Sapphire Ball Lenses and Half Ball Lenses
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. Typical applications include fiber communication, endoscopy, microscopy, optical pick-up devices, and laser measurement systems.
- Large wavelength range: 0.15~5μm
- Extreme hardness for harsh environment
- Chemical and erosion resistant front surface
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Specifications
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Lens Type
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Ball lenses, half-ball lenses
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Materials
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Optical grade single crystal sapphire, ruby
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Diameter range
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0.5mm ~100mm
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Diameter tolerance
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±0.02mm
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Surface roughness
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0.1μm
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Surface Quality
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Option: 80/50,60/40, 40/20 or 20/10 S/D
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Coating
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According to customer’s requirement
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Physical and optical properties
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Transmission Range
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0.17 to 5.5 μm
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Refractive Index
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No 1.75449; Ne 1.74663 at 1.06 μm (1)
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Reflection Loss
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14% at 1.06 μm
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Absorption Coefficient
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0.3 x 10-3 cm-1 at 2.4 μm (2)
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Reststrahlen Peak
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13.5 μm
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dn/dT
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13.1 x 10-6 at 0.546 μm (3)
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dn/dμ = 0
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1.5 μm
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Density
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3.97 g/cc
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Melting Point
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2040°C
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Thermal Conductivity
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27.21 W m-1 K-1 at 300K
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Thermal Expansion
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5.6 (para) & 5.0 (perp) x 10-6/K *
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Hardness
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Knoop 2000 with 2000g indenter
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Specific Heat Capacity
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763 J Kg-1 K-1 at 293K (4)
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Dielectric Constant
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11.5 (para) 9.4 (perp) at 1MHz
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Youngs Modulus (E)
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335 GPa
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Shear Modulus (G)
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148.1 GPa
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Bulk Modulus (K)
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240 GPa
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Elastic Coefficients
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C11=496 C12=164 C13=115 C33=498 C44=148
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Apparent Elastic Limit
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300 MPa (45,000 psi)
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Poisson Ratio
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0.25
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Solubility
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98 x 10-6 g/100g water
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Molecular Weight
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101.96
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Class/Structure
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Trigonal (hex), R3c
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