Wear Resistance Sapphire Wafer Sapphire Windows C-axis R-axis M-axis A-axis
Sapphire Windows are manufactured from single crystal sapphire, 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.
| Available orientations: | C-axis [0001], R-axis [1-102], A-axis [11-20], M-axis [10-10], Random |
| Sapphire windows / blanks | |
| Diameter / Width: | 25.0 - 250.0 mm |
| Tolerance: | Standard ± 2°, Special to ± 0.1° |
| Thickness: | Minimum 0.15, maximum 120.0 mm |
| Surface finish: | As cut, fine ground, lapped, polished s/d 80/50, 60/40, 40/20, 20/10, 10/5, according to the MIL-0-13830A |
| Ends / Edge quality: | Fine ground, 80/50 |
| "As-grown" sapphire tubes: | |
| Dimensions | Up to 50 mm inner diameter, 0,5 - 4,0 mm wall thickness, 300-600 mm tubes length |
| Orientation | C-axis in the length of the tube |
| Polished sapphire tubes: | Up to 50 mm inside diameter, 0,5 - 3,0 mm wall thickness, 80-350 mm tubes length |
| Ingots: | Diameter/Width 5-220 mm, Thickness/Length 25 – 125 mm |
| Surface quality | As-cut, Ends/Edge Quality Diamond cut |
| OPTICAL PROPERTIES of SAPPHIRE Al2O3 |
| Transmission Range | 0.17 to 5.5 microns |
| Refractive Index | 1.75449 (o) 1.74663 (e) at 1.06 microns |
| Reflection Loss | at 1.06 microns (2 surfaces) for o-ray - 11.7%; for e-ray - 14.2% |
| Index of Absorption | 0.3 x 10-3 cm-1 at 2.4 microns |
| dN/dT | 13.7 x 10-6 at 5.4 microns |
| dn/dm = 0 | 1.5 microns |
| PHYSICAL PROPERTIES of SAPPHIRE Al2O3 |
| Density | 3.97 g/cm3 |
| Melting Point | 2040 degrees C |
| Thermal Conductivity | 27.21 W/(m x K) at 300 K |
| Thermal Expansion | 5.6 x 10 -6 /K (parallel C-axis) & 5.0 (perpendicular C-axis) x 10 -6 /K |
| Hardness | Knoop 2000 kg/mm 2 with 2000g indenter |
| Specific Heat Capacity | 419 J/(kg x K) |
| Dielectric Constant | 11.5 (parallel C-axis) 9.4 (perpendicular C-axis) at 1MHz |
| Young's 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 | 275 MPa (40,000 psi) |
| Poisson Ratio | 0.25 |
Acceptance Check
1. The product is fragile. We have adequately packed it and labeled it fragile. We deliver through excellent domestic and international express companies to ensure transportation quality.
2. After receiving the goods, please handle with care and check whether the outer carton is in good condition. Carefully open the outer carton and check whether the packing boxes are in alignment. Take a picture before you take them out.
3. Please open the vacuum package in a clean room when the products are to be applied.
4. If the products are found damaged during courier, please take a picture or record a video immediately. DO NOT take the damaged products out of the packaging box! Contact us immediately and we will solve the problem well.
