Custom Optical Grade Sapphire Glass Lenses with Coating
Sapphire is one of the high quality infrared materials with excellent transmitting property across visible and mid-infrared waveband. It is the main substrate material for GaN LED.
Because of its high hardness, sapphire is also used as protective windows of watches and other precise mechanical devices.
Specifications
| Material | Sapphire crystal,fused silica and other optical material |
| Diameter | 0.2-300mm or customization |
| Diameter tolerance | +/-0.1mm or +/-0.02mm |
| Thickness | 0.10-100mm |
| Thickness tolerance | ± 0.1mm or +/-0.02mm |
| Surface quality (scratch & dig) | 60/40, 40/20 or better |
| Surface accuracy | λ/10, λ/2, λ |
| Clear Aperture | >85%, >90% |
| Parallelism | +/-3' ,+/-30'' |
| Bevel | 0.1~0.3mm×45 degree |
| coating | AR, BBAR or upon customer request( UV, VIS, IR) |
Features:excellent optical, physical and chemical properties. It has high hardness,high melting point, high transparency, high acids resistant.
Applications:Micro electrics, photoelectron, aviation&aerospace instrument, laster system.
Crystal sapphire possesses a unique combination of excellent optical, physical and chemical properties it is the hardest of the oxide crystals. sapphire retains its strength at high temperatures, has good thermal properties, excellent transparency and chemically resistant to common acids. These properties encourage its wide use in hostile environments where optical transmission in the range from the visible to the near infrared is required.
| Melting Point (℃) | 2040 |
| Density (g/cm3) | 3.98 |
| Hardness(knoop)(kg/mm2) | 9Mohs |
| | 1800 knoop, parallel to C-axis |
| 2200 knoop, perpendicular to C-axis |
| Youngs Modulus (Gpa) | 410 |
| Poisson's Ratio | 0.27 |
| Flexural Strength (Mpa) | 880 |
| Thermal Expansion Coefficient (10-6, K-1) | 6.7,parallel to C-axis, |
| | 5.0,perpendicular to C-axis |
| Thermal Conductivity (@300K,Wm-1.K-1) | 35,parallel to C-axis |
| | 33,perpendicular to C-axis |
| Heat Capacity (Cal/g.K) | 0.18 |
| Refractive Index (@0.58μm) | 1.769 |
| Dielectric Constant | 11.5,parallel to C-axis |
| | 9.4,perpendicular to C-axis |
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Custom Optical Grade Sapphire Glass Lenses with Coating Images
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