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sapphire optical lens, Al2O3 single crystal glass ,sapphire optical glass ingots, sapphire optical rods,sapphire optical stick,Al2O3 single crystal glass lens,optical glass ingots by sapphire ,sapphire optical rods
Sapphire physical property
Sapphire glass is manufactured from single crystal sapphire(Al2O3 ), making them ideal for demanding applications (such as laser systems) 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 diamonds and, because of their structural strength, sapphire windows can be made much thinner than other common dielectric windows with improved transmittance. Chemically, sapphire is single crystal aluminum oxide (Al2O3), and is useful in a transmission range from 0.2 - 5.5µm.
Why choose sapphire glass ?
1- Thinner and Stronger than Standard Glass Windows
2- Transmits Wavelengths Ranging From UV to Mid-Infrared
3- Features Extreme Surface Hardness and Chemical Resistance
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2. Comparison of optical window materials
Material Properties Applications
BK7
Transmission Range: 330-2100nm
Refractive Index: 1.5164@588nm Most popular and low cost Visible and near IR spectrum applications
Fused Silica
Transmission Range: 185-2500nm Low Thermal Expansion UV to IR spectrum
Refractive Index: 1.4858@308nm Coefficient: 0.54 x 10-6K Best choice for thermal resistance
Sapphire
Transmission Range: 180-4500nm Strong Hardness Best choice for scratch resistance applications
Refractive Index: 1.755@1000nm Thinner optics Wide Transmission Range
Calcium Fluoride
Transmission Range: 170-7800nm Little Hygroscopic Susceptibility IR laser applications
Coefficient: 18.85 x 10-6K High Thermal Expansion
Refractive Index: 1.399@5000nm
MgF2
Transmission Range: 120-7000nm UV laser applications
| Item | B270 | CaF2 | Ge | MgF2 | N-BK7 | Sapphire | Si | UV Fused Sillca | ZnSe | ZnS |
| Refractive index(nd) | 1.523 | 1.434 | 1.003 | 1.413 | 1.517 | 1.768 | 3.422 | 1.458 | 2.403 | 2.631 |
| Coeffcient of dispersion(Vd) | 58.5 | 95.1 | N/A | 106.2 | 64.2 | 72.2 | N/A | 67.7 | N/A | N/A |
| Density(g/cm3) | 2.55 | 3.18 | 5.33 | 3.18 | 2.46 | 3.97 | 2.33 | 2.20 | 5.27 | 5.27 |
| TCE(μm/m℃) | 8.2 | 18.85 | 6.1 | 13.7 | 7.1 | 5.3 | 2.55 | 0.55 | 7.1 | 7.6 |
| Soften Temperature(℃) | 533 | 800 | 936 | 1255 | 557 | 2000 | 1500 | 1000 | 250 | 1525 |
| Knoop hardness(kg/mm2) | 542 | 158.3 | 780 | 415 | 610 | 2200 | 1150 | 500 | 120 | 120 |
3. commen size for sapphire optical parts
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
4.0 sample small tube in details
5. We can supply professional customized service in time and provide cooperation
and support of new product development and technology appliance.
| Packaging | products → PET films or electro-static vinyl paper in cleaning room |
| Inner packing → Foam plastics anti-vibration cushion liner for package | |
| Outer packing → five layers corrugated carton paper box or as required | |
| Shipping | by air → UPS , DHL , Fedex , TNT, EMS ,SF ,etc |