The 20SW8-180 is a Sapphire Window, 50.80 mm in diameter and 2.00 mm thick. Sapphire windows are ideal for applications where high pressure, vacuum, or corrosive atmospheres are a consideration. The raw material has negligible lattice distortion and is oriented with the optical axis normal to the faces to minimize the inherent birefringent properties of single crystal sapphire.
| Model | 20SW8-180 |
|---|---|
| Material | Sapphire |
| Diameter | 2.0 in. (50.8 mm) |
| Thickness | 0.08 in. (2.0 mm) |
| Antireflection Coating | Uncoated |
| Surface Quality | 40-20 scratch-dig |
| Surface Accuracy | λ/4 @ 633 nm per inch |
| Clear Aperture | Central 80% of diameter |
| Parallelism | ≤3 arc min (≤0.9 mrad) arc sec |
| Diameter Tolerance | +0/-0.25 |
| Thermal Limit | 22 W m-1 K-1 |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol |
