CF Flanged Sapphire Viewports
High purity Sapphire viewports offer a hermetically-sealed lens with upgraded optical, mechanical, and corrosion properties across a wide spectrum. Innovacera’ Sapphire viewports are rated for both high vacuum(HV) and ultrahigh vacuum(UHV) applications.
The use of high purity sapphire and low expansion alloys allow these viewports to be repeatedly baked out at temperatures up to 350°C. The crystal orientation of our sapphire viewports is normal to the optical axis, also referred to as a 90° orientation. All viewports up to one-inch in diameter are made with UV grade sapphire.
| - | Materials |
| Flange | 304 Stainless Steel |
| Glass Substrate | Sapphire |
| Seal | Vacuum Brazed |
- Single-crystal Sapphire
- Positioning/direction: 0-90°
- Ultraviolet and regular grades
- Optically polished substrate faces
- UHV compatible construction
- High Temperature rated to 350°C
- Stainless steel / NiFe construction
- Custom Solutions By Customer Request
| Property | Value |
| Chemical Formula | Sapphire(99.99%Al2O3) |
| Mechanical | |
| Density | 3.97 gm/cc |
| Hardness | 22.5 GPa |
| Modulus of Elasticity | 470 GPa |
| Flexural Strength | 690 MPa |
| Compressive Strength | 2940 MPa |
| Poisson's Ratio | - |
| Fracture Toughness | - |
| Electrical | |
| Dielectric Strength | 48 ac V/mm |
| Dielectric Constant | 9.3 (@ 1 MHz) |
| Volume Resistivity | 10^14 ohm-cm |
| Dielectric Strength | 48 ac V/mm |
| Thermal | |
| Coefficient of Thermal Expansion | 5.3 x 10^-6/°C |
| Thermal Conductivity | 41 W/(m*K) |
| Specific Heat | 0.75 x10^3 J/(Kg*K) |
| Shock Resistance | - |
| Maximum Working Temperature | 1900 °C |
| Optical | |
| Index of Refraction | 1.762 |
| Birefringence | - |
| Transmission Band | - |
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