indenter
Specific Heat Capacity 763 J Kg-1 K-1 @293K Dielectric Constant 11.5 (para) 9.4 (perp)@ 1MHz
Youngs Modules 335Gpa Shear Modules 148.1GPa
Bulk Modules 240GPa Elastic Coefficients C11=496 C12=164 C13=115 C33=498 C44=148
Apparent Elastic Limit 300 MPa (45000 Psi) Poisson Ratio 0.25
Solubility 98x10-6g/100g water Molecular Weight 101.96
Class/Sturcture Trigonal(hex), R3c

Sapphire and Ruby ball and half-ball (hemispherical) lenses feature a very short back focal length with the convenience of a flat surface for easy mounting. Sapphire features a high index of refraction and excellent broadband transmission characteristics. Ruby half-ball lenses are easier to see and therefore easier to handle for physical applications. The lenses are very chemically stable and are great for severe environments, high temperature applications, and applications requiring high melting points.

Hangzhou Shalom EO offers stocked and custom sapphire ball lenses and half ball lenses with diameter range of 0.5mm to 100mm, our ball lenses are widely used in applicatiions of fiber communication, endoscopy, microscopy, optical pick-up devices, and laser measurement systems.